Flywheel runout

[Rasmusvestlin]

Hello,

I have a 440 with a A833 4-speed with a mccleod clutch and a RAM billet 130 tooth flywheel, i bought the flywheel from a friend and it hadnt run much. After i installed everything and run the engine on the starter i noticed the flywheel was abit wobbly, i messuered the flywheel with a indicator gauge and it has a run out of 0.030 inches. The car drives great and its zero vibrations in the car, i wonder if its dangereus to drive the car?

Thanks!

[Filthy Filbert]

My answer is going to be another question...

How do you know the flywheel has the runout, and not that the crank flange is bent?

I'd be inclined to say that if there are no vibrations, and the shifts are not impacted, then send it.

[Rasmusvestlin]

My answer is going to be another question...

How do you know the flywheel has the runout, and not that the crank flange is bent?

I'd be inclined to say that if there are no vibrations, and the shifts are not impacted, then send it.

The engine is fresh rebuilt, not many miles on it. The crank is machined and balanced. So i am quite sure the run out is in the flywheel. But no vibrations and the shifts is good. I am just wondering if the flywheel can "explod" or crack if i get up in RPM? Its a billet and not a cast iron flywheel.

[Rasmusvestlin]

My answer is going to be another question...

How do you know the flywheel has the runout, and not that the crank flange is bent?

I'd be inclined to say that if there are no vibrations, and the shifts are not impacted, then send it.

Also Bc if i put the enigine at tdc and set the dial indicator at zero and then turn the engine 90° it will read 0,030 and at 180° it will read zero and at 270 it will read 0,030 again.

[B5fourspeed]

When a motor is balanced they need the flywheel,pressure plate and the balancer.Did you convert to a 4 speed after the motor was built?

[Ramman]

Not much help but from your indicator readings the flywheel is not bent. It's tacoed.

[Rasmusvestlin]

Not much help but from your indicator readings the flywheel is not bent. It's tacoed.

What you mean with "tacoed"?

[Ramman]

Just found it odd that if you measured the flywheel every 90°, it would be .000, +.030, .000, +.030.
Like a round taco shell being prepared for filing.

[Filthy Filbert]

Just found it odd that if you measured the flywheel every 90°, it would be .000, +.030, .000, +.030.
Like a round taco shell being prepared for filing.

Yup.

"Bent" would be .000 .000 .030 .000   

"Runout" would be .000 .015 .030 .015

what you have seems like the flywheel had too much material removed from the middle and not enough removed from the outside.  Picture the flywheel in the surface grinder with a 6" wide tool that has to make multiple passes.  If cuts are oriented from 12:00 to 6:00 starting from 9:00 and going to 3:00, the tool did not remove very much material at 9:00 and 3:00, and removed more material on the centerline pass from 12:00 to 6:00   resulting in a variance of .030 material removed.   That's how you get readings of .000 .030 .000 .030 as you rotate around the flywheel

[Rasmusvestlin]

Just found it odd that if you measured the flywheel every 90°, it would be .000, +.030, .000, +.030.
Like a round taco shell being prepared for filing.

Yup.

"Bent" would be .000 .000 .030 .000   

"Runout" would be .000 .015 .030 .015

what you have seems like the flywheel had too much material removed from the middle and not enough removed from the outside.  Picture the flywheel in the surface grinder with a 6" wide tool that has to make multiple passes.  If cuts are oriented from 12:00 to 6:00 starting from 9:00 and going to 3:00, the tool did not remove very much material at 9:00 and 3:00, and removed more material on the centerline pass from 12:00 to 6:00   resulting in a variance of .030 material removed.   That's how you get readings of .000 .030 .000 .030 as you rotate around the flywheel

Hmm okey , but i will take down the gearbox and change the flywheel to a new one. The car is far to nice to ignore it, dont want to damage something..