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View Full Version : re grind or billett???


leesaunders1981
27-06-2010, 11:44
New poster! (less than 10 posts)

im after a piper 285 camshaft, i can get a re grind one for £150 and a billett one for £200 plus vat, which one shall i go for...... is it worth saving £85 pound and going for the re grind???? is there really much difference????
Sparkie
27-06-2010, 11:52
get billet, the cam lobe surface is less harsh on the cam followers due to the angles involved, due to more meat being on the cam.
also the parkerising of the metal surface may not be that great on the regrind.
Andrew Cooke
29-06-2010, 08:12
That won't be a billet, that'll be ground onto a new standard blank.
leesaunders1981
29-06-2010, 09:39
Why wont it be a billett?? i spoke direct to piper and they assured me it was?? or are they having me on??? cheers.
Trevhib
29-06-2010, 10:30
Won't the standard blank have come from a billet initially Andy? Or are standard blanks forged/cast rather than machined?

Lee, 'billet' simply refers to the solid, high-quality bar of metal from which, by machining, parts are cut away until you are left with your desired shape, such as a crank/cam for example. It's a more expensive method than casting or forging but the quality is usually higher.

See the lower part of this article: http://en.wikipedia.org/wiki/Crankshaft

Mark/Andy, please correct as appropriate.
Andrew Cooke
29-06-2010, 13:09
Why wont it be a billett?? i spoke direct to piper and they assured me it was?? or are they having me on??? cheers.

I'd ask them again to confirm that it's a billet, and not just a new blank, last time I asked they wanted ~£500 to do a billet.
Trevhib
29-06-2010, 13:28
Andy, for my own knowledge, how does a blank differ from a billet over and above having already been made generally camshaft shaped ready for profiles to be cut?
Andrew Cooke
29-06-2010, 13:32
Andy, for my own knowledge, how does a blank differ from a billet over and above having already been made generally camshaft shaped ready for profiles to be cut?

it's as per the link you posted :)
Trevhib
29-06-2010, 22:23
:agree:
leesaunders1981
30-06-2010, 20:14
went for the billett!
Andrew Cooke
30-06-2010, 20:34
went for the billett!

cool.

they don't list a billet, just a blank for £199+VAT

http://www.pipercams.co.uk/pipercams/www/product.php?pid=R5TBP285