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jon379
PostPosted: Fri Mar 25, 2011 5:23 pm 
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hi hope some one can give me a bit of advice have got a set of piper cams in my head the heads been rebuilt with 1mm oversize inlet and exhaust valves ,fully ported,polished ,engle valve springs but now i need to shim the valves but a bit unsure what clearance to give std valve clearance is, inl 0.15/0.25mm and exh 0.28/0.38 mm but only info i can find on piper website is 0.20/0.25mm but doesnt specify if thats for for both cams between .20/.25 or inlet .20 exh .25 if any 1 has these fitted any help appreciated this http://www.pipercams.co.uk/pipercams/ww ... OYSGBP285T
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Sunny
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PostPosted: Fri Mar 25, 2011 6:05 pm 
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Hi,

when i build my head i used the toyota clearance and i think they must be used

hope it helps :)

greetz

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MrDB
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PostPosted: Sat Mar 26, 2011 10:06 am 
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Yes stock clearances .
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Muddy Water
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PostPosted: Sat Mar 26, 2011 10:44 pm 
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The clearance remains the same it's the duration that is different, that is, the higher lift cams have the effect that the valves are open for a longer duration.

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Kris
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PostPosted: Sat Mar 26, 2011 11:16 pm 
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If your running Toyota valves, why would you want to run different to the Toyota clearances?

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jon379
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PostPosted: Sun Mar 27, 2011 1:48 pm 
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hi its running ferrera 1mm oversize valves i was setting up all clearances to toyota spec then happened to notice pipers spec so eas curious if anyone else fitted piper cams and what clearance did they do
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Kris
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PostPosted: Sun Mar 27, 2011 11:23 pm 
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Maybe the best people to ask would be Ferrea?

I guess only Ferrea would probably know how much their valve stems grow by as they warm up? Unless someone else has measured it?

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Sunny
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PostPosted: Mon Mar 28, 2011 4:34 pm 
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Hi,

i think ferrea uses the oem clearance but if you ask i'am glad to let me know what they said :)

greetz

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