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Old 04-18-2013, 12:33 PM
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Engine Bearings Failure (again) BBC 555CI, OFFROAD

Hello , i have a edelbrock/musi 555 697hp engine, its a Big Block Chevy with DART BIG-M BLOCK, i have a problem with it, it keep failing main bearings, it's the third time in less than 3k Miles, i use this engine for offroading (hillclimbing in sand) i use 0.0023-0.0025 clearance on main bearings on the last rebuild, the engine see big load and like 6000-6500rpm for a long period, im using liquimoly 10w-60 oil, i was using clevite HNK Bearings, i was thinking it isn't too much clearance for aplication?, but i dont know how much is ok.

Sorry about mistake on my english, hope someone can help me

Thanks

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Old 04-18-2013, 02:28 PM
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Hi.
Why don't you contact Pat @ Pat Musi Racing Engines or call him #704-664-7051.
& explain your problem, I know Pat, & he would be more then willing to help
you out.
Rich
www.patmusi.com
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Old 04-18-2013, 03:46 PM
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I already do that, i send the engine to him from my country Chile, He send it back and it last like one month and fail again, i cant sens it to him again cause with the shipping and repair cost is the same as buy a new one , any other help?

pd: this is a edelbrock/musi 555
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Old 04-18-2013, 04:14 PM
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60 weight oil is the wrong oil for this or any other automotive engine.
A 10w 30 oil will protect the bearings better. thick oil does not protect bearings better.
lack of fuel octane will pound the bearings., too.

you had best learn how to build and maintain you own engines.
best look at all the rods too.

If the bearings are loosing oil pressure (hill climbing), you had best address that too.
(Dry sump oil system, Moroso oil accumulator.

you probabily need to now precision line hone the mains. Start by measuring. Buy the tools.
Find someone there that can do that. (local HD diesel truck-industrical-marine engine rebuild shop) Buy some machinists measuring tools.
Where do the local GM/Ford/Chrysler car dealers/service department there get their machining done?
Whre do the local diesel truck shops get there machining done?

Last edited by F-BIRD'88; 04-18-2013 at 04:28 PM.
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Old 04-18-2013, 04:58 PM
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thanks for answer f-bird, i line hone mains with a machine shop here in my city, a good one so no doubt about they job, they also measure al the clearance of the engine.

Maybe is the Oil i was using on it. But i have two SBC for offroad one with a blower 177, 388ci 7psi, and i use the same oil and i dont have any problems on it, and the other is just a 350 with some mods, and i dont have anyproblems too.

On the BBC i put a lot A LOT, of atention all the time on oil press gauge, and it never get off. So i was thinking about too little clearance for the application i use, i guess maybe oil get too hot and the journal expand more than clearance and bearing start to fail?

Thanks a lot for help me.
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Old 04-18-2013, 05:10 PM
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If the crank shaft is straight the clearance should be plenty.
If its not straight.....well...
Detonation will pound the bearings too.
60 oil is too thick for any auto motor. All you engines will perform better and last longer with a thiner oil.

Don't know were you got the idea of 60 weight oil for theses motors.

It is easy to check a crank for straightness across the mains.
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Old 04-18-2013, 05:19 PM
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i also check crank last time i rebuild, and i have to get it to 0.010 to get it straight, so you think the oil is causing my problem?, no way about clearance?

No detonation, i was using a msd knocking detector
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Old 04-18-2013, 05:28 PM
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you said hill climb
on top of the oil issue..
look at your oil pan and pick up.. they are not made to be going up inclines like that at that rpm for that long..
even drag cars it's only a few seconds with nose up..
you didn't say you where running a dry sump oil system..
but I'm willing to bet that 1/2 the issue is you having the oil pick up sucking air.. and like f-bird said wrong oil..
you may need a oil pick up that, picks up at the back at the rear pan wall and floor.. and not just dead center of the sump floor.. as the oil is always running toward the rear wall on those inclines.. and you might be sucking the pan dry..
I'd also add an oil Accumulator

Moroso : Category Display

hope this helps.
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Old 04-18-2013, 05:38 PM
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Quote:
Originally Posted by gearheadslife View Post
you said hill climb
on top of the oil issue..
look at your oil pan and pick up.. they are not made to be going up inclines like that at that rpm for that long..
even drag cars it's only a few seconds with nose up..
you didn't say you where running a dry sump oil system..
but I'm willing to bet that 1/2 the issue is you having the oil pick up sucking air.. and like f-bird said wrong oil..
you may need a oil pick up that, picks up at the back at the rear pan wall and floor.. and not just dead center of the sump floor.. as the oil is always running toward the rear wall on those inclines.. and you might be sucking the pan dry..
I'd also add an oil Accumulator

Moroso : Category Display

hope this helps.
Thanks for answer, Pat Musi already put me a pan and pickup for the offroad aplication, i can get some pictures tomorrow and put them here, about accumulator i was looking at ACCUSUMP, is the same thing you linked?
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Old 04-18-2013, 06:13 PM
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im using this oil pump (the model that comes with the engine)
http://www.summitracing.com/parts/me...make/chevrolet
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Old 04-18-2013, 06:32 PM
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How did you measure clearances down to individual 10 thousands place?
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Old 04-18-2013, 06:35 PM
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Quote:
Originally Posted by spinn View Post
How did you measure clearances down to individual 10 thousands place?
I Dont understand the question, sorry.

The Machine shop measure the main and rod bearings clearances
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Old 04-19-2013, 01:40 PM
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.003 on the mains might help keep the bearing cooled better.

I would go to a 10-40 or 15-40 oil.

I would think about an oil cooler along with the Accusump, or even a one or two stage dry sump

I would consider trying the 3/4 grooved main bearings.
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Old 04-19-2013, 02:17 PM
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No detonation, i was using a msd knocking detector

This does not mean the engine was not detonating. This engine is used under heavy load.
and probably gets hot in competition. Start by looking at the fuel you are using.

Cheap gas DOES NOT SAVE YOU MONEY on a competition race motor.
You could have a perfect built motor and pound the bearings out of it just by using cheap gas.
Start here...
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Old 04-19-2013, 06:03 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
No detonation, i was using a msd knocking detector

This does not mean the engine was not detonating. This engine is used under heavy load.
and probably gets hot in competition. Start by looking at the fuel you are using.

Cheap gas DOES NOT SAVE YOU MONEY on a competition race motor.
You could have a perfect built motor and pound the bearings out of it just by using cheap gas.
Start here...
i was using the best fuel here in my country, 97 OCT, engine have like 9.8:1 compression
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