rod stretching carnage.
if i didnt know any better i would say your bolt backed out but wtf doesnt seem possible. Seems like the main bearing lower was the first to fail, and with it the rest. I wonder if some loctite or lock washers etc would have helped in that case?
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It's common knowledge in the engine building world not to use lock washers or loctite for any bearing or main caps. Technically speaking if you know the physical properties of the nuts and bolts you're tightening and torque them to the correct torque, you will never need any locking devices, liquid or solid.
That said, with rod studs you want to 'set' the studs into the rod. Torque them, loosen them, and then torque them a final time. The first torquing will pull them all the way into the rod, and the final torque will keep them tight.
wes65, these are just general engine building tips, and in no way insult your engine building skills, if you did indeed build this engine. 18psi and 12,000rpm (which I highly doubt your friend did, btw) will kill just about all of our motors eventually.
That said, with rod studs you want to 'set' the studs into the rod. Torque them, loosen them, and then torque them a final time. The first torquing will pull them all the way into the rod, and the final torque will keep them tight.
wes65, these are just general engine building tips, and in no way insult your engine building skills, if you did indeed build this engine. 18psi and 12,000rpm (which I highly doubt your friend did, btw) will kill just about all of our motors eventually.
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Thread Starter
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From: Southern Indiana
It's common knowledge in the engine building world not to use lock washers or loctite for any bearing or main caps. Technically speaking if you know the physical properties of the nuts and bolts you're tightening and torque them to the correct torque, you will never need any locking devices, liquid or solid.
That said, with rod studs you want to 'set' the studs into the rod. Torque them, loosen them, and then torque them a final time. The first torquing will pull them all the way into the rod, and the final torque will keep them tight.
wes65, these are just general engine building tips, and in no way insult your engine building skills, if you did indeed build this engine. 18psi and 12,000rpm (which I highly doubt your friend did, btw) will kill just about all of our motors eventually.
That said, with rod studs you want to 'set' the studs into the rod. Torque them, loosen them, and then torque them a final time. The first torquing will pull them all the way into the rod, and the final torque will keep them tight.
wes65, these are just general engine building tips, and in no way insult your engine building skills, if you did indeed build this engine. 18psi and 12,000rpm (which I highly doubt your friend did, btw) will kill just about all of our motors eventually.
held up quite nicely, i think.
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Like SolarYellow said, I wonder if ARP's would have stopped this. Everything I've seen, people say they aren't needed, but this seems to show otherwise. First cap I've seen fail on a Miata. Sure its happened before though.
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Even if the bearings were completely flat, wouldn't the caps still be snuggly against each other where the bolts go through. Perhaps the bolt didn't streatch in total length, but the threads may have given way just enough to let the nut become loose. Only way I can see it happening.
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From: Southern Indiana
Even if the bearings were completely flat, wouldn't the caps still be snuggly against each other where the bolts go through. Perhaps the bolt didn't streatch in total length, but the threads may have given way just enough to let the nut become loose. Only way I can see it happening.
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My hunch is that the bolt stretched just enough for the nut to then be loose enough to back off. Looks like you dominated your starter too.
Are you interested in that 99 head? I'll be in New Albany from Sunday through most of next week and will be stripping the parts car. Give me a shout if you want to check it out.
Are you interested in that 99 head? I'll be in New Albany from Sunday through most of next week and will be stripping the parts car. Give me a shout if you want to check it out.
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Former Vendor
Joined: Dec 2007
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From: Texas Hill Country
I've suggested at least a thousand times that with my bandsaw and heliarc welder, I can repair anything. After looking at your con rod debris, I think I'll tone that down a bit.
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From: Fake Virginia
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