Re: Rod bearing pic
[Re: Clanton]
#1543729
12/04/13 05:50 PM
12/04/13 05:50 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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My guess is accelerated wear due to poor journal finish. You got others that look like that?
Fastest 300
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Re: Rod bearing pic
[Re: Clanton]
#1543730
12/04/13 06:15 PM
12/04/13 06:15 PM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
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any chance you could take a picture with better lighting and also a picture of the back of the bearing shells? From what I see it doesn't look good, that's for sure.
machine shop owner and engine builder
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Re: Rod bearing pic
[Re: Crizila]
#1543731
12/04/13 06:53 PM
12/04/13 06:53 PM
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Joined: May 2011
Posts: 4,489 northern,Ohio,USA
Clanton
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The oil had some carbon in it from a rich tune so that may be the finish issue you think you see.Or maybe not but the crank was fresh from Moldex.The back of the bearings show no sign of knock.[like new] ps:I made about 40 passes on this engine.
Last edited by Clanton; 12/04/13 06:55 PM.
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Re: Rod bearing pic
[Re: Clanton]
#1543732
12/04/13 07:02 PM
12/04/13 07:02 PM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
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A better picture would sure help, even if it had carbon in the oil. It looks like you have an uneven wear pattern that goes all the way to the parting line. Or maybe it's just that the pic is so dark I can't really tell.
machine shop owner and engine builder
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Re: Rod bearing pic
[Re: Performance Only]
#1543733
12/04/13 07:11 PM
12/04/13 07:11 PM
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Joined: May 2011
Posts: 4,489 northern,Ohio,USA
Clanton
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I will work on a better pic.I wonder if the pattern is from the rod walking back/forth on the crank..003 clearence,.025 side,15/40 oil,hv pump,80 psi.
Last edited by Clanton; 12/04/13 07:12 PM.
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Re: Rod bearing pic
[Re: Clanton]
#1543734
12/04/13 07:15 PM
12/04/13 07:15 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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Quote:
I will work on a better pic.I wonder if the pattern is from the rod walking back/forth on the crank..003 clearence,.025 side,15/40 oil,hv pump,80 psi.
Actually, that's a pretty good pic. Polish the crank, fresh bearings, and party down. Again, do the other bearings look like that?
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Re: Rod bearing pic
[Re: Clanton]
#1543736
12/04/13 10:29 PM
12/04/13 10:29 PM
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Joined: Jan 2003
Posts: 5,762 Hot Rod Ridge
FastmOp
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I like to take a ball bearing and a 0-1 micrometer and measure the upper bearing shell. You can measure the crush and tell if it had detonation. Anything more then a couple tenths (.0002) and the tune up is too close to the edge. If it measures the same as the bottom 1/2 just wipe those off with a wore out green pad and reuse them I don't really like .003 for clearance. I'd want .002 but I'm no expert.
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Re: Rod bearing pic
[Re: jamesc]
#1543740
12/05/13 11:55 AM
12/05/13 11:55 AM
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Joined: May 2011
Posts: 4,489 northern,Ohio,USA
Clanton
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Quote:
i'd want to know why that cap insert is worn on one side.
I posted the pic to find that out if I can.I can not measure the crank with the engine in the car very easy but all rods & bearings were measured with a good bore gauge to begin with.
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Re: Rod bearing pic
[Re: Crizila]
#1543742
12/05/13 12:27 PM
12/05/13 12:27 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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I wont say anything till I see the others... but the one edge looks like it doesnt have the radius for the crank or enough radius for it
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Re: Rod bearing pic
[Re: Performance Only]
#1543743
12/05/13 12:45 PM
12/05/13 12:45 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
From what I see it doesn't look good, that's for sure.
And that's the only comment I feel qualified to make on this subject.
I've run lesser powered engines far longer and the bearings from those engines -- while not ideal -- came out with much more consistent wear characteristics.
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Re: Rod bearing pic
[Re: Clanton]
#1543747
12/05/13 01:27 PM
12/05/13 01:27 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Quote:
I wont say anything till I see the others... but the one edge looks like it doesnt have the radius for the crank or enough radius for it
The radius on the bearings were turned down to clear the crank.[SLP-8-7135ch .010] I will try to do 2 more rods on another crank throw.
Did you verify that they clear the fillet... put a slight side pressure on the rod and use a feeler gauge between the crank and rod... I had to cut the bearings on a couple of my engines and at first I thought I had it till I checked it with the feeler gauge and had to go back and add more
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