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#1
03-08-2007, 10:54 PM
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Stock Compression Ratio for the '02 4.0L?
Anybody know the stock compression ration for the '02 4.0L? I'm looking at some cams the recommend 8.75 - 10.5:1. Anybody raised their compression? Thanks
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'98 Eclipse RS ENGINE: Twin Ceramic Ball Bearing T3/T4 with ceramic blades (20G for sale!), FMIC, 3'' Intercooler Piping and Down Pipe, Dump after Down Pipe, Walbro 255 FP, 450cc 4G63 Injectors, Greddy E-Manage, TurboXS DSBC (4/7psi for now). SUSPENSION: Sustec Front and Rear Lower Tie Bars, Suspension Techniques Front and Rear Sway Bars, DC Sports Front and Rear Upper Strut Tower Bars, Eibach Pro Kit Springs, KYB AGX Adjustable Struts, Polyurethane Bushings Everywhere. 
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#2
08-19-2007, 07:34 AM
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Re: Stock Compression Ratio for the '02 4.0L?
Well, I finally searched Google for a bit and got the answer. The stock 4.0L is 8.8:1. ...So now I know that I'll have to shim the head or get a thicker gasket to offset the 9.0:1 compression pistons that come with the stroker kit I'm looking at... Otherwise, the forced induction is going to be an issue.
__________________
'98 Eclipse RS ENGINE: Twin Ceramic Ball Bearing T3/T4 with ceramic blades (20G for sale!), FMIC, 3'' Intercooler Piping and Down Pipe, Dump after Down Pipe, Walbro 255 FP, 450cc 4G63 Injectors, Greddy E-Manage, TurboXS DSBC (4/7psi for now). SUSPENSION: Sustec Front and Rear Lower Tie Bars, Suspension Techniques Front and Rear Sway Bars, DC Sports Front and Rear Upper Strut Tower Bars, Eibach Pro Kit Springs, KYB AGX Adjustable Struts, Polyurethane Bushings Everywhere.
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