Posted by Ken Macfarlane on January 30, 2012 at 03:43:38 from (156.34.142.102):
I've got a turbo perkins in my Massey with 4300 hrs, it works fine, and works fine under load with the following exceptions:
-It has a hunting idle, it will just wander up and down, especially if you disturb it a bit by starting to move a bit them pushing the clutch in, then steadies out over several minutes. While doing this it almost stutters like its missing.
-When the engine comes into a load, it will sort of stumble for a sec then catch itself and sometimes overshoot the rpm it should be at. An example is running the haybine in a hilly field, it will be fine cutting accross the slope, then when turning up hill it will lose 200 rpm in the first couple of secs, then surge ahead and overshoot by 200 rpm the next few secs, then fall back to the set rpm while making the stuttering/missing sound like it does at idle. Basically it doesn't like transitions in power output.
I've not done much work with diesel motor or turbos, but my brains is saying there shouldn't be anything that causes missing under load like this. It would seem to be related to the governer or some type of boost regulator, but I still don't see how to make it stutter under load.
If it was a change in fuel flow causing air to get sucked in, it should be on the supply side of the pump and should be a delay instead of so instant, and should cause a problem at full fuelling. But the thing will pull fine at full power once it gets stabilized.
Does the governor change the timing in the injection pump?
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