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turbobrat930 turbobrat930 is offline
E-85 sippin drunk
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Join Date: Jan 2002
Location: Warner Robins, GA
Posts: 1,506
Originally Posted by HotRod View Post
Also, this is a street car, can I go with the 8:1 CR and still use pump gas (93 octane)?
greg, I dont think I would go with 8:1 C/R with CIS... Others might disagree. The highest I would go with CIS is 7.5:1 There is just too thin of a line with your AFR's when retaining CIS to push the C/R level much past 7.5:1

With these air cooled motors, we cant cool the heads and cylinders as well as the water cooled bretheren. I am running 8:1 C/R and thats with full EFI, and will be only running .8 bar most of the time and 1.0 bar at the MAX...ever!!! I have too much money wrapped up into my motor to chance getting a few extra HP at the expense of engine life.

Run the 8:1 C/R pistons if you want with CIS, but I would be very weary of detonation and lean conditions.....

BTW, very good choice on JB Racing... a bunch of great, honest guys to work with!!
Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-35RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 11-23-2008, 12:45 PM
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