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#1
09-18-2020, 07:22 AM
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Wow! 10 minutes of main Bearing run time on just assembly oil is a bit more then I would have thought.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#2
09-18-2020, 09:22 AM
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The ten minutes was an estimate, I was not there. Could have been 6-7 minutes. It ran at steady speed breaking in the new camshaft. I guess break-in lube, no to little load, and some splash lube kept it going for a while.
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#3
09-18-2020, 08:15 PM
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I’m anxious to hear the assessment of the crank journal. I have a forged Scat 4.25” myself, although it’s for 3” mains. Still in the box, but I will go over it with the proverbial fine toothed comb.
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Hoping to finish a project while I'm still able to push the clutch in....  1963 Tempest Convertible (Ram Air IV w/4” stroke), TKX, 9-inch w/3.70 gears and triangulated 4-link) Pictures |
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#4
09-18-2020, 08:39 PM
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I have seen allot of Pontiac engine failures over the last 40+ years but NEVER a failure on the #5 main bearing alone. That is a bizarre failure and I am sorry you had to be the one to have it happen. I am also sorry to hear a Scat forged crank may be the cause because I am building an engine with one as well. Disappointing situation for sure but it looks like you have a good shop dealing with it and it will be corrected.
From the few pics provided, it looks like the oil slinger area and the radius is the problem. It looks like the slinger is not riding in the center of the groove and has little radius. If it was rubbing in the block or cap that would make allot of heat and ferrous debris quickly.. Last edited by mgarblik; 09-18-2020 at 08:47 PM. |
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#5
09-29-2020, 12:14 AM
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Quote:
A Mopar got dragged out of a Treasure Yard, drained of oil, and idled. Bets taken on how long before it "blew up". When folks got bored, they put a brick on the gas pedal, not enough to achieve WFO, but beyond "fast idle". Most folks went home before it seized. God bless the Leaning Tower of Power. |
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