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Re: Difference between Crankshafts for Ford 6610 a
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Posted by Rod F. on May 24, 2005 at 19:58:37 from (142.177.87.177):
In Reply to: Re: Difference between Crankshafts for Ford 6610 a posted by AlexL on May 24, 2005 at 09:30:36:
Ahhhh, one of those little problems..... There isn't much way to tell them apart that I am aware, unless you can get a very accurate measure of the crank throw. VERY VERY accurate. The 4.2" crank will have .1" less throw than the 4.4" crank. I don't know if I'd even attempt that stunt myself, and I've got as much evil engineer in me as anyone. A tenth of an inch is not much, especially when you can't get an accurate position to measure from. One suggestion I could make would be to project a straight edge down the centerline of the main journals, and try to take a measure from that to the outside of the rod journals with a large caliper, then subtract the radius of the rod journal. That should give you the crank throw, which doubled will equal the stroke. I'm into some very "free thinking" right now. Take it for what it's worth. Perhaps a better alternatitive, if you don't mind the work, is to drop each crank in a block, and assemble a rod and piston to it, then measure the stroke it produces. That will give an accurate measure with depth gauges, but it's a bit of work. I'm sure there are casting numbers as well, but I have no idea how to decipher what they mean. I hope you don't have two used cranks sitting side by side on the floor..... Good luck. Rod
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