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12-02-2012, 06:02 PM | #1 |
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8BA Rod Question
I've pulled my '40 engine, which has been updated with 8BA rods, one piece valve guides, etc.
When removing the bearing shells, I noticed that not all of the rods have the small hole drilled, which lines up with the hole in the bearing shell. I also noticed that at least one journal has a rod with the drilled oil hole. Is the theory that both shells on one journal can receive oil from one rod, or should I drill those that haven't been? Not an engine builder, but trying to learn! Any opinions would be appreciated. Joe |
12-02-2012, 06:14 PM | #2 |
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Re: 8BA Rod Question
sounds to me that someone put 8BA rods on a 59 Crank. Not a very good idea, but it works, never thought it would but the small end play allows the rod bearings to get sufficient oil.
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12-02-2012, 06:56 PM | #3 | |
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Re: 8BA Rod Question
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12-02-2012, 06:59 PM | #4 | |
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Re: 8BA Rod Question
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12-02-2012, 07:06 PM | #5 |
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Re: 8BA Rod Question
Thanks guys.....Ron, could you expand on why it's not a good idea to use 8BA rods on a 59 crank?
Joe |
12-02-2012, 07:47 PM | #6 |
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Re: 8BA Rod Question
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Tom |
12-02-2012, 08:13 PM | #7 |
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Re: 8BA Rod Question
The 99, 59, and 8BA have the same dia. crank Journals, so you can use either Floating or lock in bearings. However only the 8BA crank has the dual oil holes for the lock in bearings. It's been thought that the single hole crank could not support the lock in bearing, but the fact that the /006-8" side clearance does not affect the lubrication of these bearings. It's just not a good engineering practice to temp fate.
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12-02-2012, 09:09 PM | #8 |
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Re: 8BA Rod Question
Yea Ron, your right, I have stripped 59Ab engines and found 8BA rods on the 59 crank. The bearings looked good. but I wouldn't do it, to scarry. BTW he's talking about the squirt holes in the rods, the first couple of yr's of the 8BA didn't have squirt the holes. I wouldn't worry about not have the holes. Walt
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12-02-2012, 11:28 PM | #9 |
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Re: 8BA Rod Question
Ron, Walt.......thanks for your input.
Joe |
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