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Old 05-30-08, 11:37 PM   #33 (permalink)
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Big-Foot
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Join Date: Jan 2007
Location: Minneapolis, MN
GT40: RCR40 - #45
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Re: Big-Foot's RCR-40 Build Thread - "SuperCar"

Here they are guys...

Yes - I know that we could have been just a tad leaner, but we didn't know what the 180 exhaust would do and we're still not done as the Valve springs and pushrods will most likely be replaced. Also - We did not have the right idle jets or correctors with us. The 120 Idle holder would not accept the smaller size idle jets that came in the kit.

Final Jetting / Air Correction was;

F7 Emulsion tube, 145 Main Jet, 120 Air Corrector, 120 Idle Holder, 70 Idle Jet


It was interesting that this engine does not like a lot of timing. The power started dropping off at 31 degrees and a lot more at 32 degrees. No detonation present or noted. The fuel used was 92 Octane pump gas. 3.5 PSI fuel pressure.





Still some tuning to be done...
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Regards - Randy
GT40 RCR40 #45 G50-331-Weber IDAs
My build site: http://www.GT-Forty.com
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