Quote:
Originally Posted by gvr4
Quench really comes into play on NA engines, but I would think that with the dynamic compression these mitsu engines are seeing, it doesn't have as much of an effect. Especially with dish pistons, there really isn't much quench area on the DSM pistons I've seen, whereas on my Trans Am, almost half the piston is quench area. On my Trans Am, with a -.001 deck and a thin gasket, quench height is at .032". Its details like that that let me run a nice streetable cam and still make the same power as guys running xe284's.
I'm still kinda shaking my head on how little actual information there is out there about these engines. I've been unable to find the stock dish cc on the IX pistons, but I finally did come across the number for milling the heads: 1cc per .007" milled. It would be nice if someone would take the time to publish all the numbers for various configurations, since basically you can mix and match parts from any of them to get OEM parts for any goals you have.
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Magnus offers a piston with "an improved" quench design for the 4g63.
Other manufacturers design boosted engines with a more ideal quench band than mitsu does. I'm curious why others care and mitsu doesn't.
Did you measure deck height with the stock piston by chance? My notes were a 6 bolt would be closer to .015, but not sure how accurate that is. If so that means the evo 9 piston sits way lower.
Goodhart, yeah I agree his hg measurement is what id expect according to my post, but the .05 deck height surprised me. But the evo 9 deck height was around that, so I guess that just means these piston are that much shorter maybe. Kinda interesting.
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