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Big cams alone are not the answer (archive)

[ Follow Ups ] [ E30 M3 Message Board ] [ Msg. Board FAQ ]

Posted by ///M on February 21, 2002 at 22:48:46:

In Reply to: I want power, and I'm willing to rev! posted by jr. johnson on February 21, 2002 at 20:49:41:

That much duration will increase overlap which in turn lowers your dynamic compression. You have to add high compression pistons at the same time (say 12.5:1+) else you will not get the power you are hoping for and you will just lose torque. If you want to use that much cam you will have to build a complete motor to match the cam and that begins your path down the slippery slope of $$$.

Your big head is a good start for 21? RWHP, but it has to have the proper match of other parts to do it. Chip, header, 48mm TB, AFM, Injectors and 284/276 Schricks properly assembled is a proven way to make good power. See Gustave’s web site for good documentation on how to do it (

Also note that the evo3 intake cam is no slouch. I managed 214 rwhp with a similar head., Evo3 intake cam TB, AFM, ‘real’ custom race chip. Sure the Schricks were better but… well… that was many engine revisions ago.

If you want to get into big dog territory (235+ RWHP, 280-300 flywheel) I recommend you pay an expert like a Ron Checca. A person can easily spend more money experimenting and still never get there because it takes a lot more than just a list of part numbers to accomplish those numbers.

Good Luck

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