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Bearing experts?? #2722367
12/07/19 06:27 PM
12/07/19 06:27 PM
Joined: May 2011
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Oakville, Wa
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Any ideas what's going on here? Front to back. Lefty to right.. This is out of my 500" turbo motor . Stock 440 block stock caps. The mains look good except the thrust bearing. The thrust faces look pretty much untouched. The rear 4 rod bearings damage I would say probably from the junk that got pumped through it at the end. Just some scratching.

01C45623-E374-4D73-B715-BE354F80281B.jpeg

67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
Re: Bearing experts?? [Re: HOTMOPR] #2722369
12/07/19 06:32 PM
12/07/19 06:32 PM
Joined: May 2011
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Oakville, Wa
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Not sure how many passes it has but it hasn't been apart some 2011. Been running 12-16ish psi


67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
Re: Bearing experts?? [Re: HOTMOPR] #2722373
12/07/19 06:39 PM
12/07/19 06:39 PM
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Bend,OR USA
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I would check the crank for run out to see on the all the main bearing surfaces to see if it is bent or not scope
I don't like to see any run out at all on any of the mains twocents
EDITED, look real closely for cracks in the main webbing between the bottom of the block cylinder walls down into the main webbing also scope I'm not trying to alarm you but better to find it, any problems, now instead of running over the crankshaft later work shruggy

Last edited by Cab_Burge; 12/07/19 06:43 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Bearing experts?? [Re: Cab_Burge] #2722379
12/07/19 06:49 PM
12/07/19 06:49 PM
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Oakville, Wa
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Ok thanks Cab. This motors race days are done. I am building a new short block for the race car. This 500 will be going in my 63 for street duty. unless the block is cracked.. lol. Ill pull the crank and get it checked too


67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
Re: Bearing experts?? [Re: HOTMOPR] #2722437
12/07/19 11:58 PM
12/07/19 11:58 PM
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Downtown Roebuck Ont
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I'm not fluent in oil flow paths on a BBM but is there any way flow can be restricted to #3 main and the front rods progressively worse front to back without scorching #1 & 2 mains? If the crank was bent I would expect at least one of the other mains to be showing some signs of stress. That one rod bearing closest to the thrust looks like it was about to go knock knock come out.

Kevin

Re: Bearing experts?? [Re: Twostick] #2722452
12/08/19 01:27 AM
12/08/19 01:27 AM
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Oakville, Wa
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ya there was a ton of build up around the dowel. Luckily it didt spin. Crank still looks great! Or great enough for me .. lol


67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
Re: Bearing experts?? [Re: HOTMOPR] #2722498
12/08/19 11:21 AM
12/08/19 11:21 AM
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MI, usa
dvw Online content
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To me it looks like the clearance was tight. When I say clearance, we've found when the crank moves those particular bearings need to be looser. The number 3 main only feeds one (#4) of the "bad rod" bearings. Maybe some taper in the #1 rod journal as well. Are all the journals the same diameter and straight? all the rod bores the same and round. Are all the rods still straight? How much clearance did they have? That's what I would be checking. My sons turbo 360 cast crank pics on the #4 main. That main runs now slightly over.004". Our bet is the cast crank looks like a jump rope under boost.
Doug

Re: Bearing experts?? [Re: dvw] #2722548
12/08/19 01:39 PM
12/08/19 01:39 PM
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fredericksburg,va
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What oiling system? How much pressure-volume? Driver side lifter galley blocked or lifters bushed? Reason, sometimes oil velocity is so much it goes by the down line to the mains if there’s big oil bleed off in the system. Those mains look oil starved

Re: Bearing experts?? [Re: HOTMOPR] #2722579
12/08/19 04:43 PM
12/08/19 04:43 PM
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Milwaukee WI
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TRENDZ Offline
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My best guess is you are starving it for oil on the launch.
Middle sump pan?
Oil climbs to the rear of the engine and splash oils the rear half of the rotating assy.
Are you logging oil pressure?


"use it 'till it breaks, replace as needed"
Re: Bearing experts?? [Re: TRENDZ] #2722581
12/08/19 04:54 PM
12/08/19 04:54 PM
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Oakville, Wa
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Yes center sump road race pan. Running 8 quarts. All the baffles are cut out. Has a single line Milodon pickup. Logs show 70-75 psi whole run.


67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
Re: Bearing experts?? [Re: HOTMOPR] #2722613
12/08/19 06:46 PM
12/08/19 06:46 PM
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Hmmm. Stumped.


"use it 'till it breaks, replace as needed"
Re: Bearing experts?? [Re: HOTMOPR] #2722614
12/08/19 07:10 PM
12/08/19 07:10 PM
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northern,Ohio,USA
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Clanton Offline
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I miss read your post

Last edited by Clanton; 12/08/19 09:56 PM.

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Re: Bearing experts?? [Re: Clanton] #2722628
12/08/19 07:52 PM
12/08/19 07:52 PM
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MI, usa
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The reason I didn't mention starvation is that not all the bearings reflect that. Normally starvation shows up towards the rear bearings 1st. Not the case here.
Doug

Re: Bearing experts?? [Re: TRENDZ] #2722652
12/08/19 09:35 PM
12/08/19 09:35 PM
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Why is it apart? Were there symptoms? Im surprised the logs never showed a change.


"use it 'till it breaks, replace as needed"
Re: Bearing experts?? [Re: TRENDZ] #2722658
12/08/19 10:15 PM
12/08/19 10:15 PM
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Oakville, Wa
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Building a new short block. I was checking bearings after the beating this block has taken. This combo has been 138-140 mph in the 1/8th mile at 3550 pounds so it been making some power I was expecting main bearing damage but not much rod bearing issues. Was planning to throw a different cam and heads on it and roll some new bearing in it. Then run it in my street car.


67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
Re: Bearing experts?? [Re: HOTMOPR] #2722659
12/08/19 10:20 PM
12/08/19 10:20 PM
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Oakville, Wa
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I did notice some light bearing material in my K&P when I was creeping up on 18 psi. So I turned it down for the last race. Assuming it was main bearing material. That's the main reason I pulled caps. As for logs there was zero change in oil pressures throughout the year.

Last edited by HOTMOPR; 12/08/19 10:21 PM.

67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
Re: Bearing experts?? [Re: HOTMOPR] #2722872
12/10/19 04:18 AM
12/10/19 04:18 AM
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I think the #3 main bearing trash mostly went into #4 rod and some of that material may have been caught a tiny bit by #3 rod work
I'm really surprised that none of the main bearing trash from the center main bearings wasn't wash into #5 rod bearing also confused
Did the motor have at least .0040 or more thrust clearances new?
Was #3 main bearing straight with no taper front to rear on the clearances?
I've seen between .0002 to .0004 taper on some of the new main bearings with block that had been align honed with new main caps and studs shockwork


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Bearing experts?? [Re: Cab_Burge] #2722880
12/10/19 08:33 AM
12/10/19 08:33 AM
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I'm guessing you are starving for oil on deceleration. Maybe rethink your oil pan and pick up??

Re: Bearing experts?? [Re: GTSocker] #2722933
12/10/19 12:37 PM
12/10/19 12:37 PM
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Fort Collins, Colorado
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Whats your engine/turbo combo? Sounds like its making some decent steam for sure!

Re: Bearing experts?? [Re: CoDart] #2723068
12/10/19 07:49 PM
12/10/19 07:49 PM
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MI, usa
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These are my questions. Why would the #3/4 rod and #3 main be hit the worst? Is the main web cracked? If there was lack of oil feed to the #3 main the #5 rod should show wear as well. #3/4 are not last in line for oil. What was the bearing clearance? Are the journals round and straight? Is the crank cracked?
Doug

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