Quote:
Originally Posted by seningen
Eric,
Never thought otherwise -- basically having a beer discussion over the net :-)
I'm building a pair of SP-1s, so arguably my question is mute to me. However I do track a Boxster S and I have either rebuilt or been a part of about a dozen rebuilds of these engines and I was trying to envision how the HPs could vary.
Note I'm a EE and shade tree mechanic hack not a professional engine builder -- so this is more of a thought exercise for me.
Mike
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Thanks, I wasn't referring to you at all. It's a good question and anyone that has built an engine would know that cylinder head servicing is part of it. You can't rebuild a head to exact stock originally delivered specs and still successfully service it. Replacing cylinder heads with new every time adds another $8k to an engine rebuild and a terrible idea for cost controlled spec racing. Porsche dealership service departments and factory re manufactured engine program all service heads in similar ways within certain tolerances. Even if you ordered a rebuilt crate 2.5L engine from Porsche, the cylinder head has been serviced. Order up a rebuilt cylinder head from Porsche and that has also been serviced. Unfortunately, those tolerances are not really public info or written in our rule books so there is no guidance as to what acceptable "stock" range actually is. So when I said, "I have not seen limitations", that's what I meant. Not "there are none so it's wide open for porting and polishing and ceramic coatings and flow bench testing." As you can see, some spec classes do have a handle on such things, and Boxster Spec is not one of them.