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What exactly is a "spun" bearing? What causes it?
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Curly1
DRR Top Comp
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quote:
Originally posted by 183N:


This exactly. A few years back I learned the hard way that a dragster needs a billet oil pump. At about 700’ into a run it felt like the engine “tightened up” and nosed over. I immediately took my foot out of it and shut it off. When I took it apart the melling pump pickup was laying in the pan. #1 journal on the crank got hot but luckily I clicked it off before any bearings spun. Had to turn the rod journals .010, put it back together and the crank broke at the first journal 60 passes later. No doubt due to being turned.

Now all three of our engines have Moroso billet oil pumps.


That was one thing that always worried me about Hoosier tires. The tire shake was brutal and I did not want to break oil pump.


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Posts: 4284 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
183N
DRR Sportsman
posted Hide Post
quote:
Originally posted by Curly1:
quote:
Originally posted by 183N:


This exactly. A few years back I learned the hard way that a dragster needs a billet oil pump. At about 700’ into a run it felt like the engine “tightened up” and nosed over. I immediately took my foot out of it and shut it off. When I took it apart the melling pump pickup was laying in the pan. #1 journal on the crank got hot but luckily I clicked it off before any bearings spun. Had to turn the rod journals .010, put it back together and the crank broke at the first journal 60 passes later. No doubt due to being turned.

Now all three of our engines have Moroso billet oil pumps.


That was one thing that always worried me about Hoosier tires. The tire shake was brutal and I did not want to break oil pump.


Yes!! I had Hoosiers at the time. MT on both cars now, much smoother when the tires hook at the end of the burnout.
 
Posts: 742 | Location: Upstate NY | Registered: July 02, 2013Reply With QuoteReport This Post
Alaskaracer
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quote:
Originally posted by TheBlueTruck:
quote:
Originally posted by Coloradoracer:
I was running King Hp mains, never an issue. Rods were King XP bearings. Was running them because I had mid ordered so figured they would be ok. Other racing buddy was running the same. Turns out they were delaminating then would "grab" the crank and at that point it was game over. That was my third pass on those bearings. My buddy was getting about the same, 3-5 passes before boom. King HP never an issue.


XP as in the coated bearing?



Yes.


Mark Goulette
Owner/Driver of the Livin' The Dream Racing dragster
www.livinthedreamracing.com
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Posts: 1540 | Location: Back home in Alaska! | Registered: February 13, 2011Reply With QuoteReport This Post
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