Bearing clearance? Rings end gap for FI?
06-08-2006, 12:39 PM
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Bearing clearance? Rings end gap for FI? What do you guys look for as far as bearing clearances for rod and mains. As well what about ring gaps too? Also what brand are prefered for rings, and bearings. Motor is a 346, pistons are JE 3.905 for a 6.125 rod, and rods are Eagle H-beam 6.125 on centre. Car is a daily driver/strip warrior-boost will be no more than 15psi( P1SC know and D1SC next year). Any input is greatly appreciated-thanks!
06-08-2006, 02:26 PM
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06-08-2006, 02:53 PM
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06-08-2006, 07:31 PM
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Originally Posted by Vortech
What do you guys look for as far as bearing clearances for rod and mains. As well what about ring gaps too? Also what brand are prefered for rings, and bearings. Motor is a 346, pistons are JE 3.905 for a 6.125 rod, and rods are Eagle H-beam 6.125 on centre. Car is a daily driver/strip warrior-boost will be no more than 15psi( P1SC know and D1SC next year). Any input is greatly appreciated-thanks!
( P1SC know and D1SC next year) Just put the F1R on it
YSI
06-08-2006, 09:28 PM
#7
That ring gap guide is funny.
It says for "Blown Race Only" to use .006" x bore size. For us that would be about .024".
After a few melted pistons on a 8 psi blown 502 using JE pistons even at low EGT's of 1200 deg F, we called JE. They said to use .030 - .050 ring gap. This fixed the problem.
I've melted and broken a few SRP pistons in my turbo motor when gapped at .024 - .026. Based on their advice, I went up to .030 and haven't had a problem since, even after an overboost incident that severely blew both head gaskets.
Mike
It says for "Blown Race Only" to use .006" x bore size. For us that would be about .024".
After a few melted pistons on a 8 psi blown 502 using JE pistons even at low EGT's of 1200 deg F, we called JE. They said to use .030 - .050 ring gap. This fixed the problem.
I've melted and broken a few SRP pistons in my turbo motor when gapped at .024 - .026. Based on their advice, I went up to .030 and haven't had a problem since, even after an overboost incident that severely blew both head gaskets.
Mike
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06-08-2006, 09:47 PM
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Are you gapping the top and second ring the same?
Originally Posted by engineermike
That ring gap guide is funny.
It says for "Blown Race Only" to use .006" x bore size. For us that would be about .024".
After a few melted pistons on a 8 psi blown 502 using JE pistons even at low EGT's of 1200 deg F, we called JE. They said to use .030 - .050 ring gap. This fixed the problem.
I've melted and broken a few SRP pistons in my turbo motor when gapped at .024 - .026. Based on their advice, I went up to .030 and haven't had a problem since, even after an overboost incident that severely blew both head gaskets.
Mike
It says for "Blown Race Only" to use .006" x bore size. For us that would be about .024".
After a few melted pistons on a 8 psi blown 502 using JE pistons even at low EGT's of 1200 deg F, we called JE. They said to use .030 - .050 ring gap. This fixed the problem.
I've melted and broken a few SRP pistons in my turbo motor when gapped at .024 - .026. Based on their advice, I went up to .030 and haven't had a problem since, even after an overboost incident that severely blew both head gaskets.
Mike
06-08-2006, 09:57 PM
#9
Originally Posted by Boostaholic
Are you gapping the top and second ring the same?
06-09-2006, 10:17 AM
#10
Originally Posted by engineermike
That ring gap guide is funny.
It says for "Blown Race Only" to use .006" x bore size. For us that would be about .024".
After a few melted pistons on a 8 psi blown 502 using JE pistons even at low EGT's of 1200 deg F, we called JE. They said to use .030 - .050 ring gap. This fixed the problem.
I've melted and broken a few SRP pistons in my turbo motor when gapped at .024 - .026. Based on their advice, I went up to .030 and haven't had a problem since, even after an overboost incident that severely blew both head gaskets.
Mike
It says for "Blown Race Only" to use .006" x bore size. For us that would be about .024".
After a few melted pistons on a 8 psi blown 502 using JE pistons even at low EGT's of 1200 deg F, we called JE. They said to use .030 - .050 ring gap. This fixed the problem.
I've melted and broken a few SRP pistons in my turbo motor when gapped at .024 - .026. Based on their advice, I went up to .030 and haven't had a problem since, even after an overboost incident that severely blew both head gaskets.
Mike
That makes me nervous....what rings were you using? I'm using Total Seal TNT non-gapless rings and their recommendation was .0055/in top ring and .004/in 2nd ring which equates to .024" and .017" on my 4.320" bore. This is going on a 10-12psi FI BBC. The machine shop should be done with the short today even.......crap! Maybe the TNT ring material won't change dimensionally as much as the ring you're using???
