Spun bearing on new 383 - Team Camaro Tech
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post #1 of 5 (permalink) Old Aug 18th, 03, 11:52 AM Thread Starter
Join Date: Apr 2002
Location: South Jersey USA
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I just pulled motor apart was Knocking it spun # 2 Looks like it wasn't getting any oil # 1 wasn't spun but didn't look to good when I put it together all rods came in 1.5 with plastigauge was this to tight all the other bearings look good it's a new speedomotive cast crank anybody ever have trouble with these before oil should get to 1 and 2 before the rest of the motor I had 60 lbs of oil pressure at idle before bearing spun and about 30 after any suggestions.

68 Camaro conv 454 turbo 400 86 21 Chaparall 406 sbc
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post #2 of 5 (permalink) Old Aug 18th, 03, 03:03 PM
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Location: Carlisle, PA
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In my opinion, 0.0015" is a little on the tight side. The acceptable clearance range I use is anywhere from 0.002"-0.0025" with most rod bearing clearances being around 0.0025". Also, check to make sure that your oiling holes in the crank are clean. I use Federal Mogul or Clevite 77 in my motors and have never had a problem. Everything has always checked out as far as clearances. Let us know how it works out. [img]graemlins/thumbsup.gif[/img]
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post #3 of 5 (permalink) Old Aug 18th, 03, 04:20 PM
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Location: Kentwood, MI
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.0015 is on the tight side but IMO not enough to cause a bearing to spin by itself. Not sure what oil grade you were using but with clearances that tight I'd have been using 5w30. In general, the tighter the bearing the thinner the oil should be . . .

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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle
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post #4 of 5 (permalink) Old Aug 18th, 03, 04:21 PM
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one thing to add, always use plenty of assembly lube.

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #5 of 5 (permalink) Old Aug 19th, 03, 12:46 PM Thread Starter
Join Date: Apr 2002
Location: South Jersey USA
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Thanks for the input I broke it in with 20-50 with all the moly lube and breakin lube crane gives you for the cam.I just don't know I'm going to take it out and give it to the crank guy around here to see if was getting oil to the journals and see if he can weld it and save if not its junk even if speedomotive gives me a new crank it's still another 225 to get it balanced.Iwill let you know how I make out I was more concerned with everything else clearing never thought this would happen.
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