I was reading up on the new toyota engine and it ways it has the same bore and stroke as our model engine. so its pistons which are 12.5:1 compression should fit in our motor am i not correct?

 

eh.....maybe. But it would be better to just get aftermarket pistons

 

As cool as that would be I usually associate those three letter to some type of flex fuel set up in which case the high compression ratio would make sense. If you want high compression why not go with a good after market brand?

 

well the highest they make are 11.0:1 and right now i'm looking into doing basic bolt ons and when i have most of those i'm planning on going nitrous.

 

your motor on nitrous = BOOM !!!

 

i hope not i only plan on running a 50 shot


... at least until i have "Forged" internals

 

I guarantee if you speak to the companies direct they will make you some 12.5:1 pistons if that is what you want. Don't just go off of website call them and ask the only difference will be is cost. You will definitely pay a lot more for ones that are custom made vs off the shelf. You will need a solid engine management running that high compression if not a standalone.

 

i bet that same motor has a electric water pump, electric power steering and electric a/c compressor in the new prius

 

yea but just because the compression ratio is 12.5:1 for the 2az-fxe does not mean that the pistons are performance quality...much less that they can handle nitrous. O and btw if you want to have more than 11:1 compression ratio and THEN run nitrous....have fun blowing your motor in like 10k miles

 

Not true any significant mod you do will stand a chance of blowing your engine i.e. higher compression pistons, turbo,and etc. If you have a standalone and have it professionally tuned for this you can do this without issue. You will always have to run premium and changes are they will have to pull a little timing.

 

im prolly going to have a friend of mine be tuning it but for now i'm going all motor. then when im built ill put a shot of nos on it.

 

Is your friend an experienced tuner? If he is not then that would not be a good idea also if you go through with it do not push it at all until tuned by professional.

 

yes he is. He wants me to get a piggy-back ecu but i forgot what type it was called. He recently made 290 whp and 250 wtq on his celica GTS with a supercharger at 10 PSI.

 

The FXE engines toyota makes with those high compression pistons are Atkinson cycle engines for hybrids.

http://en.wikipedia.org/wiki/Toyota_AZ_engine#2AZ-FXE

 

And if you want to run nitrous, you're better off sticking with stock-ish compression. It's similar to the same reasons why turbo guys fare better with lower compression... you're cramming more air/fuel in artificially, achieving higher cylinder pressures that way. Adding a second mechanism adds another variable.

It will be a lot more lenient to tune, and you can potentially run a bigger shot of nitrous.

 

the new Toyota 4 cylinder is the 1AR.. the 2AZ-FXE is in the Camry Hybrid. so you got your information wrong..