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. |
ClayPerrine |
Oct 30 2019, 12:59 PM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,519 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
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. Use a 1.7L crank and bigger bore to increase the displacement. Shorter stroke/bigger bore allows more usable RPM with the same displacement. For example... a 76 930 engine with a 70 911S counter-weighted crank and 906 cams gives you a motor with about 2.5L, but will rev to 10K. AS explained above, it lowers the stress on the rod bearings. It is a screamer of an engine, but not very streetable. So get a 1.7L crank with counterweights, and bore it as big as possible. you can probably get 7K out of the motor. I would suggest asking Jake Raby about this. He knows more about it than I do. Clay |
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