Crankshafts

[Delk]

Does anyone know if anybody is making or has a source for new 4.2 crankshafts?

I am colecting parts for my second storker and since this one will be supercharged it would be nice to have a nice new crank.

Delk

[1bolt]

HESCO I think has new old stock cranks but (and I say this not knowing the price for sure) it's probably expensive.

[Muad'Dib]

Moved to the basic forum seems it belongs there better.

[Shark]

i think there was a company our of Atlanta that was making new OEM cranks. i will try and look it up for you.

[Shark]

http://www.atlantacrankshaft.com/

[Delk]

They are who I bought my last crankshaft from. Great service but they just had ground crankshafts at that time.

[Shark]

why do you need a new one anyway? sounds expensive.

[Delk]

It's not a question of need. I was just looking around to see if there is an option for a new crank. I figured after I spend the money on forged pistons, eagle rods and a supercharger it would be nice to put a new crank and standard bearings in.

Delk

[fishyjeep]

You can use standard bearings if you get one of hesco's hard chromed cranks. I believe the chroming process brings the journals back up to standard.

[1bolt]

Why is it HESCO is always doing something wacky that I've never heard of before? Chromed Cranks? I guess that's an offshoot of the fact that we don't have any steel or forged aftermarket cranks to choose from so naturally HESCO can offer something slightly tougher than stock and it's the only game in town. They also offer a cryo treated shot peened OEM cast crank.

So without searching HESCO's forums whats the scoop on chromed cranks?

[John]

Hard chroming has been used for a long time to reduce coefficient of friction, build up dimensions and reduce wear, Most common example is think of a hydraulic cylinder shaft and bore.Used it in an application of 2500 tons and it lasted for many years. Application techniques vary from surfacing to actual permeation of the parent materials.
John

[tirod]

Chrome cranks have been out since, gee, the '50's? It an old hot rodder method to increase hardness on the journals - and build them up to a larger diameter. Chrome is a good choice when you don't want to pay the cost of nitriding a long six cylinder crank back to factory hardness when it's been ground, and the possible warping and rejects.

You do get them nitrided after they've been ground more than .002", right? It's more important than balancing in my book.

Chrome has been on again, off again, for decades as the real point is getting good hardness on the journal face to resist wear - and once electric welding of journals came out with high hardness rod, it's taken a back seat, especially with all the hazmat surrounding chrome.

Chromed or nitrided, stock journals need something to bring them back up to spec after they've been turned.

[Cheromaniac]

You can use standard bearings if you get one of hesco's hard chromed cranks. I believe the chroming process brings the journals back up to standard.

The chroming process, like nitriding, surface hardens the journals so that they can withstand more abuse than a stock crank without increased wear. Chromed or nitrided cranks are most suitable for forced induction applications where higher cylinder pressures are transmitted to the rod journals.
Unfortunately nobody manufactures new 258 cranks so the remaining ones that are being sold are used cores that are reconditioned. The same goes for the 258 rods.

[1bolt]

All very interesting... I wonder does anyone Cryo treat cranks or rods? I've heard that this can increase overall hardness (not just surface hardness like peening) I know it's popular with axle shafts.