dish pistons? - Team Camaro Tech
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post #1 of 13 (permalink) Old Dec 30th, 08, 03:54 PM Thread Starter
Mark
 
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dish pistons?

Is there any disadvantage too running too much of a dish piston on a street engine? Any flame travel or combustion issues? I ‘m looking into using a 32cc to 36cc dish piston to lower the compression to 8.5 to 9.0:1. I trying to turn my strip only engine into a somewhat streetable forced inducted ride with a set cylinder heads that has 52cc chambers.

Last edited by gcr1969; Dec 30th, 08 at 05:31 PM.
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post #2 of 13 (permalink) Old Dec 30th, 08, 09:26 PM
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Re: dish pistons?

I run a -30 dish on my pontiac 455 with 72cc heads runs great pump gas, you have to be sure of the cam you use on this set up or it well not run right alot of them want compression to work.
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post #3 of 13 (permalink) Old Dec 31st, 08, 05:54 AM
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Re: dish pistons?

pistons willl be fine but as stated above use a cam designed for a blower or else youll be disappointed


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post #4 of 13 (permalink) Old Dec 31st, 08, 11:25 AM
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Re: dish pistons?

instead of a regular old school dish, take advantage of modern thinking and tech and go for a "reverse dome" piston- this way, you get the lowered compression but keep your quench nice and tight, which helps with detonation resistance and flame travel and all sorts of other theoretical stuff.

you don't plan sincerity.
you have to make it up on the spot.

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post #5 of 13 (permalink) Old Dec 31st, 08, 12:05 PM
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Re: dish pistons?

Here is some old school dish pistons...


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post #6 of 13 (permalink) Old Dec 31st, 08, 04:14 PM Thread Starter
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Re: dish pistons?

Quote:
Originally Posted by novaderrik View Post
instead of a regular old school dish, take advantage of modern thinking and tech and go for a "reverse dome" piston- this way, you get the lowered compression but keep your quench nice and tight, which helps with detonation resistance and flame travel and all sorts of other theoretical stuff.
Whats the difference between reverse dome and dish. I thought its just the "modern" way to market the same old dish piston.
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post #7 of 13 (permalink) Old Dec 31st, 08, 04:48 PM
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Re: dish pistons?

What they are saying is you don't want a "dog bowl" dished piston if you can help it. The above pictured piston is a "reversed dome". Different companies have different names for them. You want the "D" shaped dish.

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post #8 of 13 (permalink) Old Dec 31st, 08, 06:39 PM
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Re: dish pistons?

Yep..a squish pad farthest from the spark plug side helps to eliminate a 2nd flame front from even starting that could collide with the initial burn and lead to detonation.Driving that far off a/f mixture towards the plug side is beneficial.The D shaped dished piston accomplishes this.

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post #9 of 13 (permalink) Old Jan 1st, 09, 01:26 AM
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Re: dish pistons?

i think the ideal dish would mimic the shape of the chamber in the head- the air/fuel mixture gets smushed into a nicely shaped area where it can more completely combust.
old school dish pistons are just a big round crater in the top of the piston, which leaves no real quench area.

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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post #10 of 13 (permalink) Old Jan 2nd, 09, 02:11 PM
 
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Re: dish pistons?

Imho, the best "dished" pistons follow the exact outline of the chamber.

pdq67



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post #11 of 13 (permalink) Old Jan 2nd, 09, 02:37 PM
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Re: dish pistons?

Quote:
Originally Posted by pdq67 View Post
Imho, the best "dished" pistons follow the exact outline of the chamber.

pdq67
hey- you're back.. some folks over at "big brother" were getting worried about you...

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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post #12 of 13 (permalink) Old Jan 2nd, 09, 03:43 PM Thread Starter
Mark
 
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Re: dish pistons?

Thanks guys for the input. I'll be ordering a set of pistons in the next week. I'll see about matching the dish to the chambers, since the pistons will have to be special ordered. I haven't seen a -36cc inverted dome piston for a GM 18 deg head. Thanks ...Mark
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post #13 of 13 (permalink) Old Jan 3rd, 09, 08:19 AM
 
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Unhappy Re: dish pistons?

I had MASSIVE 'puter problems is all!

Earlier I lost my flat screen monitor and now I have and old CRT jobber, then I lost my key board and got a new one yesterday.

And also I had to take my tower in for a pro unload, reboot and reload! Talk about a real deal, not fun at all!

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