Is this crank / motor salvagable? - Miata Turbo Forum - Boost cars, acquire cats.

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View Poll Results: Is this motor rebuildable? / Would you rebuild it?
Yes, rebuild it. 400 hp. 1 25.00%
No, find another block because this one is hosed. 3 75.00%
Voters: 4. You may not vote on this poll

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Old 08-15-2007, 12:10 PM   #1
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Default Is this crank / motor salvagable?

big photo to load test philips bitch:

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Old 08-15-2007, 12:28 PM   #2
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It's hosed. (crank at least)

If the mains look fine... just get another crank. But that looks like some oil starvation or something similar, since it is on all the rod ends... so rest is probably hurt.
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Old 08-15-2007, 12:35 PM   #3
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that's what I was thinking. this looks like you might not get anything other than a shortblock out of it. a shortblock that needs machining.
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Old 08-15-2007, 12:39 PM   #4
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is that your bottom end? If you look up the bores in the pics, the rods look pretty smashed to me.
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Old 08-15-2007, 12:41 PM   #5
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that's pretty nasty. I don't know how much they can machine the crank down and still stay in spec... but if that's salvageable it's going to be a ---- hair away from out of spec.
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Old 08-15-2007, 12:49 PM   #6
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is that my bottom end, heh no.

it's the motor bruce has.
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Old 08-15-2007, 12:57 PM   #7
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if you were mcguyver you would take a car battery and some wire and weld the rods back together, then throw some chewing gum on the crank, and it would be good to go.

<---owns every season on dvd
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Old 08-16-2007, 10:29 AM   #8
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On the advice of the above members, I disassembled the rest of the short block. The only damage that is not directly replaceable(piston, connecting rod, oiler) is at the one bearing that spun and locked, doing the damage to the crank and connecting rod.

The rest of the journals and bearings are pristine, so if no one buys it, I will rebuild the bottom end.

Does anyone have a link to connecting rod bearing sizes so I can see if there is enough meat left on the one position to turn the crank? Haven't rebuilt a motor since I was a kid and did my mothers straight 8 Buick.
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Old 08-16-2007, 06:12 PM   #9
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Quote:
Originally Posted by Flyinmiata's page
"stock, +0.25mm/0.10" and +0.50mm/0.20"
on main, rod, and thrust bearings. just noticed their inch denominators are off by a decimal place.
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Old 08-16-2007, 06:31 PM   #10
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Quote:
Originally Posted by y8s View Post
is that my bottom end, heh no.

it's the motor bruce has.
I have a bottom end for you.
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Old 08-16-2007, 08:41 PM   #11
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what about a cyl head and what about cheap?
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