Broke Okrasa 82mm Stroker Crank

risk · Posted: Thu Sep 05, 2013 7:26 am Post subject: Broke Okrasa 82mm Stroker Crank

My new canoe anchor...

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fivelugshortaxle · Posted: Thu Sep 05, 2013 8:06 am Post subject:

Nice!

You've actually got two canoe anchors now! Cool

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jfats808 · Posted: Thu Sep 05, 2013 10:07 am Post subject:

Before u toss it , see if Dpr or demello can repair it. Other than tge the obvious, any takes on what caused it? Something fall in the chamber or hydro lock, etc? Oil starvation.

After more looking at it isee multiple cracks on the journals. May not be worth the cost repair if it even can be.
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risk · Posted: Thu Sep 05, 2013 10:54 am Post subject:

A little history on this crank..

I bought it from a guy that raced vintage midget circle track cars. It was turned .010 & .010 and the case it was in had some battle scars from losing a rod or piston etc.

I put it all together with new bearings etc, and it ran great for about a year or so... then I put the turbo on and it ran even better.

Earlier this year I overboosted/detonated and cracked two cylinders... I replaced the cylinders and rings and ever since it had oil pressure issues, and would lose prime.

I think it had a hard life on the dirt track... but I probably put the last nail in the coffin when I popped those cylinders.

risk · Posted: Thu Sep 05, 2013 10:55 am Post subject:

fivelugshortaxle · Posted: Thu Sep 05, 2013 11:02 am Post subject:

Quokka42 · Posted: Thu Sep 05, 2013 1:41 pm Post subject:

HRVW · Posted: Thu Sep 05, 2013 1:45 pm Post subject:

Those mains look like a oil starving problem.

Get a case of JB Weld and make it into a lamp and smile every time the lamp light up.

Quokka42 · Posted: Thu Sep 05, 2013 1:56 pm Post subject:

Oh, I think the OP got it a heavily overboosted engine can have one cylinder firing on the upstroke while the next is firing on the down...
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jfats808 · Posted: Thu Sep 05, 2013 2:05 pm Post subject:

Quokka42 · Posted: Thu Sep 05, 2013 2:24 pm Post subject:

Oh, lighten up. I was being facetious.

I do actually feel sorry for the guy, in fact I almost shed a tear myself at the death of an Okrasa.
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Boolean · Posted: Thu Sep 05, 2013 2:29 pm Post subject:

Fatigue. The beachmarks center around the oil hole.
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RLFD213 · Samba Member Joined: January 21, 2009 Posts: 331

That's not broken. It's a 2 piece racing crank.

ralf · Posted: Thu Sep 05, 2013 3:39 pm Post subject:

3r/last pic of the OP's post

notice the non broken side of the journal's shoulder

crack evident.... gues if it didnt crack where it did now
it would have cracked on the other side of the same journal
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esde · Posted: Thu Sep 05, 2013 6:13 pm Post subject:

Was the center main beat into the case very badly?
Did you have the crank magnafluxed before running it? Did you align bore the case before running it?

Bubba & Waynes Drag C · Posted: Thu Sep 05, 2013 7:01 pm Post subject:

that will buff right out

fastone · Posted: Thu Sep 05, 2013 9:20 pm Post subject:

That's not uncommon to see with Midget cranks constant RPM's in those cars is 5000 to 8500.
I worked for Auto-Craft in the 80's and have seen many come in with cracks in the center main.

There is a reason people say you need a type 4 center main Wink

drumbum68 · Samba Member Joined: October 15, 2010 Posts: 566

Okrasa's had aluminum plugs?

tattooed_pariah · Posted: Fri Sep 06, 2013 8:37 am Post subject:

meh, some JB Weld will fix that right up.. Cool

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