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To make a long story short, I recently bought back the 62 I sold to a friend last year. It had some overheating problems in the past that were addressed in the usual manner and it was pretty much under control. While my friend had the car, he removed the dual point distributor and installed a single point with vacuum advance. The car runs great,with much better idle and low end performance. Additionally the temperature has not climbed over 180 even on the hottest days. So I put the dual point up on the shelf. I notice however it is idling at 1000rpm and there is a very slight hestitation when starting from a stop. Any suggestions as to settings for best perfomance with this distributor and the original cam and solids?
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Re: C2-62 340hp tune up specs
The idle speed should be easily adjustable, and 850-900 is probably a good idle speed. The vacuum can signal line should be routed to a full manifold vacuum source. Also, what are the numbers on the vacuum can bracket. There is only one vacuum can that is properly matched to the Duntov cam.
The hesitation could possibly be improved by richening the idle mixture. When vacuum advance was added to the 340 HP engine in '63 the carb was recalibrated, but depending on your starting technique and axle ratio, a seemless start from a dead stop is not always possible with SHP engines.
Duke -
Re: C2-62 340hp tune up specs
Rob:
Duke or John H. will be able to fix you up here. I'll try to get you started. First of all, what kind of vac can is on the distributor? The best one to run is the 236 can, used on the 1964 and later engines. Obviously, since you are not concerned with originality, then NAPA/Eichin makes a similar unit at a much lower price. I am sorry, but I don't have the NAPA part number.
Set the distributor to 12* initial timing, with the weights tied, or removed. Set your idle to about 800-850 RPM. On the later distributors, the cent advance begins at about 600 RPM, and tops out at 24* @ 2350 RPM. The vac advance should be fully deployed at idle. The specs, with the 236 can are: 0* @ 4"-hg ; 16.5* @ 8.2"-hg. Use a dial back timing light or degree your harmonic balancer to check your timing "curve". Good luck.
JoeComment
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Re: C2-62 340hp tune up specs
Duke, the numbers on the vaccum can bracket are "437" as best I can make out. The car has a 3.70 rear. I will adjust the idle and try richening the mixture a bit to address the hesitation. I believe he got the distributor from "The Rev" last summer. Thanks for your advice.Comment
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Re: C2-62 340hp tune up specs
I can't ID the vacuum can, but it is probably not the best one to use. Joe listed the best specs for the distributor, which were OEM for '64 and '65 SHP/FI engines. The correct NAPA/Echlin can to replace the Delco 236 is VC1810.
You should determine the advance map. A dial back timing light is very handy to quickly characterize it. You want about 24 degrees total centrifugal in as quickly as possible without detonation with initial in the range of 10-14. The vacuum can should begin to pull at 4" and provide 16 degrees at 8".
There are a zillion distributor calibrations out there. You need to know how yours is calibrated, then bring is as close to 64/65 SHP/FI specs as possible.
If it still has the ID band on the base with the distributor part number we should be able to determine the original calibration.
DukeComment
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Re: C2-62 340hp tune up specs
Duke. I checked the distributor and there is not a band still on it. I asked my friend, and he said he got it from Dale Pearman last year. Dale told him that he used it on his 62 fuelly and it was fine for the 340hp as well. I can use the specs you and Joe posted and see what happens. It is possible that it was never set up correctly. If that is not satisfactory I replace the can with a "236"Comment
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Re: C2-62 340hp tune up specs
Joe,thanks for all your imput. Between you and Duke I am sure I have enough information to fix the problem.Comment
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