1923 roadster vibration

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Model T Ford Forum: Forum 2014: 1923 roadster vibration
Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Saturday, June 07, 2014 - 12:09 pm:

1923 roadster, rebuilt engine and Ruckstell rear end. It has a vibration and at about 30-35 it reaches a peak then drops off but is still there, the kind that numbs your feet and butt after driving for a while. The rods are within 4 grams of each other, the flywheel/magnets balanced, pistons weight the same. No balancing on crank or drums. New bushing in the transmission and wood bands. Car runs strong and has a good amount of driving done with it after rebuild. Bosch distributor with counter weights tied down. He thinks it's the rear end but it's not a pulse type vibration, it's steady and increases as the RPM go up. I think it's the harmonics of the engine. Any thoughts?


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Mazza on Saturday, June 07, 2014 - 07:39 pm:

Do you notice a vibration at a certain rpm in low gear as well as high? That could help eliminate the chances that it is in the engine. If the vibration only happens at 30-35 it may be wheels/tires


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Saturday, June 07, 2014 - 07:48 pm:

The vibration is there all the time but reaches it's peak at about the speed indicated then drops off.

To update; I just talked to him and he has redone the timing. Seems to run much better but will still need to do a good road test to find out.
MarkG


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Mazza on Saturday, June 07, 2014 - 08:03 pm:

Vibrations are always annoying and time consuming to figure out, let us know what you find. Always good to know what cure other people issue so when I have one I can look back and keep trying


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