Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

Which crank is what?

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Old 06-07-2009, 05:25 PM
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Bozarth
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Default Which crank is what?

Can anyone tell me with certainty which crank is what? Both are Nelson cranks for either Q500 or Q40 motors that I have had over the years. Thanks.

Kurt
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Old 06-07-2009, 05:38 PM
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BarryReade
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Default RE: Which crank is what?

I will be surprised if the "B" crank is not the QM40 crank because of the additional maching of the intake port.
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Old 06-07-2009, 05:57 PM
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daven
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Default RE: Which crank is what?

Cranks are the same between Q500 and Q40 motors.

The latest cranks have a larger intake than the older cranks.

Personally, I'm not sure that makes them any faster, but working on testing them now...
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Old 06-07-2009, 07:03 PM
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Bozarth
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Default RE: Which crank is what?

I'm wondering now if A has been "machined" by a previous owner?

Kurt
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Old 06-07-2009, 07:41 PM
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Bozarth
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Default RE: Which crank is what?

I sent these photos to Dave Shadel earlier in the day.  To paraphrase Dave's response:  "A is junk (a short lived bad idea) and B is fine.  Q500 and Q40 cranks are the same."

Kurt
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Old 06-08-2009, 11:16 AM
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djlyon
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Default RE: Which crank is what?

The "A" cranks look like the ones in my old ABCs

Denis
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