At speed car surges.

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Model T Ford Forum: Forum 2018: At speed car surges.
Top of pagePrevious messageNext messageBottom of page Link to this message  By Brian Giblin on Wednesday, July 04, 2018 - 10:41 pm:

Running along at 30+ mph car feels like it is surging from the back along with hearing a surging sound from the transmission. Fairly new at this hobby so I am not sure if itís suposed to be that way or if something is wrong.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bruce Compton on Thursday, July 05, 2018 - 12:11 am:

The two main causes of surging are: lean mixture and/or too much spark advance. My guess is that the mixture is too lean so try opening the dash control 1/2 turn (counter clockwise) and if that doesn't fix the problem then raise the float level slightly. You might want to make sure that the intake manifold is tight against the block (4 clamps).Checking the initial timing would be next on my list if the fuel adjustments didn't solve the problem.Good luck : Bruce


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Strange - Hillsboro, MO on Thursday, July 05, 2018 - 12:14 am:

I concur with Bruce, lean mixture. :-)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Hal Schedler, Sacramento on Thursday, July 05, 2018 - 01:06 am:

Maybe float level???


Top of pagePrevious messageNext messageBottom of page Link to this message  By kep on Thursday, July 05, 2018 - 06:31 am:

Or put a jug under the carb' and open the bowl, if there isn't lots of flow, just a trickle mine does the exact same think. I couldn't lean all the hair out of the fuel line so i blew it back into the tank from the carb' end. That fixed it for a year.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Duey_C west central, MN on Thursday, July 05, 2018 - 11:24 pm:

Silly question maybe. Can you hear the "beat" of the engine out of the muffler? Might help.
A poor running engine will make the rr, rr, rr of the rear axle sound worse. When slowing down, the RRRrrr (where the heck is the down arrow on this keyboard?!!) from the rear end is normal as far I know and I'm not sure I know. :-)
Unless something is mucked-up in the rear end...??? Have you checked/gone thru the rear axle? Please be certain the rear axle is up to snuff.
I'm happy I have straight pipes on two of my T's and took the guts out of a muffler on another. So I can hear.
:-)


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