Crankshaft: How to tell if its forged?

Ive got a locked engine on my hands, so im in the market for a block to rebuild. I want to find one with the forged crank. But I dont know how to tell the difference between cast and forged. Is there a way to tell?
And if anyone knows where I can get some forged pistons for cheap im lookin for a set of those too.
Thanks a bunch

[Frank]

Quote:

Originally Posted by kooterskkar Ive got a locked engine on my hands, so im in the market for a block to rebuild. I want to find one with the forged crank. But I dont know how to tell the difference between cast and forged. Is there a way to tell? And if anyone knows where I can get some forged pistons for cheap im lookin for a set of those too. Thanks a bunch

Dont mess with forged cranks. They are way to heavy, and the cast can handle lots of power. Just 8lbs of rotating mass in first gear is closely equivelent to loosing 200lbs of the car itself!!!!

Just ask Ken.

Frank

[OmniSRT4]

Quote:

Originally Posted by fkatzenb Dont mess with forged cranks. They are way to heavy, and the cast can handle lots of power. Just 8lbs of rotating mass in first gear is closely equivelent to loosing 200lbs of the car itself!!!! Just ask Ken. Frank

For a SOHC 8V car I agree completely.

I would recommend a lightened forged crank for a 16V hybrid though due to the increase in power.

Another option is SM performance billet 4 bolt mains with a cast crank.

[glhsken]

Hold on.. If it's a non-common block, For big power... go with the forged crank. It will add some rigidity to the assy. For a common block, use a cast 2.2L tbi crank to save that mass.

[OmniSRT4]

Quote:

Originally Posted by glhsken Hold on.. If it's a non-common block, For big power... go with the forged crank. It will add some rigidity to the assy. For a common block, use a cast 2.2L tbi crank to save that mass.

My comments were based on the assumption that it was a commonblock.

If it is not, listen to Ken, and get those main caps also, they arent expensive.

[Frank]

Quote:

Originally Posted by glhsken Hold on.. If it's a non-common block, For big power... go with the forged crank. It will add some rigidity to the assy. For a common block, use a cast 2.2L tbi crank to save that mass.

good point.

[Aries_Turbo]

hey sean,

where do you get these maincaps and do you have to drill/tap 4 more holes? would they strengthen a non commonblock to a commonblock strength? just curious.

sorry to hijack

Brian

[OmniSRT4]

Quote:

Originally Posted by Aries_Turbo hey sean, where do you get these maincaps and do you have to drill/tap 4 more holes? would they strengthen a non commonblock to a commonblock strength? just curious. sorry to hijack Brian

They use the balance shaft holes if you have that kind of block, otherwise, you would need to make them.

They definitely increase the blocks strength but I cant say how much without scientific testing.

SM performance is on the web but I am at work and do not have the address.

These are the same people that have the 9 second fwd charger.

I believe the caps were 300$ a set.

[Aries_Turbo]

thats cool. i wonder what the max hp would be on a 2.5l tall deck with those installed.

Brian

[OmniSRT4]

Quote:

Originally Posted by Aries_Turbo thats cool. i wonder what the max hp would be on a 2.5l tall deck with those installed. Brian

The tall deck is already stronger than the non-commonblock (but not quite up to CB standards) so I imagine with the 4-bolt billet mains it would be equal to if not better than a CB.

Consider this...a commonblock with billet 4 bolt mains still doesnt hold a candle to the SRT4's stock bottom end design.

Whats the difference between common and non-common block?
Maybe it would help if I knew what engine I already have. So how do I tell what ive already got? The only thing I really know for sure is its a 2.2.

[glhsken]

Non common block has a fuel pump block off plate bolted on just below the distr area. the cb has this area cast.

[OmniSRT4]

Quote:

Originally Posted by kooterskkar Whats the difference between common and non-common block? Maybe it would help if I knew what engine I already have. So how do I tell what ive already got? The only thing I really know for sure is its a 2.2.

More than likely you have whatever engine your car came with originally.

If its an 88 or earlier, its a non-cb.

If its an 89, it could be both, in theory, but is supposed to be a CB.

If its a 90+ its a CB.

If the motor has been replaced, it could be either, then look for the already mentioned block-off plate.

[OmniSRT4]

Quote:

Originally Posted by Akuma They use the balance shaft holes if you have that kind of block, otherwise, you would need to make them. They definitely increase the blocks strength but I cant say how much without scientific testing. SM performance is on the web but I am at work and do not have the address. These are the same people that have the 9 second fwd charger. I believe the caps were 300$ a set.

http://www.streetmachineperformance.com/

TD Usernname: SMPerformance

Quote:

Originally Posted by Akuma More than likely you have whatever engine your car came with originally. If its an 88 or earlier, its a non-cb. If its an 89, it could be both, in theory, but is supposed to be a CB. If its a 90+ its a CB. If the motor has been replaced, it could be either, then look for the already mentioned block-off plate.

OK ill have to check it out tomorrow.
Thanks a bunch