Quote:
Originally Posted by NARFALICIOUS
There doesn't seem to be that much space between the cylinders to square off the bore. If I recall, the MK4 can be bored to around 87 or 88mm. Lets say you can bore the B58 by 2mm.... still far off. Would the de-stroke it just to have a higher RPM ?
This video is great btw I watched the whole thing. Loved the 2JZ teardown and rebuild and the hatch build too.
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I’m no expert on how to maximize rpms or power, but turbo motors are load dependent, so long gears and high rpms seem like a plus. A long stroke is good for torque, but, as the rpms increase, the piston speeds get so fast that the flame front is chasing the piston, so torque drops off at the top of the rev range. Looking at high revving motors like BMW’s S65 (8400rpm redline), the stroke was only 75mm with a bore of 92mm, so over square design, which allowed for the high redline. The 2JZ not only had wicked top end power, but it pulled so hard to redline, which felt amazing. Where other motors seem to be dropping off in torque, the 2JZ wanted to give more. I don’t know if the redline was underrated. For the B58, I bet they wanted a shorter engine, even if it is an inch, and they wanted more stroke for faster spool.