Quote Originally Posted by Richy View Post
Hello Ravi , I like your engine except for the crankshaft , the stroke is just out of proportion to the bore , more like a tractor engine , the connecting rod angle is too much . 3.0 SC engines have the same stroke and things are back in proportion .
Porsche made the 2.4 liter to compensate for detuning the 2.2 for emission requirements , detuning that was antiquated by todays knowledge and standards such as lowering the C R . Your engine redline may be 7,200 but it will not easily go there . The 2.4 is basically a smog dog , but bore and stroke became better proportioned with the 2.7 liter engine . Porsche tested several 2.5 liter engines for the ST ,one with 66mm stroke and one with 70.4 stroke ,
the 66mm stroke was used . or 68mm I think .
Thanks Rich for your feedback. I appreciate your wisdom and experience. At least, you can’t critique my brake, fuel, heating systems since you are the one restoring/reinstalling them on my 71 sports purpose build.