This topic is interesting, so I decided to look into it a little. I found an interesting site that explains how rod length affects piston acceleration. http://e30m3performance.com/tech_articles/engine-tech/rod-ratio/index.htm Threre's even a spreadsheet you can download to calculate the piston acceleration for different rod lengths and strokes.

The bad news is that destroking a 2.4L motor with a 2.0L crank simply does NOT change the acceleration by that much. First of all, the rod would be .7" longer. I suppose you could squeeze another .3" if you really tried, so I ran the simulations with a 1" longer rod. What I came up with is that the pistons accelerate just as fast in a 2.0 motor at 8000 RPM as they do in the 2.4L hybrid motor at 8140 RPM. Blackdog is running a built 2.0L block to 9500 RPM. That's pretty high. Even still - the pistons in a 2.4L hybrid motor would have the same piston acceleration at 9670 RPM.

Essentially - you can't run any hybrid destroked 2.4 block up to 12000 RPM...unless you can rev a similarly prepped(bottom end wise) 2.0L to 11800 RPM. Pistons/Rods can only accelerate so fast before they become terminal and fly off. It's a nice thought and all, but I think 12,000 RPM is just way off. Also, this "2.4L hybrid motor" has a 2.0L displacement - 2.0L stroke with a 2.4L bore...which is the same as the 2.0L bore. I'd trade off a couple hundred rpm for an additional .4L any day.


95 Eclipse RS : 5 speed
15.901 @ 88.34mph
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html