Thread: Dish and Quench

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Does dish on top of a piston affect quench? I might have to used dished pistons to get the compression ratio I want, and it seems like the crown would be further away from the head if I did so. That's bad, right? I'm thinking I'll need a -12 to -15 cc dish to get 9.3-9.6:1 comrpession. I might use the -15 and then deck slightly above 0 to get 9.4 or 9.5. I do plan to cc the combustion chambers so I could loose some comrpession there. I might take out 2 or 3 cc's.

Hey 76 GMC, the dish does not come into the calculations when you are measuring quench. You need to keep .040-.050 distance from the piston edge to the head.

I don't care about the mathmatical calcualtion of quench, I want to know about the actual quench. The piston crown will be further from the cylinder head because of the dish, but will it have an effect on quench? I'm going to zero deck so the quench distance will be .039.

Got a sort'a related question.
Dish pistons are supposed to be better at supressing denotation, because it changes flame travel. Is that a correct assumption?
If that is true wth a blower... Can you get by with a higher FINAL compression ratio with a dish piston than with a flat top, octane being the same with both?

That is what I wanted to hear.

The idea of a dished piston is to lower compression while maintaining the proper quench distance.

Originally posted by '51 flattie
The idea of a dished piston is to lower compression while maintaining the proper quench distance.

Nicely stated. Dish does not effect quench. Welcome aboard.