An e-mail From Doug Nicholas - Page 8 - Polaris Riders
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post #71 of 72 (permalink) Old 03-20-2008, 06:20 PM
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I wouldn't say it was your fault. something has got to get sorted out and like we said it might be the cams.

on a totally different build on the other end of the country Tparsley has a 636 that was professionally designed with the best of the best stuff. A 636 stroker ported and designed on a flow bench with a specil cam grind and it does not make huge numbers. It makes good torque but it will not rev like it should. these engines are very odd at times and it is not hard to get some things mixed up to where the engine does not get what it needs at the time. it seems like the issue always does some how relate to the air flow of the head but the cams are closely related to I think.

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post #72 of 72 (permalink) Old 03-20-2008, 06:29 PM
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that can be a problem when you commit to a build by said builder but as SPH said he has doubt about the $2500 head. what does he do if that didn't work. it is quite expensive. to hand build the predator by doug is between $5000 and $9000. I don't have that kind of cash.
I spent $950 on my nic cycle trail ported head and dropped valves the day after it came off the dyno. I don't blame him, I put it together so it's my problem but I did dyno it before and the trail port was not money well spent for me but It just shows you can't go half way you have to go all or none.
the engine can still be fast and it can still be built by someone else.

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