Running an engine inverted.....problem?
07-01-2002 | 03:54 AM
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From: bangkok, THAILAND
Running an engine inverted.....problem?
This is my first inverted engine run. It is an old engine which i took off from my trainer plane so there are no run in problems. Engine is a WMB 40 ( german engine from the early 90s) now sitting in a cap21.
The fuel tank center line is same height as carb. Upon tuning the engine the following are observed:
""tune for high rpm at ground level is Ok but upon lifting the nose the rpm drops.
So i back off the high speed needle and try again.The rpm at level is not peaking but when i lift the nose up the rpm peaks.""
when carb is fully open there is fuel spitting out as it is in inverted position.
any checkpoints would be appreciated
bobi.
The fuel tank center line is same height as carb. Upon tuning the engine the following are observed:
""tune for high rpm at ground level is Ok but upon lifting the nose the rpm drops.
So i back off the high speed needle and try again.The rpm at level is not peaking but when i lift the nose up the rpm peaks.""
when carb is fully open there is fuel spitting out as it is in inverted position.
any checkpoints would be appreciated
bobi.
07-01-2002 | 05:27 PM
#2
Running an engine inverted.....problem?
Though I'm not at all familiar with your engine, you might try leaning the idle needle at bit. (Since it is inverted it'll load up quicker at idle than if it were upright.)
I once saw a .07 ABC engine that simply ran too hot. Didn't seem to run right no matter what we did. The owner switched to 20% all castor, raised the tiny tank a little, and it now runs cooler without the previous problems. I mention this since your engine may run better on a little more castor in the mix.
You probably should also:
-check for air leaks and seal anything that is suspicious
-check pressure fitting in tank to make sure air flow is not impeded in any way
-try a new glow plug
-flush out main needle barrel backwards to remove possible blockage
I realize these may be elementary things that you have already tried but sometimes we forget things
.
(I had an upright engine doing very similar things. Turned out a piece of the main needle O-ring had lodged itself between the needle and it's sleeve inside the carb.)
Good Luck and tell us what you find,
Jeff
I once saw a .07 ABC engine that simply ran too hot. Didn't seem to run right no matter what we did. The owner switched to 20% all castor, raised the tiny tank a little, and it now runs cooler without the previous problems. I mention this since your engine may run better on a little more castor in the mix.
You probably should also:
-check for air leaks and seal anything that is suspicious
-check pressure fitting in tank to make sure air flow is not impeded in any way
-try a new glow plug
-flush out main needle barrel backwards to remove possible blockage
I realize these may be elementary things that you have already tried but sometimes we forget things
.(I had an upright engine doing very similar things. Turned out a piece of the main needle O-ring had lodged itself between the needle and it's sleeve inside the carb.)
Good Luck and tell us what you find,
Jeff
07-01-2002 | 05:46 PM
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From: Humble, TX
Running an engine inverted.....problem?
I just installed a .53 Irvine inverted in my Seduction Freestyle, and was having quite a difficult time getting a low idle....it worked great at 3/4 to full....I riched up the idle adjustment, and now it purrs........I have it set at such a slow idle now, that I'm sure it's going to die at any moment...but never does!!! If you dont have one of these engines.....get one!
