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Tractor Pulling Discussion Forum

stroking an A

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J D Bill

01-20-2005 15:21:42




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I am wanting to stroke my unstyled A I am thinking somewhere in the seven inch range what will I have to do the block or anything else inside and who can make me a crank or where can I get one. Thanks




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A Driver

01-21-2005 21:23:38




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 Re: stroking an A in reply to J D Bill, 01-20-2005 15:21:42  
I disagree with the part about you never have to touch the block. It depend on the year. Unstyled you would have to notch the block at 8.75 or 9" for the rod to clear. Real easy to do compared to cutting out windows in the back of the housing.
Schooler charges the same price for up to 9" due to the set up time being the same, just less welding. So economially it makes sense to go with the most stroke for the same money. It depends who you have do it.

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Drew

01-21-2005 06:16:02




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 Re: stroking an A in reply to J D Bill, 01-20-2005 15:21:42  
I'm going to have to agree with A Puller, if you are going to mess with it, go ahead and go big. At 7.000" you wont have to do any internal work to make it swing. When you start getting above the high 7.xxx" is when backs of crankcases start to become windowed and cams start getting flat spotted and cylinders get notched for rods to clear.

Campbell Crankshaft & Auto Service 1103 Southwest Blvd Kansas City, KS (913) 236-6789

We got our last crank from Campbell's and got it back in a couple weeks. It was more expensive than other places, but it was also execellent quality.

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A Puller

01-20-2005 20:01:28




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 Re: stroking an A in reply to J D Bill, 01-20-2005 15:21:42  
Well, at any stroke, you don't have to touch the block. Depending on what pistons you have, and the compression ratio you want to run, you may have to cut the rods to get the right length.
In my opinion, however, either just put a styled A (6.75") crank in it, or else go big! For what it costs to do a crank, it really doesn't make any difference how big you go, it costs about the same. As to who can do cranks, every puller will tell you a different name, each with their own stand-bys. Get yourself a copy of "The Hook" magazine, and look through the suppliers in it, and you can go from there.

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