31
Listeroid Engines / Need help with Injector Pump (Minimum Engine Speed)
« on: May 03, 2021, 05:03:49 PM »
Hi All,
Is anyone familiar with the internals of the Injector Pump and whether modifications can be made to the minimum flow point?
I have a project where I would like the engine to run continuous at 250 rpm.
The problem is that when the speed is set any lower than 325 rpm, it cuts out !!!
The governor linkage is quite free and I have tried several springs ranging from stiff to very soft.
Even using my hand on the rack plunger I can control the speed closely down to 325 rpm and the engine stops at any point below that.
I prepared a video to demonstrate.
You will note that as the engine speed hits the current setting (325 rpm) it cuts out, then as it slows below the set point the governor gives a small tug and the engine fires with a thump to bring it back to 325. Then the injector pump stops fuel flow and the same cycle repeats. You will hear a thump every several revolutions as the engine fires and then cuts out to coast again.
https://www.youtube.com/watch?v=n8ZdIOONaOU
I have seen many engines running at very low speeds. So I know it's possible.
Such as this one...
https://www.youtube.com/watch?v=4jTxVD5Vaas
Any ideas for modifications
Is anyone familiar with the internals of the Injector Pump and whether modifications can be made to the minimum flow point?
I have a project where I would like the engine to run continuous at 250 rpm.
The problem is that when the speed is set any lower than 325 rpm, it cuts out !!!
The governor linkage is quite free and I have tried several springs ranging from stiff to very soft.
Even using my hand on the rack plunger I can control the speed closely down to 325 rpm and the engine stops at any point below that.
I prepared a video to demonstrate.
You will note that as the engine speed hits the current setting (325 rpm) it cuts out, then as it slows below the set point the governor gives a small tug and the engine fires with a thump to bring it back to 325. Then the injector pump stops fuel flow and the same cycle repeats. You will hear a thump every several revolutions as the engine fires and then cuts out to coast again.
https://www.youtube.com/watch?v=n8ZdIOONaOU
I have seen many engines running at very low speeds. So I know it's possible.
Such as this one...
https://www.youtube.com/watch?v=4jTxVD5Vaas
Any ideas for modifications