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Does king make a +.001 bearing? I couldn't find any and std hp's are at .0045 on my mains when I checked today. Picked up some coated clevites a few minutes ago.
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I went through all of the bearing questions a year ago when I built my shortblock - traded a lot of emails with they guys in Mahle-Clevite's tech support department. For the most part, in marine engines the general consensus is still .0025 - .0028 on rods and around .0030 on the mains - most also like to run a little more clearance in that rear main as well, maybe around .0035. I am not going to begin to claim to be an expert, but I did communicate with several highly respected builders around these forums, and there are some who are starting to move away from large clearances with high volume oil pumps and heavy weight oils and more in the direction of tighter clearances with lower oil pressures and lighter weight synthetic oils. That's not to say that your engine is not going to live if you run the wider clearances, but the thinking is that it might not really be necessary to put so much pressure on the distributor drive gears and use up extra HP to run 50 weight oil at 90 PSI. I'm sure there are going to be many differing opinions on this (much like camshafts).
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Originally Posted by lil red
(Post 4064868)
Does king make a +.001 bearing? I couldn't find any and std hp's are at .0045 on my mains when I checked today. Picked up some coated clevites a few minutes ago.
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The crank is 2.748, so the my guess is the bore is a little loose. Ill have to measure the bore tomorrow and make sure there is sufficient crush.
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AFR 315 Heads
victor Jr 950HP 10.5 to 1 Dyno Headers 715HP at 6000 697#/ft 91 Octane California 296/300 237/241 206/208 154/151 96/75 .363/.335 103/111 |
Originally Posted by lil red
(Post 4064932)
The crank is 2.748, so the my guess is the bore is a little loose. Ill have to measure the bore tomorrow and make sure there is sufficient crush.
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Originally Posted by Budman II
(Post 4064915)
I went through all of the bearing questions a year ago when I built my shortblock - traded a lot of emails with they guys in Mahle-Clevite's tech support department. For the most part, in marine engines the general consensus is still .0025 - .0028 on rods and around .0030 on the mains - most also like to run a little more clearance in that rear main as well, maybe around .0035. I am not going to begin to claim to be an expert, but I did communicate with several highly respected builders around these forums, and there are some who are starting to move away from large clearances with high volume oil pumps and heavy weight oils and more in the direction of tighter clearances with lower oil pressures and lighter weight synthetic oils. That's not to say that your engine is not going to live if you run the wider clearances, but the thinking is that it might not really be necessary to put so much pressure on the distributor drive gears and use up extra HP to run 50 weight oil at 90 PSI. I'm sure there are going to be many differing opinions on this (much like camshafts).
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Originally Posted by Black Baja
(Post 4064939)
Are you using a bore gauge and a mic to get your measurements? I'm pretty sure king makes a +1
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cstraub thank you that's the kind of reply I was looking for.
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Originally Posted by johnnyboatman
(Post 4065165)
thank you that's the kind of reply I was looking for.
Main thing that should stick out is the 107LSA. (103/111 centerlines = 107LSA) Would you put that in an I/O Offshore boat ? I think not. |
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