Silber’s 2002 Boxster S Engine Build

[Silber]

I hate to open the valve discussion again, but found new information.

HP Calculator Using Intake Valve Size

This calculates maximum theoretical horsepower of a well optimized engine given valve size.

According to their calculator, two 37.1mm intake valves, which is what the m96.21 3.2 has, on a 6 cyl is capable of flowing up to 430hp. That is a ceiling I can happily live with, not really even sure what to expect peak HP wise, but we will find out when it hits the dyno eventually.

I think the MAF and Throttle body are the biggest bottlenecks on the intake side, so will address those. After that the Boxster intake is the next weak link, but the 996 intake has some compromises so I’ll build with the Boxster S part, and retune later with a 996 intake if I’m not happy with the results on the Boxster part. Exhaust I’m as optimized as I’m going to get with equal length headers, high flow cats, and a free flowing muffler.

Regards,

Silber

[Gilles]

Silver, perhaps Len Hoffman can answer the questions you have regarding mixing and matching as his company has a very solid reputation building and repairing Porsche heads, Len is a gentleman and would be happy to explain the options you may have with your engine, he works closely with Charles at LN

This may be an interesting read for you, https://newsite.hamheads.com/porsche/
.

[Silber]

Originally Posted by Gilles

Silver, perhaps Len Hoffman can answer the questions you have…
…This may be an interesting read for you, https://newsite.hamheads.com/porsche/
.

Thing is I don’t have the budget for head work now so I’m building it with the heads I have. Head work isn’t cheap. If I’m not happy with the results I can always come back later and do something more extensive if I want. So I guess at this time I don’t really have any questions.

I have read that page a few times, it’s very good.

Regards,

Silber

[azlvr]

Originally Posted by Silber

Thing is I don’t have the budget for head work now so I’m building it with the heads I have. Head work isn’t cheap. If I’m not happy with the results I can always come back later and do something more extensive if I want. So I guess at this time I don’t really have any questions.

I have read that page a few times, it’s very good.

Regards,

Silber

Your heads will be fine like several others have already done. I plan on doing the same.