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Re: Diamond piston/ring problem [Re: '72CudaRacer] #2460971 03/04/18 04:07 PM 03/04/18 04:07 PM
Joined: Jul 2004 Posts: 19,318 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,318 State of confusion	I run the napier back cut 2nd ring as well..........lower tensions, more power from reduced friction............ 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Diamond piston/ring problem [Re: '72CudaRacer] #2460978 03/04/18 04:19 PM 03/04/18 04:19 PM
Joined: Dec 2007 Posts: 12,593 Great Neck,LI,new york hemi-itis I Live Here
hemi-itis I Live Here Joined: Dec 2007 Posts: 12,593 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 Last edited by hemi-itis; 03/04/18 04:19 PM. HEMI-ITIS has no cure. My condition is fully BLOWN!!

Re: Diamond piston/ring problem [Re: '72CudaRacer] #2461014 03/04/18 05:10 PM 03/04/18 05:10 PM
C crabman173 Unregistered
crabman173 Unregistered C	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

Re: Diamond piston/ring problem [Re: ] #2461164 03/04/18 08:58 PM 03/04/18 08:58 PM
Joined: Aug 2003 Posts: 43,882 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,882 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 Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Diamond piston/ring problem [Re: hemi-itis] #2461201 03/04/18 09:58 PM 03/04/18 09:58 PM
Joined: Aug 2003 Posts: 1,314 Charlotte, NC L LSP pro stock
LSP pro stock L Joined: Aug 2003 Posts: 1,314 Charlotte, NC	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

Re: Diamond piston/ring problem [Re: LSP] #2461685 03/05/18 08:33 PM 03/05/18 08:33 PM
Joined: Aug 2009 Posts: 2,076 Mooresburg, Tn ' '72CudaRacer OP top fuel
'72CudaRacer OP top fuel ' Joined: Aug 2009 Posts: 2,076 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

Re: Diamond piston/ring problem [Re: '72CudaRacer] #2461788 03/05/18 11:38 PM 03/05/18 11:38 PM
Joined: Mar 2008 Posts: 883 Affton MO Q qwkmopardan super stock
qwkmopardan super stock Q Joined: Mar 2008 Posts: 883 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

Re: Diamond piston/ring problem [Re: '72CudaRacer] #2461881 03/06/18 03:17 AM 03/06/18 03:17 AM
Joined: Jan 2010 Posts: 1,443 NW Chicago suburban area Mopar Mitch pro stock
Mopar Mitch pro stock Joined: Jan 2010 Posts: 1,443 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! 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!

Re: Diamond piston/ring problem [Re: qwkmopardan] #2462016 03/06/18 01:51 PM 03/06/18 01:51 PM
Joined: Aug 2003 Posts: 1,314 Charlotte, NC L LSP pro stock
LSP pro stock L Joined: Aug 2003 Posts: 1,314 Charlotte, NC	[/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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