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Re: Diamond piston/ring problem [Re: '72CudaRacer] #2460971
03/04/18 05:07 PM
03/04/18 05:07 PM
Joined: Jul 2004
Posts: 18,980
State of confusion
T
Thumperdart Offline
I Live Here
Thumperdart  Offline
I Live Here
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Joined: Jul 2004
Posts: 18,980
State of confusion
I run the napier back cut 2nd ring as well..........lower tensions, more power from reduced friction............ beer


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 05:19 PM
03/04/18 05:19 PM
Joined: Dec 2007
Posts: 11,370
Great Neck,LI,new york
hemi-itis Online content
I Live Here
hemi-itis  Online Content
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Joined: Dec 2007
Posts: 11,370
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 05:19 PM.

HEMI-ITIS has no cure. My condition is fully BLOWN!!!

New best 60ft,, 1.42,1/8, 6.0 @117,, 9.38 @146.75 with 6 lbs boost @3700 lbs
Re: Diamond piston/ring problem [Re: '72CudaRacer] #2461014
03/04/18 06:10 PM
03/04/18 06:10 PM

C
crabman173
Unregistered
crabman173
Unregistered
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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 09:58 PM
03/04/18 09:58 PM
Joined: Aug 2003
Posts: 32,309
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 32,309
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


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 10:58 PM
03/04/18 10:58 PM
Joined: Aug 2003
Posts: 1,199
Charlotte, NC
L
LSP Offline
super stock
LSP  Offline
super stock
L

Joined: Aug 2003
Posts: 1,199
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 09:33 PM
03/05/18 09:33 PM
Joined: Aug 2009
Posts: 1,742
Mooresburg, Tn
'
'72CudaRacer Offline OP
top fuel
'72CudaRacer  Offline OP
top fuel
'

Joined: Aug 2009
Posts: 1,742
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
03/06/18 12:38 AM
03/06/18 12:38 AM
Joined: Mar 2008
Posts: 857
Affton MO
Q
qwkmopardan Offline
super stock
qwkmopardan  Offline
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Joined: Mar 2008
Posts: 857
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 04:17 AM
03/06/18 04:17 AM
Joined: Jan 2010
Posts: 1,083
NW Chicago suburban area
Mopar Mitch Offline
super stock
Mopar Mitch  Offline
super stock

Joined: Jan 2010
Posts: 1,083
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 02:51 PM
03/06/18 02:51 PM
Joined: Aug 2003
Posts: 1,199
Charlotte, NC
L
LSP Offline
super stock
LSP  Offline
super stock
L

Joined: Aug 2003
Posts: 1,199
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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