should i rebuild
 

ok i am trying to build up a TII to 400+ hp. The car i am buying is out of state so i had it compression checked at a dealership up there. The compression numbers were 8.1 8.1 8.1 for rotor 1 and 9.3 9.3 9.3 for rotor 2. my gut instinct is that i should rebuild but i figured id check and see what everyone has to say

Each face of the rotor made exactly the same compression number as the others? Seems suspect to me...

I'd say it's even more suspicious since it appears to be a big difference between the two rotors. But if you're shooting for over 400hp you might as well do it right, the limit of the TII engine is somewhere around 500 if I remember correctly.

ok, as far as being suspect, the compression numbers were tested at a real mazda dealership. the mailed me their report, and those are the numbers i wrote out. secondly, 500hp is not the limit for a TII. yes they eat crap if you have knock issues but im pretty sure i saw a couple 550hp TIIs in the single turbo section that were not runnitn 13bres. Thanks for the input though

I would say just rebuild it and do it right. because to achieve 400-500hp you need more than a bigger / upgraded turbo, fuel, and engine management. And on stock ports i think your kinda choking the engine @ that point. mine as redo it and port it at the same time.

If those compression readings are correct, rotor # 2 is at 132 on all faces that is pretty outstanding. Sounds like this engine has been recently rebuilt using new housings. To achieve your HP goal, the engine really should be ported, otherwise the stock engine ports become the restriction. It is always nice to start a project knowing exactly the condition of all your engine internals.

However it does not sound like the engine needs to be rebuilt right away, unless you are planning a ground up build.

Yeah, but to see each face of a rotor produce exactly the same number is more then a little suspect. Any engine is going to have mechanical variation and show different numbers per each rotor face. Brand new, old, doesn't matter. :)

Well there was that one guy that got readings from the dealer saying it had like 150 - 170 lbs, perhaps machine error?