What can I use to keep a engine at a certain idle no matter the load?
We built a home made Backhoe. Its a engine out of a 1968 Ford F 350 4.9 I think. Engine runs fine stars right up, Problem is when under a load it dies. Is there a way or something that will keep the idle at steady either idling or under load?
I would think a simple solenoid like is used to up idle for AC use on a carburated engine would do unless the loads are varying by a large amount… You'd just have to find the best way to rig in a switch for it.
Won't happen because it is LOAD determinant.
Add a manual choke.
Diesels use governors. Not sure how you would do that with a Ford gas engine. It would take a great deal of circuitry.
Maybe this would work, I have no idea.
As load increases, manifold vacuum drops. You could rig a vacuum dashpot (vacuum advance mechanism off an old distributor) to hold the throttle closed against spring pressure then as vacuum drops the spring would pull the throttle open a prescribed amount. Not hard to do if you're handy.
You need a governor. A typical old farm tractor or a briggs engine uses a mechanical centrifugal governor to control the throttle to maintain a set speed loaded or unloaded. Belt driven governors exist. You could source one off broke down equipment or search for a new kit for sale if they still make them. Search: belt driven engine speed governor.
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