Piston Flycutting in engine / car
^ No, he moved the pistons...
This is a good write up, but you made the first part way too complicated. You can also use the base idea that roughly milling .007 = -1cc of combustion chamber size.
Ok, scratch milling the junk head. I just got off the phone with Jason at Texas Speed. He said they mill 0.040 off the heads to get a 59cc chamber. So my measuring technique was pretty much right on. But, he did say that he does things a bit different. He uses an unmilled head, and no head gasket. On LS1s the piston comes out of the bore slightly. He suggested bolting the unmilled head on the block, and then rotating the piston around till it pushes up against the head. This will keep the piston in a positive position, and you don't need to worry about getting TDC, since ti will automatically be pretty much there. This will also keep the piston preloaded, and prevent it from rocking and chattering when cutting the reliefs. I think I'll use that method instead.
Just to be clear, cutting 0.007" of reliefs is NOT -1cc. I think you're talking about milling the heads. I'd venture to say that my reliefs are 1cc with both intake and exhuast added together.
Last edited by Kevin Doe; Oct 31, 2008 at 02:56 PM.
I agree, I did make it too complicated. I was thinking about rewriting it all to make a single clear post as a tutorial.
Just to be clear, cutting 0.007" of reliefs is NOT -1cc. I think you're talking about milling the heads. I'd venture to say that my reliefs are 1cc with both intake and exhuast added together.
Just to be clear, cutting 0.007" of reliefs is NOT -1cc. I think you're talking about milling the heads. I'd venture to say that my reliefs are 1cc with both intake and exhuast added together.
Just to put this out there. I think your 0.003" depth difference may be due to the tape? I am not sure how thick/thin that material is, but it seemed consistent on the exhaust/intake with what you cut and what you gained as far as PTV clearance.
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My question there is putting the junk head on the block without a gasket: how much of a risk is it to scratch up the deck of the block?
My Lindy tool will be here this week. And I'll be doing the same... just on an engine stand, because you can't really do this in an F-Body unless you are insane or small enough to sit in the engine bay.
My Lindy tool will be here this week. And I'll be doing the same... just on an engine stand, because you can't really do this in an F-Body unless you are insane or small enough to sit in the engine bay.
I think you'd have to literally DRAG the head against the surface. I'm running studs, and they don't have to come out for head swaps, so I'm covered in that department...
Necro aside if you troll the forums Kevin hangs out on he has the ability to over engineer and over document (that a bad thing?) everything he does. HAS to have some OCD. There are quite a few posts of his on rx7club and norotors.
He was one of the first guys to document how to fit a 315 tire on a stock body RX without anything more that rolling the fender lip and some suspension parts almost everyone has anyway.
He was one of the first guys to document how to fit a 315 tire on a stock body RX without anything more that rolling the fender lip and some suspension parts almost everyone has anyway.
