Fly-cutting for the L92 heads - Question
10-18-2006, 10:00 AM
#2
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Originally Posted by WKMCD
Has anybody fly-cut their pistons for the L92 heads yet? I looks like we're going to have to on my setup.
All help greatly appreciated.
All help greatly appreciated.
Can you give us an idea of duration and advance? It would help others choose a cam that don't want to flycut.
10-19-2006, 09:24 AM
#5
We've seen a .010" average difference in intake valve depth relative the deck surface between the L92 and LS1 heads due to the larger diameter valve. Be careful when flycutting any piston for L92 head valve clearance! With the close proximity of the top ring land it's very easy to make an accidental gas port into the top ring.
Aftermarket stainless valves virtually all of which have a thicker margin or edge will make p/v clearance a real issue with even mild cam grinds.
Good luck.
Richard
Aftermarket stainless valves virtually all of which have a thicker margin or edge will make p/v clearance a real issue with even mild cam grinds.
Good luck.
Richard
10-20-2006, 06:55 PM
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Originally Posted by WKMCD
Has anybody fly-cut their pistons for the L92 heads yet? I looks like we're going to have to on my setup.
All help greatly appreciated.
All help greatly appreciated.
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10-21-2006, 10:36 PM
#9
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I flycut my mahle pistons off the side of pistons and still have plenty of thickness in the crown area. I am running the g5x4 cam and already had heads ported. I called mahle pistons about the flycutting in the crown and they give me the ok. You just need to debur it well. If you all take notice there are alot of pistons out there that have valve pockets off the side of pistons.
10-22-2006, 01:26 AM
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Originally Posted by SStrokerAce
STOP w the cam spec questions. Neither of us are going to tell on PM or the board.
Bret
Bret
Nate
10-22-2006, 01:26 AM
#11
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Originally Posted by WKMCD
Spec's are between me and SStrokerAce...Sorry.
Nate
10-22-2006, 04:28 PM
#12
Originally Posted by Nate_Taufer
I don't want your cam specs for my use...im just trying to get an idea of what is going to fit without flycutting. Quit being such a child about it.
Nate
Nate
Nate,
If you want to do this then LEARN what it takes to make a accurate guess at that and you can do it on your own then.
Bret
10-22-2006, 04:28 PM
#13
Originally Posted by king jack
I flycut my mahle pistons off the side of pistons and still have plenty of thickness in the crown area. I am running the g5x4 cam and already had heads ported. I called mahle pistons about the flycutting in the crown and they give me the ok. You just need to debur it well. If you all take notice there are alot of pistons out there that have valve pockets off the side of pistons.
Problem here is the 2.200" valve relief that is needed for these intake valves.
