Flywheel Input 150-40/150-403 S&S rod - The Jockey Journal Board

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Old 09-24-2012, 07:46 AM   #1
AndrewC
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Default Flywheel Input 150-40/150-403 S&S rod

Looking for some input here I have a really nice flywheel setup with part numbers as follows 150-40 and 150-403 (Stock 50 Pan I believe) the rods and shaft are S&S part number for rods are 7001 and 7002, really hoping to use these on a pan build, thanks for any input- Drew
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Old 09-24-2012, 08:09 AM   #2
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Default Re: Flywheel Input 150-40/150-403 S&S rod

Drew,
Those are casting numbers for flywheels that will fit any '40-'54 Knuckle or Pan. However the 61 and 74 flywheels are the same physical dimensions other than stroke, so you need to verify that as well. 61s use a stepped crankpin so the nut is smaller than 74. They also measure approx 1/4" less on the mainshaft to crankpin centers so about 1-3/4 as opposed to approx 2" for 74. Rods are the same for both.What are your measurements?
Robbie
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Old 09-24-2012, 08:56 AM   #3
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Default Re: Flywheel Input 150-40/150-403 S&S rod

Thanks Rob, I'll double check my measurements when I get home today but am pretty sure they are for the 74in, my main concern were the rods as I can't find much info at all regarding them.
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Old 09-24-2012, 10:27 AM   #4
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Default Re: Flywheel Input 150-40/150-403 S&S rod

Those are casting numbers on the rods. 41-81 knuck, pan and shovel share the same part number. Should have a .791 wristpin and a 7.440" rod length. PN you need is 34-7004. email me direct if you need to. [email protected]
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Old 09-24-2012, 11:43 AM   #5
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Default Re: Flywheel Input 150-40/150-403 S&S rod

Andrew,
Same rods (S&S 7001 and 7002) as I have in my '54. Very nice parts.

Oh yeah, I'm pretty sure there is a good picture in Palmers book that shows the difference between the 61" and 74" in the holes for the crankpin and crankpin lock that Robbie mentions.
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Last edited by old.wrench; 09-24-2012 at 11:51 AM. Reason: added info
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Old 09-24-2012, 12:21 PM   #6
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Default Re: Flywheel Input 150-40/150-403 S&S rod

Quote:
Originally Posted by Dragstews View Post
Those are some nice rods.....
S&S heavy Duty....It is strongly suggested to do a "Balance Job" to the crank when using these rods.... They have much more weight to them over the OEM rods...
Drew!

As Dragstews point out, heavy rods will drop the factor, but I strongly suggest determining the resulting factor first, and then decide an approach to balancing concerns, before surrendering to a big shop tab, and flywheels that look like swiss cheese.

The choice of factor is the crux of motor balancing,
yet 52% motors feel just as smooth as 60% motors.
How can that be?
Uncounted rebuilds have used heavy rods without re-balancing, successfully.
How can that be?

It is because motor balancing has nothing to do with the rider!

The majority of balance jobs are not worth lightening your wallet.
Fine-tuning a factor, (if that is even possible today), can be performed without bells, whistles, strobes, and dashpots.

They even did it before computers.

...Cotten
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Old 09-24-2012, 12:25 PM   #7
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Default Re: Flywheel Input 150-40/150-403 S&S rod

Quote:
Originally Posted by Dragstews View Post
Those are some nice rods.....
S&S heavy Duty....



It is strongly suggested to do a "Balance Job" to the crank when using these rods.... They have much more weight to them over the OEM rods...
This is the flywheel setup I called you about that I'm going to drive up to you, got the package and low and behold a beautiful set of S&S rods couldnt believe it the seller never even mentioned them ???
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