where can i find afordable crankshaft straightener for 2 & 4 cycle engines?

Answer 1

If you're just going to be using it in your garage go to Harbor Freight or Northern Equipment etc, etc.or one of those other "discount" hardware stores, and get a 20 ton shop press.
If you need it for a business then you may want to buy a better quality one. For home use the cheaper ones are fine.

Then make yourself a set of V-blocks to set the cranks in and an attachment for the press arbor which will fit over the journal, and your all set.

You can make a jig for your indicator which looks about like a tetter-totter for your dial indicator, one end will ride under the journal or nose while the opposite end presses upward on your indicator.

That's all my father and I have used for automotive cranks for years and it works just peachy, and he's been doing it for over 45yrs.
We do cook them for a while before straightening though.

If you want to e-mail me at my yahoo address I can take some digital pics of our set-up to send you.
Just put Cranksaft straightner in the subject so I know it isn't junk mail and accidently delete it.

Answer 2

I have seen decent home-made jigs for this. You have to have a couple of support blocks. I suggest they be brass lined to avoid gaulling the crank journals. To straighten, you use a cable hoist to pull down on the center of the crank. Again you want to protect the journal with brass.

Or you can check around some older automotive machine shops. They don't do a lot of that kind of work anymore and might have an old one you can buy cheap.