Looking for a new motor for my rotrex'd VVT swapped 90. I was on the hunt for a bp4w as they are around here in Florida and a lot of the guys recommend them. Searching the threads, it's recommend for the slightly lower compression for rotrex boost.

There's also a couple VVTs, including an imported low miles JDM motor. Days of searching I'm getting conflicting info that the JDM BPZE/BP6D is 10.5:1 and the USDM is 10 1. Can anyone confirm or deny?

If I'm strictly 93 pump gas, is 10:1 compression fine for 230ish whp for track, autox, street car? If the JDM is 10.5:1, is that safe or getting out of hand?

Thanks.

 

I have a set of JDM VVT pistons.
Can confirm they are 10.5.

 

The 10.5 motor won't be any weaker. Just may require a different tune. It can safely do 230whp just as well as the 10:1 motor can.

I wouldn't pay extra for one. I wouldn't pay less for one, either.

 

Thanks, did you order them or found used?

 

It's already a pretty good deal AND comes with a square top and warranty for $999.

 

rotrex doesn't make torque. you're totally fine with the higher compression

 

Sounds like a no-brainer.

 

Thanks for the input guys.

 

Can you please post pictures of the pistons? I purchased a JDM motor a while back and I would like know if this motor has the same pistons as yours.

 

This is what my broken 10.5:1 JDM pistons looked like.

 

That looks a lot like a standard VVT piston.

 

Stock USDM 01-05 pistons do not have that third step-up in the center.

 

Brought the pictures up on an actual computer with a real screen not an iPhone and I see the difference now. Thanks.

 

Just leaving these here for who ever is interested.

 

/\ very helpful, thanks

 

Yes, very helpful!

Placed the order for the JDM VVT with square top motor yesterday, hopefully it's not ****.

 

Interesting that they dropped the dome away from the spark plug in the center of the 10.5:1 slug.

 

Those are great photographs, thankyou.