Posted by Zane Any M30 crank will work in any M30 block, the only issue being piston pin height and compression. In your case, the selection of parts will be based on your overall power goal. Rod ratio is an important often overlooked performance recipe, just like cam selection or turbo selection. Most M30 blocks, stock, can handle great power with ease. An M90 block, unless your power goal is so great, would be a design option. Solid blocks omit flex, which is an important sealing point with turbos. Cam selection depends on you power goals, too. In general, a stock cam is better for forced induction. Believe it or not, overlap can be a good factor with the higher HP motors. There is a phenomena known as 'crossover', a dimond in the mist for a turbo motor. In any case, you can advance the cam, run higher clearances on the exhaust and lower on the intack--makes for a good combination with power delivery. The main thing which most overlook, too, is the ignition timimg; getting this correct will allow the motor to stay together. With our current pump gas, you have to retard the timing under boost. Your slope will be opposite a naturally aspirated slope. From there, you will concentrate on head sealing, bolt selection, ect...so there is a chain of events to follow if you want to have a reliable turbocharged motor, the key word here being the word "reliable".
on 11/27/2003, 7:17 am, in reply to "633 turbo"
12.78.0.76
Hi Bob,
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