threw another #3 rod, how to prevent this from happening again. |
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threw another #3 rod, how to prevent this from happening again. |
crash914 |
Oct 29 2019, 03:17 PM
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#1
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its a mystery to me Group: Members Posts: 1,826 Joined: 17-March 03 From: Marriottsville, MD Member No.: 434 Region Association: MidAtlantic Region |
So blew up my #3 rod. wondering what caused this. lack of oil, due to rpm? poor return? oil pump sucking air?
last time it was #2 rod. I really don't want to live with this again. Motor specs, Dual oil coolers with full flow plumbing 102 bore by 80mm stroke long rods, ham heads and valve train. Running to 6800 rpm g loads to 1.5 windage tray modified at pushrod tubes for oil flow tuna can with 1/2 extra oil Pics of horror below. First are this failure, then old failure. |
crash914 |
Oct 30 2019, 10:53 AM
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#2
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its a mystery to me Group: Members Posts: 1,826 Joined: 17-March 03 From: Marriottsville, MD Member No.: 434 Region Association: MidAtlantic Region |
I accept the responsibility for the failure. No need to run it in.
What I would like to generate is what to do to have a high rev engine live more than 20 hours? Bearing coating? Super secret windage tray mods? Better balance? Lots of folks build big bore motors, hopefully we can help them with longevity. |
jd74914 |
Oct 30 2019, 12:28 PM
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#3
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
I accept the responsibility for the failure. No need to run it in. What I would like to generate is what to do to have a high rev engine live more than 20 hours? Bearing coating? Super secret windage tray mods? Better balance? Lots of folks build big bore motors, hopefully we can help them with longevity. Dry sump with a few suction points... It would be interesting to measure and log gallery oil pressures at high speed and see what happens in relation to lat./long. acceleration. As noted, there is likely a story on the bearing overload side which is related to oil pressure. |
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