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Author Topic:   Blew good motor, gotta bring out the old back up
Scoot
Member
posted June 18, 2004 11:43 PM
I blew my new motor, gotta pull it out and try to figure out what caused it. I've got my short block from last year that I'm going to just stick my heads and intake on it if there isnt anything wrong with them. My question is what should I do to this thing? Its the first motor I ever built and its ran 1 1/2 seasons with no problems. I'm afraid not to check bearings and put a new set of rings in it. But I'm afraid to tear it apart and screw the reliability up. Whats the opinions? I plan on just running it long enough to get the other one repaired.

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Scoot
Smith Racing Team
870-365-5989


way2fast72
Member
posted June 19, 2004 06:50 AM
It never bothered me to install new rings,dont really like the idea of putting new bearings on a used surface,if the bearings look OK I personally would not change them.just my opinion.


eenfield
Member
posted June 19, 2004 10:28 AM
If it has been stored right, and there was nothing wrong when it came out, then there should be no need to mess with it. Sure go ahead and check your bearings, just make sure you replicate the torque process correctly. Like if you have ARP bolts, they are different from stock.


Scoot
Member
posted June 20, 2004 04:57 PM
As I was taking the spark plugs out of the blown motor, the ends of 5 and 6 were broken off. As I tore the intake and heads off. The piston in #5 was totally trashed, the rod was bent, and caused problems with the cylinder wall of #6. The cam was broke and it looks like it tried to come out of the back of the block. Lifters were broke in half bent pushrods etc. etc. What would cause this to happen? I wasnt watching the oil pressure but after watching the race tape the car was smoking very bad. It was running very good, I didnt know anything was wrong until it blew up.

Another question, the block is not cracked, just two cylinders are damaged. Its a 60 over block, can it be sleeved?

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Scoot
Smith Racing Team
870-365-5989


Raz_900
Member
posted June 20, 2004 05:25 PM
quote:
Originally posted by Scoot:
What would cause this to happen?

Another question, the block is not cracked, just two cylinders are damaged. Its a 60 over block, can it be sleeved?


If the cam snapped, it's probably from the bend rod hitting it or parts of the pistons crunching in between. Or, it siezed in the bearings, but you'll have to get it out to see if that's the case.

A bend rod and tips of plugs blown off are usually signs of severe detonation. If it was smoking, it could have been letting oil into the chambers which greatly increases the risk of detonation. Or, it was leaking coolant from a headgasket and finally hydraulic'd the cylinder bending the rod. But, I'm gonna go with the oil, detonation, bent rod, broken piston, snapped cam series of events.

As for a .060" block being sleeved? Ummm.. unless it's a splayed cap block I wouldn't even take the time to tear it completely apart. Salvage the couple good pistons, oil filter adapter, maybe timing chain and dipstick tube. The rest is s****. If the rod bent, the crank probably wasn't real happy either. I'd be willing to bet it's cracked or bent as well.

Good luck!! Hope things work out with the backup. As above, if it was working when pulled and stored properly, clean it off and put it back together.



Scoot
Member
posted June 20, 2004 06:26 PM
Thanks for the input guys, I just took the oil pan off and looked at it and didnt appear to be anything wrong, very very clean. I'm gonna have the heads looked at tomorrow. I think I have some bent valves, other than that I hope it will make it till the end of the season.

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Scoot
Smith Racing Team
870-365-5989


Flanndad
Member
posted June 21, 2004 05:35 AM
Kind of sounds like what happened to my new motor last year.
Did you have Keith Black pistons in it?
If you did, they have a certain gap the top ring needs. If not set right, it will blow the top off of the piston.


Scoot
Member
posted June 21, 2004 08:42 AM
No they were SRP Flyweight two valve relief pistons if I remember correctly. I had the short block professionally built.

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Scoot
Smith Racing Team
870-365-5989


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