Your opinion.....ring gap for n/a 434 sbc
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Your opinion.....ring gap for n/a 434 sbc
13 deg. 15-1, race gas, drag race, total seal ap top rings, Napier second. Std. Tension oil ring, vac pump.
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Re: Your opinion.....ring gap for n/a 434 sbc
.018 - .021
Or more.
Or more.
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Re: Your opinion.....ring gap for n/a 434 sbc
Piston material?
Block filler?
Target run temp?
More info.
Block filler?
Target run temp?
More info.
Craig.
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Re: Your opinion.....ring gap for n/a 434 sbc
I would set them at .024 and .030 2nd.
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Re: Your opinion.....ring gap for n/a 434 sbc
2618 forged. Probably 175 degrees race temp. No block fill. Darr lil m block.
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Re: Your opinion.....ring gap for n/a 434 sbc
.0045" to .0055" per inch of cylinder bore for the top ring; .0060" to .0070" for the second ring.
Bill
SAE Member (28+ years)
ASE Master Certified Engine Machinist (+ two otherASE Master Certifications)
AERA Certified Professional Engine Machinist
"Do what you can, with what you have, where you are."
- Theodore Roosevelt
SAE Member (28+ years)
ASE Master Certified Engine Machinist (+ two otherASE Master Certifications)
AERA Certified Professional Engine Machinist
"Do what you can, with what you have, where you are."
- Theodore Roosevelt
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Re: Your opinion.....ring gap for n/a 434 sbc
I would go with mark's recommendations for the top ring and open up the second ring to .025
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Re: Your opinion.....ring gap for n/a 434 sbc
Why are you running a standard tension expander with a vacuum pump?
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Re: Your opinion.....ring gap for n/a 434 sbc
Are the pistons gas ported in any way ???
And why a std. oil ring with a vac. pump?? Why no go with a low tension oil ring?? Issues with the combo before??
Real Race Cars Don't Have Doors
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Re: Your opinion.....ring gap for n/a 434 sbc
no reason. I just put back exactly what was in there.
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Re: Your opinion.....ring gap for n/a 434 sbc
Top .027"
Second .030"
Second .030"
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Re: Your opinion.....ring gap for n/a 434 sbc
Then run it the way you did.
Why people set them at the closest they will ring butt is beyond me!
GURU is only a name.
Adam
Adam
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Re: Your opinion.....ring gap for n/a 434 sbc
I'm with ya Adam, there isn't enough TIME, at any kind of reasonable racing rpm,for a couple thou extra to make a difference, gap within reason and put extra safety to it if you are worried about having to chase your tune.
Then put a vacuum pump on it and fuggit 'bout it.
Then put a vacuum pump on it and fuggit 'bout it.

Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl
-Carl