Is quench area a factor on a boosted engine?
#1
Is quench area a factor on a boosted engine?
Engine is a LT1: 385 CI, -12 pistons, zero deck, LT1 worked heads, the cam is 550 lift. (also a manual trans)
I was running cometic .55 gaskets, mainly to get the piston to valve clearance of .95. ( Manual = possible missed gear, so I like a little extra clearance ).
I'm doing a rebuild and was planning on going to the cometic .75 gasket because I think due to the zero deck and milled heads my compression is a bit high.
Does anyone see anything wrong with using that thick a head gasket? Would there be any adverse effect to worry about?
If I add .20 to the P-T-V clearance, if I go to a 570 lift, given the same duration and LSA does my PTV stay .95.
I was running cometic .55 gaskets, mainly to get the piston to valve clearance of .95. ( Manual = possible missed gear, so I like a little extra clearance ).
I'm doing a rebuild and was planning on going to the cometic .75 gasket because I think due to the zero deck and milled heads my compression is a bit high.
Does anyone see anything wrong with using that thick a head gasket? Would there be any adverse effect to worry about?
If I add .20 to the P-T-V clearance, if I go to a 570 lift, given the same duration and LSA does my PTV stay .95.
#2
using the bigger gasket isn't a big deal in boost apps, the added quench distance isn't nearly as important as an n/a engine, there is alot of turbulence in the chamber under boost. theres some good reads over at speedtalk.com, just search it.
#9
The stock Neon SRT-4 pistons run 0.340 clearance to the cylinder head.
I have a friend with a boosted SBF running at 0.250" with no issues.
Can anyone comment on why even an OEM would leave that much to be desired above the piston deck? Longer rod could be possible. Maybe they were constrained by the CC volume and had to do that to hit their CR while keeping a tough piston? Just a wild guess.
Thanks,
Scott.
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