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I don't have any plans for this combo, but I am just looking for opinions. What about a 4.8 crank in a 6.0 block for an everyday driver twin turbo RCSB 2WD. You would have a 4 inch bore to let the heads breathe and a 3.270 inch stroke for a little better fuel economy. After all 99% of the time you are not in boost. I know it would be down a little on torque while out of boost, but the turbos would take care of that while in boost.
the smaller stroke wouldn't equate to any kind of better fuel economy. The lsx heads flow plenty well to not NEED a 4" bore however they do work damn good with one. Really it wouldn't be worth the lost power since you can build one with a 3.622" stroke, get the same gas mileage, turn the same rpm, and make more power.
It'd be one high RPM bastard.
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Originally Posted by Hit Man X
how do you figure it would spin any higher than a 3.622" crank motor? A motor with the small stroke would make its power at higher RPM, but would not be capable of more rpm than a 3.622" crank motor. Now, make it a lighter, stronger shorter crank and yes, you will effectively raise the RPM capability of the motor/crank, however when comparing two stock cranks, one being shorter than the other it brings no new or higher RPM into the equation, just less power.
Has to rev to make its power.
every motor has to rev to make its power. why rev more than necessary to make power, less power at that.
The good thing about a high reving engine is that that it extends your shift MPH points. If you can make the same amount of power and extend your shifts you reduce your ET simply by not having to change gears. Its tougher to find a camshaft with a really broad power band though and the springs will be hammered to death running 7000rpm+.