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Discussion Starter #1
Take a look at this Diamond 40031 piston in a 4.440 bore used in a 557" 6.7 Rod 4.5 stroke Nitrous motor.
There is .037 ring gap on the top ring and ring is still intact.
What would you say caused this damage?
 

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...Nitrous motor...What would you say caused this damage?
Is this a serious question? If so you should re-consider your nitrous usage until schooling up on the tune-up, or getting with someone to show you the way (Induction Solutions, perhaps)...
 

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rattled it good
 

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Discussion Starter #4
Diamond Piston 40031

Hum Just picked this rig up and with the rings set at .037 and a 12deg chip when I broke it down thought I would ask.
It has been suggested that the rings butted and did this.
I though maybe fuel not sure that is why I asked here.

I will see if some one at Induction Solution will take a look at the pick and comment also.
 

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Discussion Starter #6
Diand / Nitrous

Know that we know what broke it know we need to fix it.

After heads resurface - .021 the heads came to 62CC
Buy using Diamonds Comp calculator and a .070 Cometic MLS gasket the comp comes to 14.25 to 1 not sure I want to go any thicker on the head gaskets, any thoughts?
 

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I have some @ .110 thick ,with 3 kits on the engine,

but .070 will be fine if you want that comp ratio
 
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