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. |
Chris914n6 |
Oct 29 2019, 11:14 PM
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#2
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Jackstands are my life. Group: Members Posts: 3,328 Joined: 14-March 03 From: Las Vegas, NV Member No.: 431 Region Association: Southwest Region |
I can't think of a motor with nearly a 4" bore that turns more than 6k.
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rick 918-S |
Nov 1 2019, 06:49 AM
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#3
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Hey nice rack! -Celette Group: Members Posts: 20,473 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
I can't think of a motor with nearly a 4" bore that turns more than 6k. (IMG:style_emoticons/default/agree.gif) check your connecting rod ratio to assist in cakculating you approximate RPM range. The long rods should allow for higher RPMs but the size of the Piston may be causing the inertia to jerk the bolts apart. My BMW 2002 had a con rod ratio of 1.6875 which translates to 6875 RPM's at an extended 7200 the harmonics and piston inertia would pull the rod bolts apart. Ok for short bursts but really a grenade waiting to happen. |
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