Hi all,

After some terrible leakdown results: https://www.s2ki.com/forums/s2000-un.../#post24649492

I'm now investigating rebuild options for my 06 AP2.

My intentions are to track this car 5-10 times/yr, supercharged at 450whp or so, on 93 pump. It's currently around 400whp SOS stage 2, all supporting mods.

Are there better options than a used stock motor? Are there reliable builders that can rebuild my current block with stronger components than OEM and give similar reliability?

If so, please share! Thank you!

 

Its clear your issue appears to be the cylinder bores (leakdown air escaping from dipstick). While it is possible to overbore these motors and fit larger pistons, you can only go a very miniscule amount, as the FRM coating is very thin. Typically if there are real issues with the bore, its already out of round too far or scratches too deep for overbore to work.

So another option that is very popular with high boost applications is to resleeve the block with iron liners. This will make things much stronger. The downside is the motor won't go 400k+ miles without a rebuild like the stock motor is capable of.

This seems like a good fit for your application. Especially if you aren't going to rack up miles like a dd..

You'll need to do your research. You'll need different pistons for the iron liners. But once this is done, future rebuilds are much more like a 'normal' motor. Which is a good thing, since rebuilds will need to be done more often than with FRM (not that this is so horrible, it'll still last as long as any other more traditional motor would).