Re: Pistons, what brand, what options?
[Re: merpar]
#2831727
10/11/20 09:52 PM
10/11/20 09:52 PM
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Joined: Jan 2003
Posts: 6,163 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,163
Melbourne , Australia
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I think most companies will do a nice piston, I will be getting a set of BME's for my next project. The CP and Diamond pistons I've seen look really nice and well finished as well.
As has been mentioned, a good relationship is particularly important as well.
Alan Jones
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Re: Pistons, what brand, what options?
[Re: merpar]
#2832092
10/12/20 08:52 PM
10/12/20 08:52 PM
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Joined: Aug 2003
Posts: 1,314 Charlotte, NC
LSP
pro stock
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pro stock
Joined: Aug 2003
Posts: 1,314
Charlotte, NC
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LSP, I didn't reply to your first post. Felt it was out of line. Persistent ain't ya? Greg asked a question about piston recommendations. I gave him my opinion. As for slipper design. I will not divulge that info. Just for your info I retired from United Engine & Machine in 04', who is KB pistons and Icon. I helped build the machines that machine the slippers. Not of my design though, that was before my time. So if you're looking for a fight go somewhere else cause this is all the info you deserve from me. You said "best in the business" slipper piston, all I asked was a simple and easy show me, I never asked for or need any technical or design data from you.
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Re: Pistons, what brand, what options?
[Re: gregsdart]
#2832117
10/12/20 09:51 PM
10/12/20 09:51 PM
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Joined: Aug 2003
Posts: 1,314 Charlotte, NC
LSP
pro stock
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pro stock
Joined: Aug 2003
Posts: 1,314
Charlotte, NC
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I have my name on a World aluminum block, and may buy new pistons to best match the combo. I talked to Ross pistons today and got some ideas. For sure what i want is .043 , .043, 3mm low tension rings, gas ports and skirt coatings. Ed at Ross suggested .200 wall pins from tool steel. This will be the same configuration, 550 cubes, 15/1 compression. What piston brands are good, and any options i should consider? Regardless of what Indy, World, etc. tell you, aluminum blocks make in the neighborhood of 2% less power, that can be lessened somewhat with a thinner more conforming ring pack. T/S #CS9934500 is a .9mm,.9mm,3.0mm ring set, the top ring is CrN coated, it'll last a very long time. Put the top ring .150" down on the piston, .200" 2nd land (no accumulator groove), and .100" 3rd land. Ask for .003" top ring back clearance, and add 16 .040" vertical gas ports .004" into the top ring groove back wall. Give your cylinder bore length to the piston company, and tell them that you DO NOT want the piston skirt hanging out of the bottom of your bore at BDC no more than .250". Put at least four .125" split oil drain backs at the top of both skirts, ask to have the piston COM balanced. There's only two skirt coatings worth considering, Calico's CT-3 or Line2Line's, if you choose Line2Line call Brian at Line2Line in SC, he'll get it right. Gap the top ring .020", 2nd ring .040", top oil rail .040, bottom oil rail as little as .012" if possible, if not that's fine. You've got a tall/heavy piston and a lot of piston speed going, so I'd say a .200" wall pin is minimum, I'd prefer .225" or more, C-350 is the best pin material, DLC coated if possible.
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Re: Pistons, what brand, what options?
[Re: LSP]
#2832228
10/13/20 09:50 AM
10/13/20 09:50 AM
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Joined: May 2019
Posts: 722 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 722
Lake Villa Il
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^ No accumulator groove because of 1st/2nd ring proximity or some other reason?
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: Pistons, what brand, what options?
[Re: INTMD8]
#2832265
10/13/20 12:07 PM
10/13/20 12:07 PM
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Joined: Aug 2003
Posts: 1,314 Charlotte, NC
LSP
pro stock
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pro stock
Joined: Aug 2003
Posts: 1,314
Charlotte, NC
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^ No accumulator groove because of 1st/2nd ring proximity or some other reason? Weakens the 2nd land, which needs to support the top ring that has about 1400 psi above it in this case.
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Re: Pistons, what brand, what options?
[Re: gregsdart]
#2832297
10/13/20 01:36 PM
10/13/20 01:36 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Every piston ive ever ordered looks nicer than the previous. Used Ross fo a long time. Recently Mahle. Was turned on to Mahle by the engine builder at Realtime racing. They are Acura’s roadcar race team. 9000+ rpm engines. Ive seen pistons out of engines that dropped valves at High rpm. Pistons are junk, but stay together. Very strong and stable materials with tight expansion rates. Skirt designs that make sense. Have there own coating. I was planning on using these in my early hemi build. My machine shop suggested racetec. I mistakenly let him order them. I guess between knowing my previous builds and what is planned for this new build, that I would get something pretty nice. I don’t know whose fault (other than mine) it was, but the first set of 10 came in with the wrong bore size. After several months ( covid) I got the correct bore size. These things are heavy. Skirt supports look like a design from the ‘50s. Rod relief/ lightening is coarse with burrs still on the edges. Really disappointed in myself for not ordering the Mahles. Im sure racetec is capable of making a nice product, but pistons shouldn’t leave the building with burrs on them. My point is not to assume anybody knows what you want. Be involved in your request, and use companies that you know will give you what you request.
"use it 'till it breaks, replace as needed"
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Re: Pistons, what brand, what options?
[Re: boatracer572]
#2832490
10/13/20 10:09 PM
10/13/20 10:09 PM
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Joined: Jan 2003
Posts: 10,088 Frostbitefalls MN (Rocky&Bullw...
gregsdart
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 10,088
Frostbitefalls MN (Rocky&Bullw...
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Wow. Lots to consider. Tommorow AM i will pull the piston in the bad hole so i know what i am working with. Not sure what i can budget for this deal but sure would like to go with the latest and greatest if i go with new pistons in a aluminum block. Thanks all for the input!
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Pistons, what brand, what options?
[Re: Biginchmopar]
#2832898
10/15/20 12:58 AM
10/15/20 12:58 AM
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Joined: Nov 2010
Posts: 1,397 Carson City, Nevada
Biginchmopar
pro stock
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pro stock
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
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Not that ICON is the only company that bult me nice stuff, here are BME examples:
#1 BME Predator
#2 BME Nitrous Small Mopar
Last edited by Biginchmopar; 10/15/20 01:09 AM.
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