Prius Pistons

[JustDidIt]

Originally Posted by xnamerxx

I can almost guarantee you, you'd be doing more harm then good by swapping to otto cycle cams in your engine. The prius is mainly powered by the electric engine, so to make that as efficient as possible the torque output on the gas engine needs remain a constant. The numbers I listed were WAG and so probably not accurate. Remember your gas engine isn't directly connected to the wheels, so its RPM's are also not a contant

Here is a website that explains how the HSD powersplit device works. Website

Upping the power on the gas engine doesn't help as much as you'd think since only torque at certain rpms provides assist. Since the engine only revs to 5k you'll be throwing away all the constant torque of the fxe to gain the peak torque of the fe all with major loss and no benefits. You have to think of the gas engine as a electricity generator/backup power unit rather than a PU. You can rev the nuts off the Prius engine and the car won't move unless the electric motor is moving.

TRD did it... with the Otto swap..

Originally Posted by JustDidIt

.....Motor transplant shouldn't be difficult and was done by the Bonneville Landspeed Prius. They swapped the Otto Cycle 1NZ-FE from an Toyota Echo in but didn't do the Prius pistons swap. I'm looking to do both.

Originally Posted by xnamerxx

You can rev the nuts off the Prius engine and the car won't move unless the electric motor is moving.

Not completely true...when the battery doesn't have enough juice to run the MG2, u can feel ONLY the gas engine struggling to push/pull the car along. With the battery charged enough from the regenerative braking from MG1, MG2 kicks in to assist the gas motor also boosting the inverter from 220v up to 500v.