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k20z3 in 2008 Si - hit list for 10,000 rpm

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50K views 43 replies 12 participants last post by  mucter  
M
#1 ·
So I've read/searched a lot for info on high-revving all motor builds. Seems there's a lot of info about the k20a2, but nothing definitive about the k20z3.

Now that FlashPro is coming out, that really opens the engine building options for the Si. I'd like to go all motor on my Si and make power up to about 10k. I do not want to go k24/k20, I want to rev, not have low end torque.

I know that on the k20a2 the oil pump is a problem due to cavitation. Is this an issue with the z3's oil pump? If so, will the S2000 oil pump fit on the z3 engine?

I assume that rods/cams are a must for revving to 10k safely. I was looking at the BP Stage 3 cams/valvetrain, but its unclear if they'll make power all the way up to 10k. I don't want a Stage 2 setup, as those seem to run out of breath right before 9k.

Anyone got some useful info on any of this?
 
M
#44 ·
In all seriousness. I guess what I'm going to do is wait till FlashPro finally comes out, then I'll probably look at buying a k24a4 from you and then price out custom pistons/rods/cams vs. just doing a standard k24 build and make a decision on all this then.

Thanks for your patience with me and the information. I at least now have a better understanding of what I'm looking at to make this a reality.

Right now all my money's going into getting some bolt ons on this car, as its been my wife's daily driver for the last year and its basically stock except for an AEM CAI. I have a Vibrant race header on the way, and I'm going to get the new RRC intake manifold for it as soon as hmotorsonline has them back in stock. I'm going to focus on getting the engine ready to breathe... going to need to open it up to pump more air whether I go standard k24 or 10k rpm anyways. I'm hoping that the Vibrant will be a good enough header to start out with, then I need to find a good exhaust that isn't violently loud. When I get the header, I'm going to measure the ID of the collector to make sure that I get an exhaust w/the same ID. Its supposedly 2.5", but we'll see about that.
 
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