PDF from NCRS - NCRS-RMC
Contents
1. event registration along with a cash bar for socializing In attendance this year representing The Rocky Mountain Chapter was J ohn Hilborn Dave Talley and Early Friday morning found myself up for a continental breakfast provided by NCRS and then onto the classrooms for a full day of study of the Chevrolet Corvette Classes were from 7AM till 6PM with breaks and lunch time Friday evening was free time and the three of us RMC members and my girlfriend Rosie who just happens to live in Dallas left the Hilton for a fine steak dinner at a nearby restaurant Saturday morning up again early for the continental breakfast again provide by our host NCRS Then onto our open forum of judging the invited NCRS cars in the Convention Center Hall Many great Corvettes in this hall from a 57 to several midyears to two 69 L88 s and a 71 LS6 was assigned to a McLellan Award Car a 75 L82 convertible The day had breaks as well as a lunch time Teams of two judged every section of your assigned car with usually the NCRS National Team Leader There was much role playing between judges and the car owners along with the many mentors who were also NCRS Master J udges themselves Again evening was open for activities with new and old friends The next day was up early checked out of my hotel and headed to DFW Airport and my American Airlines flight back home to Denver It was another great weekend of Great Cars amp Great Frien2. from rolling out on time The debut of the 1971 Camaro line was also delayed but insiders report this was the result of body panel tooling problems A few speculate that 1970 Corvette introduction was intentionally delayed to gain as much time as possible to understand the impact of California s newly adopted emissions laws After all Corvette was the performance flagship of the fleet with California buyers representing roughly 10 of sales But without supporting fact from behind closed management doors this is simply speculation When the summer of 1970 arrived all Chevrolet cars and trucks were ready to debut their new 1971 models The traditional model year change over period was accomplished by all vehicles including Corvette GM vowed the 1971 models were READY to burn lead free gasoline when it came on stream Significant design changes had been made for emission compliance The new federal emissions standards were achieved with changes in basically three areas 1 The vapor recovery system used on 70 California cars was extended to all cars 2 Engine compression ratios were lowered 3 A new system called Combined Emissions Control CEC went into production Consumers poorly understood the CEC system then and it s not clearly understood by owners restorers today That s the focus of this article What is the CEC system and how does one properly restore a 1971 Corvette to make the system functi
3. run I ll come to it Rocky Mountain Corvette Ltd Work Limited to Corvettes D J Kazmierzak Owner Operator P O Box 787 Phone 303 748 8235 Indian Hills CO 80 e mail Dennis J K wispertel net e mail DJKazmierzak NCRSRMC org Ad 3 01 06 1979 Chevrolet Corvette VIN 1Z8789S432563 White with Red Leather Interior 350ci Auto A C PS PB PW AM FM Stereo w 8 Track Aluminum Wheels and Cruise All original excellent condition very well maintained 53k documented miles Owner history back to original date of purchase including Dealer Invoice 12 900 Peter Gregory 303 805 2936 PMGregoryl aol com Ad 1 01 06 For Sale 1978 corvette silver Ann 4 speed L 48 engine black interior 35 000 miles Firm 22 500 Martin Egan at 307 632 5806 or e mail _martinegan6 aol com_ mailto martinegan6 aol com Ad 11 01 05 1999 C5 Corvette convertible 6 speed Magnetic Red saddle leather interior tan top Z51 12 CD remote changer HUD sport bucket seats dual zone temp control good rubber much more Excellent condition Call Ralph 303 660 8531 Asking 32 500 00 Ad 11 01 05 Two Goodyear Eagle GSC unidirectional tires 25540ZR17 Very good tread remaining 80 for the pair Bill Barcus 303 773 2633 Ad 11 01 05 1962 Corvette matching number Maroon with Black interior engine transmission amp rear axle rebuilt Good paint and interior Third owner 250hp 327 with 4 speed serial 13307 45 000
4. solenoids the reversing relay GM 3990842 was smart making it a miniature pre programmed computer that decided when to fire the CEC solenoid The other control relay GM 3990843 was a delay device It served to override the reversing relay and fire the CEC solenoid for a fixed period each time the engine was started After the fixed time interval about 15 seconds the relay self latched removing it from the circuit and relinquishing control to the reversing The Rocky Mountain Chapter NCRS relay until it was reset when the car stopped and the ignition was turned off The reversing relay received inputs through the wiring harness from two other points One input was a switch mounted on the transmission manual or automatic telling the relay when the vehicle was operating in high gear s The other input was a thermal switch mounted in the RH cylinder head This switch had three positions to report engine temperature 1 engine is cold and not yet up to normal operating temperature 2 engine is within normal operating temperature range and 3 engine is above normal operating temperature overheating is a threat How Does CEC Work The concepts underlying the CEC system were pretty simple First lowering an engine s compression ratio reduces the amount of blow by leaking around the piston rings and into the crankcase that form sulfated hydrocarbons Also you generate fewer exotic combustion byprodu
5. C4 manual has pictures but they must be viewed as typical production not the absolute final word A judge needs to observe many cars from different areas of the country and record trends for accurate interpretation The Rocky Mountain Chapter NCRS 8 n n j H pY hia om Eon oY a de gt eB gt i SA a A FENN d mas sa There is an enhanced literature package with C4s which may include a tape or CD tire gauge Rolex knock off watch no kidding etc as well as the owner s manual Buy your own judging manual and take notes There are extensive items to check in the OPS CHECK Programming the radio playing a CD or tape and optional seats that have air inflated lumbar supports are just a few of the items discussed For example when having your car judged in Texas bring country music CD for the Ops Check The word here is BE FAMILIAR with the car as much as possible Don t forget to register for the meet NOW See you there Dennis Dalton ED newsletterRMC earthlink net The Rocky Mountain Chapter NCRS Judging Retreat Recap The 2006 NCRS J udging Retreat was held again February 9 13 at the Hilton DFW Lakes Executive Conference Center in Grapevine Texas My arrival on Thursday afternoon was mostly checking into my hotel for the weekend and seeing friends again from last year s Judging Retreat and past NCRS Chapter and Regional Events At 7PM a room was opened for
6. Call Martin Eagan at 307 632 5806 CORVETTESCORVETTESCORVETTES We now have a new black z06 in stock Also have a new 2005 red convertible acouple of 06 vettes in stock and a red low miliage 2002 covertable Mike Rowland Bosarth Chevrolet 303 775 2448 rowland54 yahoo com Advertisers At our last meeting it was decided to leave ads in for 3 issues 6 months All ads will now have a date Please relist ads if you still want them listed and I will date them ED ROCKY MOUNTAIN CHAPTER OFFICERS CHAIRMAN RockyMntnRidge aol com Term expires 12 31 2006 VICE CHAIRMAN DJKazmierak NCRSRMC org Term expires 12 31 2007 EDITOR Dennis Dalton newsletterRMC earthlink net 719 583 2565 Term expires 12 31 2007 JUDGING CHAIRMAN jim lennartz us Term expires 12 31 2007 CHAPTER LIAISON Kjbell92 msn com Appointed position SECRETARY RReiff rwbeck com Term expires 12 31 2006 Ralph Ridge 303 660 8531 Dennis Kazmierzak 303 697 8428 Jim Lennartz 303 674 0295 Kevin Bell 719 495 3551 Rick Reiff 303 766 2654 The Rocky Mountain Chapter NCRS TREASURER stevebeatty attbi com Term expires 12 31 2006 ACTIVITIES pmgregory aol com Term expires 12 31 2007 MERCHANDISE pearwill comcast net Term expires 12 31 2006 MEMBERSHIP milehiview yahoo com Term expires 12 31 2006 TECHNICAL ADVISOR CorvetteMasters cs com Appointed Position COMMUNICATIONS rdav ncrsrmc org Appointed position Steve Be
7. Great food and camaraderie was enjoyed by all who attended The gift exchange was quite exciting and entertaining Thanks to Lisa Racz Gaddis for her help in co coordinating the gift exchange As you can see this was a party of all parties Be apart of next year Rocky Mountain Chapter Holiday Party See you at the party next year The following is the next couple of month s events Please join us March 18 11AM RMC Annual Meeting Elections Corvette City April 2 9AM Bosarth Chevrolet Chapter J udging Meet Da Be i T J 3 1 w 2 Editors Notes By Dennis Dalton About 20 members braved the cold temperatures for the judging school at Corvette City Saturday January 18 Dennis Kasmierzak conducted the school on C4 cars for Jim Lenartz Jim left an excellent list of topics for Dennis and they can be viewed on the web site by clicking on JUDGING SCHOOL and then MORE INFO for the complete list Below is a recap of the topics covered If you have the blue C4 judging manual you need to request the yellow update sheets Make sure you turn in the green registration sheet before the meet In the future Dennis hopes to have the sheets filled out by computer before the meet Make sure the options list is present and in tact It can be found under the console door between the seats It is made of laminated paper glued in place and includes the vin all options and paint information The new
8. The Rocky Mountain Chapter NCRS REAN NATIONAL CORVETTE RESTORERS SOCIETY ROCKY MOUNTAIN CHAPTER ETKA AN ILLPA INSIDE THIS ISSUE CHAIRMANS MESSAGE 1 MEMBERSHIP 1 ACTIVITIES 2 EDITORS NOTES 3 JUDGING RETREAT RECAP 4 1971 CORVETTE EMISSIONS SYSTEM 4 MERCHANDISE 9 CLASSIFIED ADS 9 10 OFFICERS 10 CHAIRMANS MESSAGE By Ralph Ridge At our meeting in January the membership expressed a desire to pursue sponsoring another NCRS Regional judging meet to be held in 2008 To that end several members of your board held a special meeting to organize a proposal Due to time constraints we decided to submit a proposal for the meet to be held in Breckenridge since most of the legwork has already been accomplished for that venue The proposal was submitted to NCRS National for consideration We won t know if we are successful in our bid until after the National Board meeting in San Antonio on March 25th Another item discussed at the J anuary meeting was whether or not the Rocky Mountain Chapter would be interested in submitting a proposal to sponsor a National Convention in our region in 2011 It was decided that this would be an appropriate subject for discussion at our annual meeting on Issue 15 amp 16 March 18 Due to the impact this decision will have on the entire membership encourage you to attend this meeting Another important reason for attending the March meeting is the election of officers A ballot has be
9. atty 303 523 9517 Peter Gregory 303 805 2936 Bill Pearson 303 652 3185 Bob Montgomery 303 734 4649 Gary Steffens 303 762 8388 Bob Davis 303 838 9529 Membership in the NCRS is open to persons interested in the restoration preservation and history of the Corvette produced by the Chevrolet Motor Division of General Motors Corporation from 1953 through 1982 NCRS is not affiliated with Chevrolet or General Motors Membership in the Rocky Mountain Chapter of the NCRS is open to all members of the NCRS National organization Dues are 30 00 for the first year and are 20 00 per year for renewal First year dues entitle the new member to a Chapter ball cap and membership nametag Advertising in the Rocky Mountain Chapter Newsletter is free to all active members for all Corvette related items or Corvettes for sale Commercial advertising rates for the Newsletter are 15 00 for a business card 25 00 for a 1 4 page 40 00 for a page and 60 00 for a full page All rates are quoted for 6 issues or one year printing Contact the editor for further information All editorial material can be sent to the editor NCRS registered marks used in this publication are NCRS Founders Award NCRS Master Judge Award NCRS Performance Verification Award NCRS Flight Award and NCRS Sportsman Award and are registered with the United States Department of Commerce and Trademark Office The NCRS American Heritag
10. connect Wow What s a restorer to do What the heck did dealership mechanics do How can you properly service and maintain a vehicle if the supporting documentation is incorrect and incomplete The Recovery Path had a devil of a time getting my 1971 Corvette back to its as delivered configuration and function I m an electrical engineer and spent hours days in reverse engineering mode disassembling parts and trying to reconstruct how the system originally worked to restore it properly finally got there with some backdoor help discovered what looks like a case of dumping The 1971 CEC components continued in use through 1972 but they were only incorporated on 6 cylinder Chevrolet engines However the 1972 version of the CSM did provide troubleshooting charts for the CEC and used those to get my 1971 Corvette up and running Later uncovered other GM Chevy documents that fill in the blanks and shed more light At various swap meets uncovered a full set of 1971 Chevrolet Service News flyers also found a Chevrolet Communication pamphlet CC 70 10 11 titled 1971 Chevrolet Emission Control Systems that s a pocket sized booklet intended to brief readers on the CEC Also obtained two KEY publications 1 Chevrolet Motor Division 1971 New Product Information NPI 4 71 and 2 Chevrolet Motor Division 1971 Combined Emissions Control System Training Program Booklet NPI 5 71 These
11. cts NOX CO ash lead Etc that would normally be a part of tail pipe emissions The big tradeoff for a cleaner burn from a lower compression ratio is engine power loss Next when cruising the freeway and approaching an exit the driver lets off on the accelerator to slow down It s the absolute change in engine RPM and carburetor throttle angle that dictate the amount of unburned hydrocarbons sucked from the intake manifold that go out the tail pipe With a modest increase in engine RPM over normal curb idle made ONLY when the car is in high gear another aspect of emissions HC is reduced In city driving vehicles spend a healthy amount of time idling stop signs traffic lights Etc There you want a low idle RPM and retarded timing to reduce tail pipe emissions So the CEC solenoid is de energized and vacuum to the distributor s advance mechanism is cutoff This lets engine RPM fall as low as possible with a cleaner burning spark profile When the transmission is in low gear s it usually means the driver is accelerating to get up to cruising speed In this case spark timing is dominated by the distributor s centrifugal advance mechanism That means there s really no need for the distributor s vacuum advance to be active The philosophy is valid unless you re cruising in low gear for an extended period like in a parade You only really need the distributor s vacuum advance to be active when you re at steady hig
12. ds My special thanks to my co members from RMC for joining me my instructors Marvin and J oan Burnett National Team Leader 73 77 and Master J udges J ohn Burkheister Mentor and Master J udge Tony the 75 Corvette owner and the many speakers Roy Sinor National J udging Chairman for directing such a great Retreat Oh my girlfriend Rosie for hauling us around and putting up with me talking about Corvettes ALL weekend Peter M Gregory National Corvette Restorers Society Rocky Mountain Chapter Activities Chairman NCRS 4157 PMGregory1 aol com 1971 Corvette Emissions System NCRS Driveline Article Submitted By Jack Humphrey Founder s Award Requirement Date 20 February 2005 In prior years automobile pollution had become an issue of public awareness California had succeeded from the union by adopting its own state law requiring 1970 model year cars to meet a California specific emissions profile In Washington lawmakers had been working for several years to establish a uniform 50 State emission standard The legislation targeted 1971 model year cars for compliance In the 1970 model year the 1969 Corvette saw its production extended by year with 1970 Corvettes not shipping until after January 1 1970 Some say this introduction delay was a result of a 1969 strike at GM but that s doubtful the strike didn t affect any other 1970 The Rocky Mountain Chapter NCRS Chevrolet models
13. e AwardS application is pending
14. en sent out to all members and encourage you send in your proxy if you can t attend the meeting in person Lastly but equally important is the fact that our Chapter J udging meet is only a few weeks away on Sunday April 2 at Bozarth Chevrolet on Havana Street If you haven t registered yet please do so now We need everyone there to help judge and everyone MUST register If you re not bringing a car for judging consider entering it in Sportsman If nothing else it ll get you a priority parking spot SAVE THE WAVE Ralph MEMBERSHIP By Bob Montgomery This winter in Colorado has been very mild It has been a tossup for me to either drive my Corvette or to get some of those winter projects out of the way have managed to do a little of both The 2006 membership drive has completed and have processed 108 renewals and 4 new memberships as of February 13 2006 Total membership stands at 112 members The newest members are Earl Raymond of Keenesburg CO with his 1967 427 435 coupe Lon Lemaster located in Mosman New South Wales Australia Lon was introduced to the Chapter by Eckhard Pobuda Dean Stevinson of Centennial CO with his 1967 427 435 roadster have published the 2006 NCRS RMC Membership directory as well as printing the 2006 membership cards All members that had paid 2006 dues by January 31 2006 are included in the directory The directory and membership cards will be availab
15. gh the radiator to boost engine cooling The Rocky Mountain Chapter NCRS On paper the CEC system was a brilliant solution to a plurality of driving conditions and demands Why was it a 1 year only feature Why is it hard to understand restore The Documentation Opps If you own a 1971 Corvette you might have studied the engine portion of the wiring diagram With any degree of due diligence you ll find it s WRONG Further study will lead you to conclude that what Chevrolet put in print is basically the 1970 engine wiring diagram without information to support the CEC electrical components that actually shipped on 1971 cars Further AIM pages showing the emissions components appear helter skelter UPC Section 12 Electrical shows 1970 Transmission Controlled Spark TCS components still on the engine and being wired up The CEC control relays are called out in UPC Section 7 Transmission but the drawing is still labeled TCS versus CEC This tells me the CEC system was a last minute engineering breakthrough that was rushed to production without all supporting drawings having been properly revised to match Last while there is a section in the Chassis Service Manual CSM covering theory of operation for the CEC system there is no tutorial on troubleshooting to support it And the engine wiring diagrams for all 1971 Chevrolet cars in the CSM are incorrect as they fail to document the CEC wiring inter
16. hat went hand in glove with the 1970 to 1971 model year change They butchered these cars in a futile effort to recoup the performance profile of earlier 1969 70 Corvettes and vented their frustrations on the obviously new CEC components beneath the hood Ridiculous The CEC was only a window dress item the real cause for loss of power was the engine with it s reduced compression ratio Further think this is the reason CEC was a 1 year only system for Chevrolet V8 engines The 1972 system essentially worked the same way as the 1 year only CEC However it returned to a discrete TCS solenoid mounted on the RH side of the intake manifold pass block vacuum to the distributor and it used a non vacuum controlling idle solenoid on the carburetor that simply increased or decreased curb idle The standalone vacuum solenoid WAS part of the 1970 TCS system and these were the last of the high performance high compression ratio V8 engines for Corvette It looks to me like the 1971 CEC system was an EXCELLENT design that provided cost reduction by combining two separate solenoid functions into a single component but its timing to market was poor released in tandem with the engine s drop in compression ratio and CEC feature functions weren t well explained The Rocky Mountain Chapter NCRS Conclusion There s nothing wrong with having a functional CEC system on your 1971 Corvette It doesn t rob power or performance Howeve
17. hway cruising speeds So the CEC solenoid kills two birds with one stone It gives a more optimum burn profile during engine idle doesn t sacrifice low gear acceleration restores vacuum controlled spark advance for high gear highway cruising and reduces unburned HC emissions during high gear compression braking Once designers had the basic control mechanism in place the CEC solenoid they elaborated on its functionality with a few more bells and whistles provided by the control relays First the CEC solenoid fires to boost idle RPM and feed the distributor s vacuum advance for a fixed interval set by the Delay Relay This was done to promote warm engine start initial drivability Second the Reversing Relay is fed engine temperature information from the temperature switch mounted in the RH cylinder head So long as the engine is below normal operating temperature fire the CEC solenoid to speed the engine warm up process and avoid sluggish cold engine performance When the engine is in normal thermal equilibrium release the CEC solenoid and let it be controlled by the transmission switch alone Last grid lock was becoming an urban routine Long periods of idle in hot summer traffic queues tax the cooling system especially when A C equipped The coolant switch was given a third position engine above normal temperature range to fire the CEC solenoid again modestly increase RPM and pull more air throu
18. le at chapter functions beginning in February Be sure to get your copy Notice Here is a correction for the membership directory that missed before it went to the printer Steve Beatty s email address is stingraycpoa hotmail com How cool is that for an email address The 2006 annual meeting and elections are scheduled for March 18 at Corvette City emailed the ballot to as many members as possible Ballots will also be available at the annual meeting Bob Montgomery milehiview yahoo com Turbo Jata are death to Cobras The Rocky Mountain Chapter NCRS ACTIVITIES By Peter M Gregory The Holiday Party on January 7 2006 was a great success With approximately thirty two members signed in and their spouses or guests attending making a grand total of approximately sixty to sixty five people attending The party was hosted by members Jan and Mike Bogan of Erie CO The beautiful home had a great garage area along with a living room area which was great for having our Rocky Mountain Chapter Board Meeting prior to the party Also two classic Corvettes were found to be inside the garage One being the hosts own 63 Fuelie roadster and the other a guest Corvette a 57 Fuelie Another surprise awaited us inside the attached airplane hangar to the house was again the hosts own 1960 Cessna 182 aircraft that had undergone extensive restoration and enhancements A beautiful piece of aviation history
19. on Combined Emissions Control System The heart of the CEC system is a unique solenoid that was mounted on a_ bracket attached to the carburetor The CEC solenoid GM 1114444 was unique because it provided two functions First the solenoid had a plunger shaft that would extend or contract based on electrical input In its energized state the solenoid s shaft extended to contact the carburetor s throttle and INCREASE idle RPM This gave engines two curb idle settings dictated by the CEC solenoid Second the solenoid had an internal vacuum passage When the solenoid was energized the solenoid s two vacuum nipples were joined causing vacuum into the solenoid to be routed out of the solenoid When the solenoid was not energized the passageway between the two vacuum nipples was blocked to deny vacuum to advance spark timing So the CEC solenoid preformed two tasks at once toggle curb idle RPM and pass or block vacuum Figure 1 from the 1971 Chevrolet Chassis Service Manual CSM gives a system overview IDLE POSITION CLEAN AIR FILTER CARBURETOR wie sr THROTTLE LEVER me ee ee asad YOMITION SWITCH 0 Q sd 2 l P gt gt ENERGIZEO S i k o ae REVERSING RELAY TME DELAY LAY s PPROX TIS SE TRANSMISSION SWITCH CLOSED IN LOW GEARS The CEC solenoid was controlled by a pair of relays mounted on the engine compartment firewall directly in front of the driver One of these
20. publications constitute the Rosetta Stone for 1971 Corvette owners wanting to restore and troubleshoot their CEC system Both give in depth hands on details of the CEC system with enough information for one skilled in the art to troubleshoot More important the first book supplements the CSM by giving the missing troubleshooting charts Figures 2 and 3 provide that data TROUBLE SHOOTING GUIDE COMPU HIGH GEA The Rocky Mountain Chapter NCRS TROUBLE SHOOTING GUIDE COMPLAINT ESSIVE CREEP AT IDLE AT But the sleeping giant awoke in the May 1971 issue of Chevrolet Service News It contained a full set of corrected engine wiring diagrams for each 1971 Chevrolet passenger car including Corvette to remedy the incorrect information in the 1971 Chassis Service Manual Figure 4 is the corrected engine wiring diagram for your Corvette Page 12 CHEVROLET SERVICE NEWS May 1971 The Debacle In my experience ve yet to see a truly un molested unrestored 1971 Corvette from the standpoint of its factory installed CEC emission system being intact I ve seen numerous approaches by prior owners mechanics to castrate the CEC system including key component removal and wholesale butchery of the engine wiring harness My gut tells me these hack jobs were done by people unfamiliar with the CEC system who were frustrated by the car s loss of power t
21. r if your car has been castrated then you ll probably need the information given here to properly restore it Do me one favor though Please don t call with trivia questions Questions like Where do find this that component of the CEC system or ask me to troubleshoot your car for you All of the information you need is here when considered with whats in the Assembly Instruction Manual AIM and the Chassis Service Manual CSM Jack Humphrey NCRS 1700 25381 Ridge Way Golden CO 80401 303 526 9410 J ackHumphreyH comcast net MERCHANDISE By Bill Pearson MERCHANDISE IN STOCK ITEM PRICE Golf Caps Red White Gray Maroon 11 00 Natural Green and Natural Blue T Shirts Silk screen Front amp Back 10 00 Sweatshirts Silk screen Front amp Back 20 00 Short Sleeved Polo White Red Blue amp 30 00 Gray RMC Embroidered Long Sleeved Polo Dark Gray amp Blue 35 00 RMC Embroidered Light Weight Polo Short Sleeved Teal 20 00 Shop Coats Gray RMC Embroidered 35 00 Chambray Shirt RMC Embroidered 30 00 RMC Embroidered Jacket special order 50 00 Steamboat Hat Pins 1 00 RMC Hat Pins 3 00 Name Tags 5 00 VISIT OUR WEB SITE at WWW NCRSRMC ORG Specializing in 63 67 Corvette Repairs Mechanical amp Electrical Recommendations for Body amp Paint repairs All work by appointment House calls on request If it doesn t
Download Pdf Manuals
Related Search