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#2460971 - 03/04/18 02:07 PM Re: Diamond piston/ring problem [Re: '72CudaRacer]
Thumperdart Offline


Registered: 07/12/04
Posts: 18696
Loc: State of confusion
I run the napier back cut 2nd ring as well..........lower tensions, more power from reduced friction............ beer
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#2460978 - 03/04/18 02:19 PM Re: Diamond piston/ring problem [Re: '72CudaRacer]
hemi-itis Offline
I Live Here

Registered: 12/29/07
Posts: 10528
Loc: Great Neck,LI,new york
Ever since Diamond was aquired their shipping and QC has been off the mark.I'm sure it will level off.


http://www.performanceracing.com/news/ra...end-performance


Edited by hemi-itis (03/04/18 02:19 PM)
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#2461014 - 03/04/18 03:10 PM Re: Diamond piston/ring problem [Re: '72CudaRacer]
crabman173 Offline
master

Registered: 01/01/06
Posts: 3700
Loc: Big Lick , North Carolina
I think they are doing like CP did with that odd radial depth--think it is a Diamond thing--why?? Who knows!! Total Seal is the go to for any rings and remember they sell Lots of rings not just gapless
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#2461164 - 03/04/18 06:58 PM Re: Diamond piston/ring problem [Re: crabman173]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30814
Loc: Bend,OR USA
All the Diamond piston packages with rings I've bought in the last ten years came with rings size and type I ordered in Total Seal boxes work
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#2461201 - 03/04/18 07:58 PM Re: Diamond piston/ring problem [Re: hemi-itis]
LSP Offline
super stock

Registered: 08/19/03
Posts: 1190
Loc: Dallas, TX
Originally Posted By hemi-itis
Ever since Diamond was aquired their shipping and QC has been off the mark.I'm sure it will level off.

Aquired by management that do not know anything about making pistons, or the piston business. Key personnel that do will leave, personnel that can help won't be brought in. Machining, QC processes, and costs will be cut, and quality will suffer. CP got real busy soon after the below announcement, racers have seen this story play out over and over.

http://www.performanceracing.com/news/ra...end-performance

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#2461685 - 03/05/18 06:33 PM Re: Diamond piston/ring problem [Re: LSP]
'72CudaRacer Offline
top fuel

Registered: 08/31/09
Posts: 1714
Loc: Mooresburg, Tn
Talked Kevin at Total Seal today, less than 3 mi he gave me a part # for the rings that I need, they come in a set. Told me that Diamond makes a lot of custom piston to fit their "advanced profile" ring sets.
Thanks for all your help, I learned something new! Will never make this mistake again.

Brian

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#2461788 - 03/05/18 09:38 PM Re: Diamond piston/ring problem [Re: '72CudaRacer]
qwkmopardan Offline
super stock

Registered: 03/26/08
Posts: 851
Loc: Affton MO


The old rings were gapped for nitrous use (but not used), top ring gap was over .030". This owner will not use nitrous, that was one of the reasons for me fixing the engine.

Brian [/quote]

4.600 bore engine I would have top ring gap over .030 for N/A and a little more if forced induction or nitrous. A little extra gap doesn't hurt anything, not enough could get ugly fast. Dan

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#2461881 - 03/06/18 01:17 AM Re: Diamond piston/ring problem [Re: '72CudaRacer]
Mopar Mitch Offline
super stock

Registered: 01/17/10
Posts: 1038
Loc: NW Chicago suburban area
DO NOT CUT THE RINGS... I'd simply contact Diamond and discuss the matter with them.

I'e been working for a major global piston ring manufacturer for past 12 years... interesting things I've learned!
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Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!

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#2462016 - 03/06/18 11:51 AM Re: Diamond piston/ring problem [Re: qwkmopardan]
LSP Offline
super stock

Registered: 08/19/03
Posts: 1190
Loc: Dallas, TX
[/quote]

4.600 bore engine I would have top ring gap over .030 for N/A and a little more if forced induction or nitrous. A little extra gap doesn't hurt anything, not enough could get ugly fast. Dan [/quote]

No, .016", just tight enough so the feeler gauge by itself is held in the gap.

Diamond doesn't build engines, or rings.

And yes, it makes a difference.

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