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Post by turbo16 on Sept 15, 2012 17:35:36 GMT -5
I have just mocked up my engine and the pistons sit out of the block 0.005 at the most if you rock them. They are forged Ross pistons and Honda B16A rods with a stock stroke crank. I will be using it in my turbo car that presently has a stock engine and 16# boost. My question is that if I use a Fel-Pro gasket (blue) that will be crushed to .032 will there be enough clearance at 0.027'' or should I try to find a thicker head gasket. Any thoughts or experience would be greatly appreciated
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Post by DOCTOR FIELDS on Sept 15, 2012 21:11:53 GMT -5
I personally try to keep it between .039 - .041". Anything less will try to force the mixture outwards, away from the center of the cylinder. Are you able to mill the pistons any?
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Post by turbo16 on Sept 15, 2012 23:02:16 GMT -5
I really don't want to mill the pistons. I would lose some of the dish and I want to keep the compression at or below 8.7 to 1. I may be wrong about the gasket thickness. It measures @ 0.044''. What do you think a fel-pro blue gasket will crush to? Cometic gaskets can make a 0.050'' if I need it.
thanks for answering my post
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Post by DOCTOR FIELDS on Sept 16, 2012 7:37:07 GMT -5
It's been awhile, but I believe it was around .035" crushed. Will you be running more than 16# boost on the new engine? Felpro blue is the only gasket I would ever use. We had some high compression engines (13.5:1) and never had a problem with them. A buddy of mine ran a Victor Reinz and didn't make it a half a dozen laps into practice before head gasket failure on a similar compression engine.
Sounds like you'll have a nice setup.
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Post by turbo16 on Sept 16, 2012 10:51:41 GMT -5
I have decided to have Cometic gaskets make a gasket that crushes at 0.045'' . I'm still fabricating the intake manifold so a week to ten days won't kill me. I really don't know how much the Fel-pro can handle but it hasn't even hick-uped @ 16# boost. The engine I am using now is all stock with a swirl port head. The new engine will flow better with a ported (good) head and cam. As to how much boost I will run on the new engine the answer is as much as I can safely tune for. I never get greedy I try to tune for the combination. In this case the engine will have a higher rpm range and forged pistons. Forged pistons are sometimes hard to tune because they make noise that has to be ignored by a detonation sensor . So you have to be very accurate with the timing curve so you don't beat out rod bearings and break ring lands. If this engine specs out OK and the cam timing dials in I shouldn't have any problems. I have worked out any fuel injection and turbo problems over a year ago so all the hard work is done. I can now spend some time cleaning out the engine compartment an tucking some wires ect.
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Post by rad15E on Sept 16, 2012 14:46:36 GMT -5
i use the blue gaskets ,my come at 0.040-41 and crush at 0.035, i have brought dome pistons out of the hole as much as o.100 but i always try to keep the guide edge of the piston at least 0.003 in the hole to keep the chatter down,shaveing the the outside of the piston will change your dish cc but will be offseted by the material shaved off compression wise
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Post by turbo16 on Sept 16, 2012 16:50:01 GMT -5
Thanks for the good advice. I will do both. I will prep the pistons for 0 deck and use a Cometic head gasket for a 0.040'' quench. Cometic gaskets are Teflon covered stacked shims and are reusable.
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Post by turbo16 on May 12, 2013 14:23:28 GMT -5
I ended up having to mill the pistons so that they are below the deck less than 0.005'' and use a Fel-pro blue head gasket. The head was ported and not milled. It cc's 42.2 so the compression is 8.9 . I built the engine last night and I am going to adjust the valves cold today does any one have any tips for adjusting the solid lifters I believe they are from Mullis machine. They are very well made and they are already installed into the head bottomed out. Any experience would be greatly appreciated.
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Post by rad15E on May 13, 2013 10:53:16 GMT -5
i have always ajusted mine .005 on the intake and .oo7 on the exhaust measureing at the lash cap cold
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