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How hard is it to spin a main bearing?

This is a discussion on How hard is it to spin a main bearing? within the Internal Engine forums, part of the LSx Technical Help Section category; I know a kid who spun the main bearing in his lt1 like 5 years ago, and was was wondering ...

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    Member Daniel P.'s Avatar
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    How hard is it to spin a main bearing?

    I know a kid who spun the main bearing in his lt1 like 5 years ago, and was was wondering how hard it is to do, and how how can you tell if you have?

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    Senior Member ss~zoso~ss's Avatar
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    do a burnout at redline for 1 minute, that'll do it, i think as long as you keep your oil changed, run premium fuel , keep up on the basic maintenance and it'll be really hard to do

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    Using heavy oil to boost pressure can starve the bearing surfaces under high load conditions, especially in an engine that has not been fully warmed. Using the proper weight oil and a synthetic if the engine is pretty leak free makes for good insurance. The LT1 has had a reputation for this but not to the extent of considering it common.

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    Member Daniel P.'s Avatar
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    so if I do a donut and bounce it off the limiter a little it wont cause any permanent damage?

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    Pistol Pete '96 Z28SS's Avatar
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    just dont get into a habit of it, limiters are there for that reason

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Daniel P. View Post
    so if I do a donut and bounce it off the limiter a little it wont cause any permanent damage?
    dont do donuts..its hard as hell on the rear more then the engine, yea i know they are sweet but your rear taking a major shit and you just there not being able to moke isnt.. take care of the 10bolt ..alot

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    O U 8 1 2 Spaz's Avatar
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    floor it at like 500 rpm going up a hill and change gears keeping the rpms really low...

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    Member Daniel P.'s Avatar
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    ok thanks for the info guys, and i'll lay off the rear end for a while

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    Member Thorazine Shuffle's Avatar
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    Quote Originally Posted by 01Z28M6 View Post
    Using heavy oil to boost pressure can starve the bearing surfaces under high load conditions, especially in an engine that has not been fully warmed. Using the proper weight oil and a synthetic if the engine is pretty leak free makes for good insurance. The LT1 has had a reputation for this but not to the extent of considering it common.

    I did that in a '79 malibu w/ a 327 I used to have. I was in the pits at IRP between rounds, and my engine started squealing like a belt slipping. Before we could figure out what it was, it quit. Long story short, My next pass a main bearing seized, and broke the crank. I was just about to hit 2nd gear @ 7800rpm when it snapped. Needless to say once I got it stopped I looked back , and saw most of the shortblock internals laying on the track...

    By the way, I had just put straight 50 weight Valvoline in it that morning, because I noticed my oil pressure wasn't as high as it used to be....

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    Senior Member ss~zoso~ss's Avatar
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    Quote Originally Posted by The Real Spaz View Post
    floor it at like 500 rpm going up a hill and change gears keeping the rpms really low...
    no no no, that will bend your pushrods

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    I don't know how hard it is to do but I did last Saturday. I ran up to 132 mph in drive and shifted to O/D and I noticed that the oil pressure dropped from the normal 40-45 lbs it held most of time to about 12 lbs. I have 118000 on mine and I changed the oil and filter every 3000 miles and I ran full syn. Like the guys said prior to me stay away from the donuts it does kill the rear. As for the rev. limter it is there for reason normal small blocks are good for 6000 rpm but after that they are crying.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Black96Lt1 View Post
    6000 rpm but after that they are crying.
    i believe they are screaming to stop not crying...

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    hunter Green
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    doesnt nascar use small blocks? yet those bitches rev to 10k

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Krazy351w View Post
    doesnt nascar use small blocks? yet those bitches rev to 10k
    but i also believe that they rebuild the engines every race. so even for a race engine the tear of going 10k is intense.

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    Local Bum TARZAN's Avatar
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    crying and screaming after 6,000? I revved my 4.6 2V to 7,000, and I rev my stock shortblock LS1 to 7,000.....


    -Will

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    Quote Originally Posted by ss~zoso~ss View Post
    no no no, that will bend your pushrods
    How does it bend push rods? heavy load on the engine at low rpm should affect the pushrods at all

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by TARZAN View Post
    crying and screaming after 6,000? I revved my 4.6 2V to 7,000, and I rev my stock shortblock LS1 to 7,000.....


    -Will
    cool. these engines dont like too high of rpms.

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    Evr sena bdgr killa snak? Roastem's Avatar
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    Who told you that slim shady?

    I rev mine to 6600 ALL the time.

    I heard the weak point was the rod bolts and they are "supposedly" needed for a lot of 7K use.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Roastem View Post
    Who told you that slim shady?

    I rev mine to 6600 ALL the time.

    I heard the weak point was the rod bolts and they are "supposedly" needed for a lot of 7K use.
    i was refering to 7k+ i've herd it around. for a stock engine. unless i'm wrong.

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    Evr sena bdgr killa snak? Roastem's Avatar
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    That is what I call turnin' and burnin'. I remember back when you had to dump a LOT of money in a 350 to get it to turn 7K reliably. The LS1 changed everything.
    Last edited by Roastem; 11-27-2006 at 12:41 PM. Reason: me none too smart

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