pics of my bearings for the 408
#1813850
04/28/15 01:32 PM
04/28/15 01:32 PM
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Joined: Jan 2007
Posts: 8,041 Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,041
Mt Morris Michigan
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the bearings are set up L to R #1 main thru #5 and same on rods L to R. uppers are at top and lowers on bottom. they have about 40-50 passes and 1500-2000 miles i'm guessing. what do you think? did they get enough oil and especially #1 main and rod?
Last edited by mopar dave; 04/28/15 02:27 PM.
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1813952
04/28/15 03:51 PM
04/28/15 03:51 PM
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Joined: Aug 2003
Posts: 43,204 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,204
Bend,OR USA
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The rod bearing look good to me I would check the actual run out on the # 2 and #4 crankshaft mains to see what is causing those two main bearings to look like they do I've seen more than one SB crankshaft have run out on the #2 main Let us know what you find out
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1814440
04/29/15 08:53 AM
04/29/15 08:53 AM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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the upper rod bearings look to be more worn in the center while the lowers appear to be more worn on the outside edges. i'll have to mic the crank when I get time. The upper rod bearings should be the only ones showing wear, the lowers are just along for the ride. Hows the rod bearings crush? I bet not good?
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1814553
04/29/15 01:28 PM
04/29/15 01:28 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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[code][/code] the bearings are set up L to R #1 main thru #5 and same on rods L to R. uppers are at top and lowers on bottom. they have about 40-50 passes and 1500-2000 miles i'm guessing. what do you think? did they get enough oil and especially #1 main and rod? If my bearings looked like that after the amount of use you described above, I'd be concerned about the source of the problem. The rods look "so-so" at best, and a couple of those crank bearings just plain look bad, maybe like temporay oil starvation. Not sure I can add any more to what others have said. I, too, suspect the crank has issues, but would want to verify there are no obstructions in the oiling passages, etc.
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1814598
04/29/15 03:04 PM
04/29/15 03:04 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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I don't understand that last comment. ANY positive displacement pump oils by rpm. The flow out of the pump is directly proportional to the pump speed, which is directly proportional to crankshaft speed. EVERY engine wet sump oil pump is a positive displacement pump. I believe all of the dry sump pumps are as well. It could be possible to use a centrifugal pump, but operating characteristics of a centrifugal pump don't match engine lubrication needs very well.
I do not understand why you would say that a Melling pump would be all done by 3000 rpm. Melling makes most of the oil pumps that are sold for the US market. There is nothing about the design of a Melling pump, or any engine oil pump of which I am aware, that would make that happen.
On the other hand, if the oil pickup tube is constricted, or if the oil gets all foamy above 3000 rpm, then something like what I think you are describing is possible, due to cavitation.
R.
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1814665
04/29/15 05:15 PM
04/29/15 05:15 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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Well, I'm curious what you're talking about, too.
As far as I know, every fluid pumping system is going to have flow limitations set by the size (restriction) of the passage(s), the viscosity of the fluid being pumped, the max free-flow volume of the pump, the max volume of the pump working against some set pressure (a product of the fluid's viscosity and that restriction), and any pressure-based blow-off limitation built into the system.
If the existing pump is already pushing the max capacity of fluid given the system's internal restrictions, and in the processs also hitting the peak pressure estabilished by the blow-off mechanism, then the only thing another pump could do differently is create more pressure from using a higher blow-off setting. However, the volume of fluid wouldn't increase signficantly past a certain point due to the limitation mentioned above.
Volume improvements under that scenario would need to come from enlarging the internal passage, not from trying to force-feed more oil through the same size passage.
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Re: pics of my bearings for the 408
[Re: Porter67]
#1814783
04/29/15 08:22 PM
04/29/15 08:22 PM
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Joined: Jan 2007
Posts: 8,041 Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,041
Mt Morris Michigan
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MRL Performance. I agree and know nothing more than I already mentioned. I think melling is a great pump but there is better. Titan but do I want to spend $800 for it. No. The pump mike has is said to be easier on bronze gears and is worth a few hp and feeds oil depending on rpm. I built this engine and best machine did most of the machine work. It went 8 years with 40 to 50 passes and some street miles.
Last edited by mopar dave; 04/29/15 08:33 PM.
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1814786
04/29/15 08:31 PM
04/29/15 08:31 PM
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Joined: Jan 2007
Posts: 8,041 Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,041
Mt Morris Michigan
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Not claiming to be a pro engine builder. Just a hobbies with 6 engines built and no major failures. My tools are not the most expensive but get the job done. Craftsmen. My knowledge comes form this site as well as mopar performance books and other professional engine builders. The engine block and all components are getting checked and machined properly. Nothing gets throw together in my garage without getting checked and machined.
Last edited by mopar dave; 04/29/15 08:35 PM.
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1814878
04/29/15 10:03 PM
04/29/15 10:03 PM
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Joined: Feb 2005
Posts: 20,179 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,179
PA.
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Don't out-trick yourself with trickery. I just took my engine apart after four years (2 years pump gas, 2 year alcohol) and my bearings looked GREAT. 35 dollar melling standard volume, standard pressure pump.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: pics of my bearings for the 408
[Re: pittsburghracer]
#1814885
04/29/15 10:12 PM
04/29/15 10:12 PM
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Joined: Feb 2005
Posts: 20,179 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,179
PA.
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To add to this I will never use a Canton oil pan on my small block again without modifying it. I bought one after seeing how nice the small block Chevy one was when I built an engine for a Friend. The Mopar one was a piece of JUNK compared to it and my oil pressure was dropping like a turd when I left the line. I put it on hoping it would give me more room than my Milidon did with the 1 7/8 Hedmen headers so I could use a diaper. NEVER again and thank God for my Racpak or I may have not caught it.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1814930
04/29/15 11:05 PM
04/29/15 11:05 PM
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Joined: Mar 2006
Posts: 9,844 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,844
MI, usa
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.002 on both rods and mains. Used main studs. Had a local shop hone the mains. Eagle forged crank and rods. Moroso pan. Don't know how it was balanced but the guy that did it has a great rep. Brad Penn oil and now amsoil dominator 15/50. How much pressure? To me .002 with 15/50 is tighter than I would run. Personally most of my stuff is about .0027-.0029 and I run 5w30. Doug
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Re: pics of my bearings for the 408
[Re: mopar dave]
#1814938
04/29/15 11:15 PM
04/29/15 11:15 PM
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Joined: Jan 2003
Posts: 11,713 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,713
Portage,michigan
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Dave.... Did you say you used the Melling pump that a company called Precision blueprints? Ran one of them in my old W5 motor and thought it was up to snuff. I would be extremely suspect of a 180 dollar miracle oil pump, as I am sure you are as well.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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