Identifying non-CB crankshafts?

[SlowShelby]

How do you tell the difference between forged and cast non-commonblock crankshafts? Does anyone have pictures of what the forged crank looks like?

[looneytuner]

The balance weights are machined on the forged. If the counter weights are just the original casting it's not forged.

[SlowShelby]

Have pictures of what your talking about?

[minigts]

Aren't the number of flywheel bolts different? If you find one with a 4 bolt pulley gear, that's an easy giveaway, assuming it's still on it.

[Directconnection]

What's this then? The CWs are machined, but looks to be cast....

[turbovanman²]

Its simple, cast cranks have parting or casting lines on the throws, look at ^^^^^ pic, you can clearly see them. Forged cranks are smooth, no casting lines.

Also, non CB cranks have a large front crank seal area, CB cranks and 2.5 tall deck cranks have a small seal surface, aprox 1.12" in diameter but also be VERY careful, Tall deck cranks are identical but the front snout is aprox .850" in diameter vs 1 inch for a CB crank, found that one out the hard way,

Edit, 2.5 cranks have a 2.5 written on them too.

[Directconnection]

Its simple, cast cranks have parting or casting lines on the throws, look at ^^^^^ pic, you can clearly see them. Forged cranks are smooth, no casting lines.

I know that....

But explain the pic above

[turbovanman²]

I know that....

But explain the pic above

Explain? Looks like a cast crank that's had the counterweights knife edged!

We know you know that, the thread starter doesn't!

[Directconnection]

Explain? Looks like a cast crank that's had the counterweights knife edged!

We know you know that, the thread starter doesn't!

It's had more than just the CWs knife edged... bullet nosed and lightened to boot.

[turbovanman²]

It's had more than just the CWs knife edged... bullet nosed and lightened to boot.

Aren't you special,

Is this for your never running cars,

[Directconnection]

Aren't you special,

Is this for your never running cars,

At least they don't blow up like your's... I buy them all "Simoned up" (ie: broken) that way.

Actually, the crank wasn't for me... but I did all the work on it for a circle track car. Won the '09 championship that year... Checkers or Wreckers!

[turbovanman²]

At least they don't blow up like your's... I buy them all "Simoned up" (ie: broken) that way.

Actually, the crank wasn't for me... but I did all the work on it for a circle track car. Won the '09 championship that year... Checkers or Wreckers!

But at least I drive them,

Cool, make one for your TIII,

[SlowShelby]

Cool pic and everything, but Im still looking for a picture of a FORGED non-commonblock crank

[turbovanman²]

Cool pic and everything, but Im still looking for a picture of a FORGED non-commonblock crank

You don't need one, use the info posted and you'll easily find one.

[Directconnection]

Casted cranks ave a very thin and sharp parting line.... like the width of a pin head. Forged cranks have a large parting line where the foundry GRINDS off the forging flash (whatever it is called). The parting line on a forged crank is at least 1/4" to sometimes as much as 1/2" Casted cranks are more bumpy from the casting process, whereas forged units are a bit smoother.

It's easy as hell to tell.... especially by the weight.

Simon: no time to do that to my crank... wish I did. I have little time after work to work on it, I had LOTZ of hours into that one. The T-III I want to put into my Shadow... that will get the full monte. I guess you can say that I am leaving a few cards on the table hp-wise... but I'm ok with that for now. I'm just going to use a stock CB T-II pan/pickup to get me through as I don't have a care to do autocross stuff, anyways.

[turbovanman²]

Simon: no time to do that to my crank... wish I did. I have little time after work to work on it, I had LOTZ of hours into that one. The T-III I want to put into my Shadow... that will get the full monte. I guess you can say that I am leaving a few cards on the table hp-wise... but I'm ok with that for now. I'm just going to use a stock CB T-II pan/pickup to get me through as I don't have a care to do autocross stuff, anyways.

Quit chasing the woman and get it done,

[Directconnection]

Quit chasing the woman and get it done,

Man.... you hit the nail right on the head!