Identifying a stroker crank

pigpen

pigpen

Location
kalispell
Idk if anyone can answer this for me but I recently tore down a 6m6 out of a square I had and the previous owner told me it was completely built. I know the cylinders were ported but when I got the crank out you can see where the ground the cases to clear what appears to be a larger stroke crank. I'm unfamiliar with crank specs and that kind of stuff. Here are some pics I snapped. Any help would be appreciated because I would like to get rid of this stuff and not really sure what I'm dealing with yet.

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And also I don't what happened but the snout on the crank is boogered up, flywheel was still well attached to I think it could still be ran, just looks like a$$.

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pigpen

pigpen

Location
kalispell
I have no idea what they were doing but it doesn't look real pretty, flywheel still held good.

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RMBC Freeride

RMBC Freeride

Vintage
Site Supporter
Location
Pueblo, CO
Look for a number punched into the side of the crank webs. (usually 72, 73 or 74) It looks like it could be stroker because the bottom rod bearing seems to be offset from the lobe on the crank web. Rod type/length has nothing to do with it. Many +4mm, 5mm and 6mm stroker cranks were "repinned" stock cranks. That's what this looks like.

But it is SHOT, due the that hammered taper on the snout...
 
S

Schmidty721

someone turf my rails
Location
WI
I think what you're seeing is someones attempt to port the cases. I don't see any signs of clearancing for a stroker crank.
Between the rust on the rod and the snout... I think you have a core
 
MTRHEAD

MTRHEAD

Location
MotorCity
Definitely a stroker. You can see the offset of the thrust washer. Probably +4mm. It's got pressed hollow pins and 82m sled rods. Same length as superjet. Good stuff!!
 
pigpen

pigpen

Location
kalispell
Good info guys, I can't find any other markings on the crank. Was just curious as to what this thing was. So with the bad snout this thing is garbage?

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orangefinger

orangefinger

Location
Reno,NV
the hammering might be a loose/broken woodruff key or loose flywheel which allowed the key out of the groove on one side , I had a similar one looking like that
 
Nuklear6

Nuklear6

I Dream 10' Surf!
Location
Bordentown, NJ by week / Brigantine, NJ by weekend
Definitely a stroked stock web crank. In other words a machine shop re machined the lower rod pin holes further from center and then build the crank as normal. As said above id guess +4mm (judging by visual offset of the pin/washers and the cases not being trenched). Now, that crankshaft is JUNK. DO NOT put it into any engine case you care about. Whatever caused the damage to the snout has likely thrown the crankshaft assembly out of true and phase. With that damage it isnt worth even rebuilding. Sorry
 
pigpen

pigpen

Location
kalispell
Nuklear6 said:
Definitely a stroked stock web crank. In other words a machine shop re machined the lower rod pin holes further from center and then build the crank as normal. As said above id guess +4mm (judging by visual offset of the pin/washers and the cases not being trenched). Now, that crankshaft is JUNK. DO NOT put it into any engine case you care about. Whatever caused the damage to the snout has likely thrown the crankshaft assembly out of true and phase. With that damage it isnt worth even rebuilding. Sorry
Click to expand...
Guess it will make a nice lamp stand.

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Th3g3rm4n4t0r

Th3g3rm4n4t0r

Brawlin' n Flippin'
Location
Ajax, Ontario, Canada
Disassemble crank. weld & machine snout or purchase new web... Depending on price of web.. Ressamble & true crank Maybe $450? CAD thinknig outloud...


Might not be worth it, it is a 650 motor IMO.. Buy a new 5mm stroker and throw it in from ADR.
 
pigpen

pigpen

Location
kalispell
Wasn't really interested in rebuilding it, would sell or send in for a core if someone was interested.

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yamanube

yamanube

This Is The Way
Staff member
Location
Mandalor
Th3g3rm4n4t0r said:
Disassemble crank. weld & machine snout or purchase new web... Depending on price of web.. Ressamble & true crank Maybe $450? CAD thinknig outloud...


Might not be worth it, it is a 650 motor IMO.. Buy a new 5mm stroker and throw it in from ADR.
Click to expand...
While this particular crank has seen better days, putting a stroker crank in a set of 650 cases does not devalue the crank itself.
 
pigpen

pigpen

Location
kalispell
I'm not personally looking to use the crank, it just came out of a SN that I parted out. I just finally tore the motor down last week to look at it. I was just curious if there possiably any value in the crank to someone else before I scrap the thing.

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