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Join Date: Mar 2002
Location: Essex UK
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964 crank-is this a std/std?

just measured a 964 crank that I have, the mains are 59.98 and the big ends are 55.00 is this a std/std?

Thanks,

Andy
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Andy

1980 SC soon to be big hp 3.3t powered 73RSR Replica (well, I'm keeping the engine but everything else is going )
Old 04-23-2005, 11:45 AM
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Your crank seems stock and within the wear limit according to my Bentley Technical Manual. Page 13-4 says:

Main bearing journals 1-7
standard: 59.971-59.990mm
wear limit 59.960mm

Main bearing journal 8
standard: 30.980-30.993mm
wear limit 30.970

Connecting rod journals
standard: 54.971-54.990mm
wear limit 54.960mm

Smaller sizes in increments of .25 and .50mm indicate a modified grind.
Old 04-24-2005, 07:49 AM
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cheers don but it would look like my con rod journals are out of spec if they are 55.0 right?

Andy
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1980 SC soon to be big hp 3.3t powered 73RSR Replica (well, I'm keeping the engine but everything else is going )
Old 04-24-2005, 08:19 AM
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Hmmm, 55.0 is mighty close to spec. Wear would make them smaller than spec, thus requiring machining to an even smaller increment. Try measuring again after they are polished.
Old 04-24-2005, 09:12 AM
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55.0 is less than 0.5 over the spec so I would say it's acceptable. I agree with Don.
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Old 04-27-2005, 02:35 PM
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cheers cheers Don and Iroc. looks like its a standard crank then

thanks

Andy
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1980 SC soon to be big hp 3.3t powered 73RSR Replica (well, I'm keeping the engine but everything else is going )
Old 04-28-2005, 02:33 PM
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