how do you identify a crank

[freaky510]

I have a L18 with what i think is a L20 crank in it.Not sure tho so how would a guy tell what crank he got

i dont know if you can tell they have been shaved down

 

[/img]has a A87 stamp

 

21683 are the #

[cg78]

Call a machine shop they should be able to help you.

[datzenmike]

The L20B has larger main bearings and will not fit the L16 or L18 block unless they are turned down.

 

The L16/18 crank has five flywheel bolts in the end. An L20B and Z20/22/24 has six. The L20B usually has 'U60' cast on the rear throw.

[datzenmike]

If you were to turn the L20B mains down to fit the L18 block you could over bore 1 mm to 85mm and fit Z20E (31.75) flat top pistons on L16 (133mm) rods. This would give you a 1950cc motor with an open chamber L20B head compression of 10.2 Basically an L20B in an L18 block. The drawback is the very short deck/rod length which would add side load to the pistons and not be good for high revs. This is why the L20B is 2cm taller than the L16/18.

[yello620]

Does anybody have pictures of a Z24 crank compared to a L20b crank, and maybe even a Z22 crank. I keep thinking of the Z24 crank in a Z22 block idea.

Has anybody actually seen a Z24 crank that has been machined down?

 

Jason

[freaky510]

yea mike. i think thats what he did. i dont rember all the info on the motor .i came in a dime i bought 6years back.it had a holley carb onit. I blew the ring walls out in the#1 piston and never got around to fixing it i do belive that it was a 120 crank with L16 rods and a z piston that was milled to a flat top it revd nice.didnt last long. Iam just thinking of building a L motor and looking at all the stuff i have and going with the craziest i can come up with :lol::lol: