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| Main Bearing Shells / Crank main Oiling https://slantsix.org/forum/viewtopic.php?t=38113 |
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| Author: | Greg Ondayko [ Fri Nov 27, 2009 1:07 pm ] |
| Post subject: | Main Bearing Shells / Crank main Oiling |
I have read in an old Hyperpack manual From chrysler, published in the early sixties to use 2 sets of the upper bearing shells to improve crank oil flow. Has anyone done this? Are the main Bearing shells sold now still having the groove on them in the upper shell? Thanks alot! Greg |
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| Author: | Shaker223 [ Fri Nov 27, 2009 2:03 pm ] |
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I tried this but the tang is in the wrong position to do this. You would have to have the cap machined to accept the bearing in the correct spot. Rather than buy two sets of bearings. I had a grove cut into my crank. |
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| Author: | Exner Geek [ Fri Nov 27, 2009 7:09 pm ] |
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It is not very difficult to widen the slot in the bearing cap with a file to properly locate the grooved bearing half. I do this on any engine that is expected to exceed 6000RPM. You do tend to accumulate a lot of ungrooved bearing halves though. It would be nice if someone could figure out how to cut a suitiable groove in the lower half. |
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| Author: | Charrlie_S [ Sat Nov 28, 2009 5:17 am ] |
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I do like Seymour and widen the notch in the bearing cap. I did try to put a groove in the lower bearing shell, with a "cutoff" wheel. It looked like it was done by a drunkin sailor, but I used it anyway, and it is still running. I would think it possible to make a fixture to mount the bearings in a lathe, and cut the groove that way. |
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| Author: | Greg Ondayko [ Sat Nov 28, 2009 9:05 am ] |
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Quote: I tried this but the tang is in the wrong position to do this. You would have to have the cap machined to accept the bearing in the correct spot. Rather than buy two sets of bearings. I had a grove cut into my crank.
Okay, Thanks guys - I will buy 2 sets of bearings - The Hyper pack manual says to file off the tang on one bearing and it will work correctly.Greg |
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| Author: | Charrlie_S [ Sat Nov 28, 2009 12:05 pm ] |
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The problem with filing the tang, if you leave it just slightly high, it will mess up the bearing to crank clearance. Then you also have to do it to evry set of bearings you install. Renotch the cap, once and done. |
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| Author: | Greg Ondayko [ Sat Nov 28, 2009 1:15 pm ] |
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Makes Sense Charrlie. Thanks! Greg |
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| Author: | RustyRamcharger [ Sat Nov 28, 2009 3:49 pm ] |
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Take a look at my earlier post: http://www.slantsix.org/forum/viewtopic.php?t=38006 Grooving the lower bearing shell improves oiling to the rod bearings, however the load on the main bearing oil film increases dramatically, as does drag. Best results are with an ungrooved lower shell. Ken 
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| Author: | Shaker223 [ Sat Nov 28, 2009 5:57 pm ] |
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For the little bit of drag involved, I'd rather have the extra oil at the rods. |
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| Author: | Doctor Dodge [ Sat Nov 28, 2009 6:07 pm ] |
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On high RPM race engines, I tend to add a short 'lead-in' groove to get the oil past the parting line and smoothly into the lower bearing shell. Doing this keeps the oilstream from 'hitting a wall' where it meets the edge of the un-grooved bottom bearing shell. I only go into the bottom shell about 1/4 of an inch, from both edges and taper the grooves out onto the bearing 'flat' somewhat quickly. In general, these areas of the main bearings, near the parting line, have more clearance and carry little to no load. DD  
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| Author: | Greg Ondayko [ Sat Nov 28, 2009 6:52 pm ] |
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Thanks again Slant six Sages! Greg |
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