Prius Pistons

[JustDidIt]

Originally Posted by Viperoni

The (static) CR would be 13:1 if you use Prius (FXE) pistons.
The dynamic CR is apparently 11:1 if you use FXE pistons.
I was under the impression that the FE & FXE cranks were the same... or at least the stroke is. Maybe the FXE crank is stronger somehow?

Crankshaft:
1NZ-FE: 13401-21020
1NZ-FXE: 13401-21040

Difference No idea...

Originally Posted by Viperoni

To answer your question, it depends. A quick googling seems to say that there's diminishing returns, especially since you're not improving the breathing of the motor and filling the combustion chamber with more air/fuel.
One calculator said 6.5% and that's more or less what I read on another site as well... which I think is a bit low, but could be bang on. In any case, a 6.5% increase is 7hp.

If possible, I'd go with an overbore Prius piston to help increase displacement at the same time as increasing the CR... that'll help engine breathing, and it'll increase the quench area inside the combustion chamber which should help stop some detonation too.

So what if I was to modify the induction system..different routed intake and intake manifold (been looking over making my own intake manifold after watching 'tooters' adventures...and exhaust manifold and exhaust system? I would think this would help some...right?