flat tops with forced induction?
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Teching In
Joined: Aug 2004
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flat tops with forced induction? Hey ppl
Just got a technical question. I have a funny combination (not ls1 motor) anyway a good piston i have found that'll sit in a good spot in the block (20thou under deck) is a ross pistons and its probably the single best option available to me. The problem is its a flat top, but even with the flat top and valve reliefs it gives a ratio of around 8.8:1 which is exactly what i was after anyway. Most ppl always run dished pistons (mostly just to lower comp i guess)
Anyway the question is, given its a good compression (which it is) is there any problem with usiing flat top pistons in a blown/turbo combination?
Just got a technical question. I have a funny combination (not ls1 motor) anyway a good piston i have found that'll sit in a good spot in the block (20thou under deck) is a ross pistons and its probably the single best option available to me. The problem is its a flat top, but even with the flat top and valve reliefs it gives a ratio of around 8.8:1 which is exactly what i was after anyway. Most ppl always run dished pistons (mostly just to lower comp i guess)
Anyway the question is, given its a good compression (which it is) is there any problem with usiing flat top pistons in a blown/turbo combination?
The main reason to use a dished/inverted dome piston versus dropping below the deck is to drop CR while maintaining the quench area. Or because the comp height on the piston is such that a good ring stack w/ a large top ringland just won't fit.
But even at .020 deck + a resonable gasket thickness you should still have decent quench. A little more distance than ideal, but ok none the less.
But even at .020 deck + a resonable gasket thickness you should still have decent quench. A little more distance than ideal, but ok none the less.
Just like Harlan said -- in an ideal world you don't really want the piston in the hole that much, so by going to a dished piston you can run the piston up further giving you a better quench without affecting the compression ratio.
Also, another benifit is that a dished piston is more "ideal" for combustion then a flat top (and certainly more than a dome!!).
Also, another benifit is that a dished piston is more "ideal" for combustion then a flat top (and certainly more than a dome!!).
