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Dished vs Flat-top vs Domed pistons #1352473 12/16/12 09:37 AM 12/16/12 09:37 AM
Joined: Nov 2012 Posts: 358 western PA S Sb Valiant OP enthusiast
Sb Valiant OP enthusiast S Joined: Nov 2012 Posts: 358 western PA	Dished and Flat-top offer the best flame travel and are the most efficient. Also quick combustion. This sounds like the way to make power right? Has anyone ever try getting alot of compression out of a dished or flat-top piston or never bothered and went to dome?

Re: Dished vs Flat-top vs Domed pistons [Re: Sb Valiant] #1352474 12/16/12 09:43 AM 12/16/12 09:43 AM
Joined: Jul 2010 Posts: 1,491 Oologah, Oklahoma Big Squeeze pro stock
Big Squeeze pro stock Joined: Jul 2010 Posts: 1,491 Oologah, Oklahoma	Yeah, you just stroke it and bore it as much as possible... If you can't handle the truth, you're living a lie.......

Re: Dished vs Flat-top vs Domed pistons [Re: Big Squeeze] #1352475 12/16/12 10:16 AM 12/16/12 10:16 AM
Joined: Mar 2010 Posts: 940 glendora, ca. D Deepockets super stock
Deepockets super stock D Joined: Mar 2010 Posts: 940 glendora, ca.	good question. the pistons i got from je are inverted dish. they said they will produce more power over a stepped dish. i'm at 12.3 compression.

Re: Dished vs Flat-top vs Domed pistons [Re: Deepockets] #1352476 12/16/12 11:10 AM 12/16/12 11:10 AM
Joined: Nov 2012 Posts: 358 western PA S Sb Valiant OP enthusiast
Sb Valiant OP enthusiast S Joined: Nov 2012 Posts: 358 western PA	Come on Moparts!!! Is today just a slow day or what???

Re: Dished vs Flat-top vs Domed pistons [Re: Sb Valiant] #1352477 12/16/12 11:12 AM 12/16/12 11:12 AM
Joined: Apr 2004 Posts: 12,339 somwhere S smokinwoody I Live Here
smokinwoody I Live Here S Joined: Apr 2004 Posts: 12,339 somwhere	our race version of the 499 we had(still have the block)I had JE flattops 10-1's.. the block is 10.700 decked, which left the pistons slightly out of the hole.. the heads were milled .075 for a 72cc chamber... this left a 12.7-1 compression... new block, same 499, this time a lowered compression to run on 93 pump and for the street.. decked 10.700, JE dished pistons, same heads.. 10.0-1 compression and 700+hp

Re: Dished vs Flat-top vs Domed pistons [Re: Sb Valiant] #1352478 12/16/12 11:57 AM 12/16/12 11:57 AM
Joined: Jun 2004 Posts: 6,780 Alabama Mopar-Al master
Mopar-Al master Joined: Jun 2004 Posts: 6,780 Alabama	I put my Ross pistons flat tops at .009 in the hole, then cut the heads to 63 cc. Then cometic .040 hg's 4.375 bore x 4.25 stroke.

Re: Dished vs Flat-top vs Domed pistons [Re: Sb Valiant] #1352479 12/16/12 12:15 PM 12/16/12 12:15 PM
Joined: Feb 2005 Posts: 370 Real North Cal. 6 66er enthusiast
66er enthusiast 6 Joined: Feb 2005 Posts: 370 Real North Cal.	I have Ross flat tops @ .070" above the deck. I use open chamber RPMs with a little extra clearance around the edges. I came up with 12.4:1 with .040 quench. I used stocking piston for a 451(3.75 stroke)with a 3.91 stroke crank. It worked great, it still runs good after approx. 1000 passes.

Re: Dished vs Flat-top vs Domed pistons [Re: 66er] #1352480 12/16/12 12:27 PM 12/16/12 12:27 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I like the flattop piston where you can get quench and good comp as I think it works better then a dome that can hurt the flame travel. When I put my 493 together I had to much comp with a flattop piston at zero deck. My comp would have been close to 12.0 and I wanted it in the 10.5 area as its a pump gas eng and I wanted quench so I was not going to a piston further down in the hole. So these dished pistons worked perfect. I like that I dropped my comp to 10.6 and they are made to still have the flat for quench. I ended up with 10.6 and .046 quench. I can run 38 total timing all in by 1800 rpm and no ping or spark knock at all. Ron

Re: Dished vs Flat-top vs Domed pistons [Re: 383man] #1352481 12/16/12 12:35 PM 12/16/12 12:35 PM
Joined: Nov 2012 Posts: 358 western PA S Sb Valiant OP enthusiast
Sb Valiant OP enthusiast S Joined: Nov 2012 Posts: 358 western PA	I like where you are coming from on that! We don't run pump gas at all but how much compression can be made using the quench and a flat top or dish piston depending on the heads. Is 13:1 possible?

Re: Dished vs Flat-top vs Domed pistons [Re: Sb Valiant] #1352482 12/16/12 12:45 PM 12/16/12 12:45 PM
Joined: Feb 2011 Posts: 1,454 Glendora Ca. J Just-a-dart pro stock
Just-a-dart pro stock J Joined: Feb 2011 Posts: 1,454 Glendora Ca.	Quote: I like where you are coming from on that! We don't run pump gas at all but how much compression can be made using the quench and a flat top or dish piston depending on the heads. Is 13:1 possible? No problem with a big bore stroker with smaller chambers. Spend some time with some of the on line calculators and you can quickly see what is possible. Here is one of many http://www.wallaceracing.com/cr_test2.php Last edited by Just-a-dart; 12/16/12 12:54 PM. "Just a Bracket car dressed up like a streetcar"

Re: Dished vs Flat-top vs Domed pistons [Re: Sb Valiant] #1352483 12/16/12 01:39 PM 12/16/12 01:39 PM
Joined: Jan 2003 Posts: 75,379 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,379 A gulag near you.	Quote: I like where you are coming from on that! We don't run pump gas at all but how much compression can be made using the quench and a flat top or dish piston depending on the heads. Is 13:1 possible? How about a little info like bore size and head CC you have in mind ?

Re: Dished vs Flat-top vs Domed pistons [Re: JohnRR] #1352484 12/16/12 04:05 PM 12/16/12 04:05 PM
Joined: Nov 2012 Posts: 358 western PA S Sb Valiant OP enthusiast
Sb Valiant OP enthusiast S Joined: Nov 2012 Posts: 358 western PA	I have w2 econo heads with big cc chambers. They are not cut yet but I am thinking about having them done. I can't remeber the exact number but the cc chamber size is like 72 cc. Bore size is just stock 340 at the moment which is a 4.040. Stroke is stock as well 3.31. I would like to probaly bore the 340 out 60 over or may keep it safe and only go 30 or 40 over. I would like to take the cc chambers down a good bit. I am not sure how low I can take them. Something in the low 60 high 50 cc range would be nice!

Re: Dished vs Flat-top vs Domed pistons [Re: Sb Valiant] #1352485 12/16/12 04:56 PM 12/16/12 04:56 PM
Joined: Oct 2003 Posts: 11,718 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,718 W. Kentucky	My 408 has 10.9-1 compression with a 55 cc combustion chamber and a 20 or 22 cc dish. IIRC with the same head and a flat top piston in my 340 was 11.2-1.

Re: Dished vs Flat-top vs Domed pistons [Re: Sb Valiant] #1352486 12/16/12 05:43 PM 12/16/12 05:43 PM
Joined: Jan 2003 Posts: 75,379 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,379 A gulag near you.	Quote: I have w2 econo heads with big cc chambers. They are not cut yet but I am thinking about having them done. I can't remeber the exact number but the cc chamber size is like 72 cc. Bore size is just stock 340 at the moment which is a 4.040. Stroke is stock as well 3.31. I would like to probaly bore the 340 out 60 over or may keep it safe and only go 30 or 40 over. I would like to take the cc chambers down a good bit. I am not sure how low I can take them. Something in the low 60 high 50 cc range would be nice! You need to sonic check that block if its an original 340 block to make sure you can go as big as you want. Is it possible to even cut a W2 to 50cc ? I did some calculations , if you want 13.0 compression you are going to have to put a big dome on a piston or stroke it .

Re: Dished vs Flat-top vs Domed pistons [Re: JohnRR] #1352487 12/16/12 05:52 PM 12/16/12 05:52 PM
Joined: Jan 2003 Posts: 4,002 Joplin, Mo R rt66jim master
rt66jim master R Joined: Jan 2003 Posts: 4,002 Joplin, Mo	Mine is a .030 over 340 with a 4" crank(416). Pistons are Wiseco ProTru flat tops. Zero deck with Econo W-2's 72 cc's. My CR is 11.2.

Re: Dished vs Flat-top vs Domed pistons [Re: rt66jim] #1352488 12/16/12 10:17 PM 12/16/12 10:17 PM
Joined: Apr 2011 Posts: 323 jonestown,pa D dmking enthusiast
dmking enthusiast D Joined: Apr 2011 Posts: 323 jonestown,pa	flat top or inverted dish.

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