| jamesmundstock | -- 08-01-2017 @ 2:55 PM |
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I am working on my 47 59A and I am going to have it bored 3.313 and stroke to 4.125. Scat has different part numbers between the 59A and the 8BA. Eagle only has part numbers for the 8BA. Are these rotating assemblies interchangeable if not what is the difference? Thanks in advance for the response.
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| pauls39coupe | -- 08-01-2017 @ 6:46 PM |
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Your 59A has full floating rod bearings, the 8BA has fixed bearings. The rods are different as are the oil holes in the crank.
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| TomO | -- 08-02-2017 @ 8:00 AM |
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You can use the 8BA crank shaft in a 59A block with the 59A rods, but I would go for the 8BA rods due to the familiarity of machine shops with the fixed bearing. The floating bearings have 2 measurements that have to be right on in order for the engine to survive. The inner diameter matches the crank diameter and the outer diameter must match the rod opening. Some machine shops try to make the outer diameter fit the rods by filing or grinding the mating faces of the rod cap and rod. This leads to an egg shaped opening that will destroy the bearing. In any case, the floating bearings can add to the complexity of the build, depending upon the wear in the rods. You may also have to change the rear main seal holder to the "bus" type that will accept the rope seal, if your current crank shaft has the slinger type rear seal. Tom
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