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440 Smooth Dish Tops?
#1676687
09/25/14 05:38 AM
09/25/14 05:38 AM
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Joined: Jul 2014
Posts: 68
USA MO
cdoublejj
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OP
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Posts: 68
USA MO
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Every Dish Top for the 440 I have seen (web site/catalog pics) have valve reliefs cut in to it. does any one sell any with out any edges, marks, cuts or reliefs?
EDIT: The best I have seen are reverse dome tops, the bevel could be smooth/rounded out but, but, it still have flat part on one side.
Last edited by cdoublejj; 09/25/14 05:39 AM.
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Re: 440 Smooth Dish Tops?
[Re: cdoublejj]
#1676688
09/25/14 10:35 AM
09/25/14 10:35 AM
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Joined: Oct 2006
Posts: 596
Mass.
80fbody
mopar
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mopar
Joined: Oct 2006
Posts: 596
Mass.
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Edit:Realized you wanted "dished". Nevermind.
Last edited by 80fbody; 09/25/14 10:37 AM.
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Re: 440 Smooth Dish Tops?
[Re: 80fbody]
#1676689
09/25/14 03:26 PM
09/25/14 03:26 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Why don't you want valve reliefs?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: 440 Smooth Dish Tops?
[Re: dogdays]
#1676691
09/26/14 01:14 AM
09/26/14 01:14 AM
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Joined: Jul 2014
Posts: 68
USA MO
cdoublejj
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Quote:
I don't understand why the request, but many piston manufacturers will give you one or two changes for a nominal fee. That change could be leaving out the valve notches.
R.
Thank you i will keep that in mind!
Quote:
Why don't you want valve reliefs?
You know what happens to edges and sharp edge in the combustion chamber? They get hot, hotter than the other parts. Think about a heat sink, why do heat sinks have some any edges and lines?
Well after so much compression that hot edge can cause per-detonation. So if your shoving LBS and LBS and pressure in there in bumping up the pressure at TDC and pushing the flashpoint of the fuel and that hot edge is there ...hotter than rest of the parts it might cause it to go boom before the spark plug fires.
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Re: 440 Smooth Dish Tops?
[Re: cdoublejj]
#1676692
09/26/14 02:49 AM
09/26/14 02:49 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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regarding the sharp edges, I spend ALOT of time deburring them extensively on piston tops
live every 24 hour block of time like it's your last day on earth
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Re: 440 Smooth Dish Tops?
[Re: 451Mopar]
#1676694
09/26/14 03:36 PM
09/26/14 03:36 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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I Live Here
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I think you're overthinking the issue. Rounding and smoothing should eliminate any hot spots.
Go on ebay and look at the NASCAR used pistons for sale to see what professional racers, who are at 14:1 or whatever the limit is nowadays, do.
I would use a D-shaped dish (inverted dome) and leave a squish area even if you're using open chamber heads right now, because if you switch later they'll work better.
R.
Last edited by dogdays; 09/26/14 03:38 PM.
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Re: 440 Smooth Dish Tops?
[Re: cdoublejj]
#1676696
09/27/14 11:05 PM
09/27/14 11:05 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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closed chambers (915/516) have a bowl area and open chambered heads (906 & others) have that bowl plus a recessed shelf area (.100" deep). See if you can Google pics. If you have plateau pistons then if you later switch to closed chambered heads you can either achieve quench or at least be able to work with the CC's to get the SCR in a comfortable range
live every 24 hour block of time like it's your last day on earth
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