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#1
23-01-2010, 23:06
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sorry, i want to flog the cam and head complete really, but Gripo on here has a brand new Piper cam for sale cheap.
power delivery has always been more importnat to me than max numbers, the way it comes on boost and the shape of the curve makes as much difference to the times as the actual bhp. In the end 15psi came from the most i could get at last dyno session on the external wastegate spring and boostsolenoid. Always planned to run more boost, but have decided to rebuild the car from the ground up following a pretty hefty shunt and go in a different direction on the engine (current class means i can run any engine). Had planned to run approx 21-23psi which i reckon would have seen around 315bhp. Cams make a lot of difference to power delivery, as does the inlet manifold. Std cam strangles breathing over 5k rpm, and allow you can make the same figures as with a hotter cam, you have to shove loads more boost doen its neck which does nothing for the EGTs or reliability. Inlet manifold again strangles things. The fwd facing type are much larger volume and allow shorter and neater intercooler pipe runs. I saw about 15bhp and 25lb/ft of torque when i added my current manifold. See pics in project section and for sale section. the blocks were all machined by a friend who has a precision engineering firm. I gave him a DET block to use as a basis. Gotta be careful as you have to machine thru into the main oil gallery and close to other critical areas. I paid about £100 per block, but that was 5 years ago.
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 Racing is life. Everything else, before and after, is just waiting. - Steve McQueen 
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#2
23-01-2010, 23:10
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one of our guys has a crank from an engine that the HG blew on so hes gonna pull it out and have a look at the condition of it. Will keep ya posted.
i had a tubular top mount manifold, and again frees up breathing at higher boost (1bar+) but if not used with a cam as well it may be a bit disappointing. The tubulars make the turbo come on boost about 250+rpm later, so without the ability to exploit the benefits of the extra breathing of the tubular manifold (bigger turbo, better cam and inlet manifold imho), the worth of the manifold is compromised. Does make turbo access much better though!
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Racing is life. Everything else, before and after, is just waiting. - Steve McQueen
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#3
24-01-2010, 21:06
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Fair enough on the cam mate, and had some interest on the crank on sxoc! win! how much for the forward facing manifold? your right the standard inlet plenums are poo and make for hideous piping angles! it looks like the guy who wants the crank doesnt want the bearings, so maybe another for sale thread in a mo!! best to get bearings to suit the crank rather then grind the crank to suit the bearings! you mentioned a rebuild, dont need any race bearings?ha ha! is the cam Gripo has for sale similar profile to yours? only ask as i dont want an all or nothing engine, would rather have smooth delivery as you said have driven cammed turbos before and you spend half your time waiting then the other half holding on for your life! dont get me wrong i like a bit of a kick in the back but i want the car to be useable other then when im giving it beans!!
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S13 running gear, independent rear suspension, coilovers all round, il post a thread sometime...when i get a chance!! 
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#4
24-01-2010, 21:38
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thread showing the manifold for sale
http://www.nissansilvia.co.uk/vbb/sh...?t=4757&page=4 Gripos cam sale thread http://www.nissansilvia.co.uk/vbb/showthread.php?t=4730 sorry, your bearings wont help me with this rebuild. from memory the stock cam is something like 248deg, 8.8 lift and the Piper is 268 and 10.5mm or similar. the std cams so soft that almost as soon as the engine starts to make good power from the turbo, the cam starts to restrict with little lift and low duration. Your call, but personally without a decent cam the numbers might be there but the power wont be able to be exploited imho. I run the Autosprint cam currently, in fact mine was the first one that Geoff created using my engine spec as the basis. In real terms the Piper or Autosprint will give the improved performance in the range of boosted rpm.
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Racing is life. Everything else, before and after, is just waiting. - Steve McQueen
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#5
24-01-2010, 22:01
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Guess this is still available, what cc are the injectors mate? i currently have 440cc not sure on the maximum hp they will handle with a 255 pump, just checking if the injectors are needed also. is the price delivered?
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S13 running gear, independent rear suspension, coilovers all round, il post a thread sometime...when i get a chance!!
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#6
24-01-2010, 22:17
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injectors are 444cc. So long as your pumps up to it and you have an adjustable fuel pressure reg, they should see 300-320hp.
cheers Craig
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Racing is life. Everything else, before and after, is just waiting. - Steve McQueen
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