More engine problems. Help!
#1
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From: Kennewick,
WA
I'm still trying to get this Magnum 1.08 broken in, but am having some trouble.
I think I've got the high end set, so now I'm trying to work on the idle.
Last week I put two tanks of fuel through it without much trouble.
So yesterday I start it up, and re-check the high end, and then try to idle. Here is where it gets strange.
As I get the throttle down toward the last couple clicks, it still idles pretty fast, so I take it down as far as it will go, and it speeds up[sm=confused.gif]
So I try reving it a little to get it to quit, and it won't, so I have to pinch the fuel line to get it to die.
I richened the idle, and it wouldn't start, put the idle back where it was, and still wouldn't start. Unfortunately the engine sits too high on the Dragon Lady so it's hard to keep fuel up to the carb when starting. I think this may be the reason I couln't re-start. I hope.
What's going on with the idle??
Couple more questions.
When I start it, I'm using a technique a guy at the field showed me. Prime the carb, and then flip the engine clockwise and let the compression kick it back the other way to turn it over. It has been working, but is this o.k. to do?
When people say "lean it out" shouldn't they really say "lean it in" since to lean it, you turn the valve clockwise, which is tightening it, and turning it in?
I think I've got the high end set, so now I'm trying to work on the idle.
Last week I put two tanks of fuel through it without much trouble.
So yesterday I start it up, and re-check the high end, and then try to idle. Here is where it gets strange.
As I get the throttle down toward the last couple clicks, it still idles pretty fast, so I take it down as far as it will go, and it speeds up[sm=confused.gif]
So I try reving it a little to get it to quit, and it won't, so I have to pinch the fuel line to get it to die.
I richened the idle, and it wouldn't start, put the idle back where it was, and still wouldn't start. Unfortunately the engine sits too high on the Dragon Lady so it's hard to keep fuel up to the carb when starting. I think this may be the reason I couln't re-start. I hope.
What's going on with the idle??
Couple more questions.
When I start it, I'm using a technique a guy at the field showed me. Prime the carb, and then flip the engine clockwise and let the compression kick it back the other way to turn it over. It has been working, but is this o.k. to do?
When people say "lean it out" shouldn't they really say "lean it in" since to lean it, you turn the valve clockwise, which is tightening it, and turning it in?
#2

My Feedback: (21)
Side mounted engines work better than upright mounted ones. True, some
upright ones work fine, but as in your case....they can be difficult. Possibly
your muffler pressure system isn't providing enough pressure for ease of
starting, and correct flow for operation.
There are some things than can be done to improve the pressure. Make sure
the hole in the muffler fitting is open. Sometimes the hole can be enlarged to
improve the air flow to the tank. If the muffler baffle is missing, the pressure
may be reduced, also hindering pressure. If the hole in the tank clunk is too
small, it will restrict flow. Any pinhole leak in the lines can mess up the whole
delivery of fuel.
The lines should be kept short. If you have a filter in the line, make sure it is
clean, and not restricting the flow. Opening the low end needle a bit, and
running the engine a bit rich on the low end can make fuel flow a bit easier
into the carb.
If all else fails, a Perry pump/regulator will cure all the problems, including
leaning out in a climb or just raising the nose makes it much harder to get
fuel up to the carb. Also the engine can run too rich in a negative "G" loop
for instance....but it isn't normally a problem.
I have a Dragon Lady too....with a Magnum 1.20 mounted inverted. I really
like the plane. [sm=thumbup.gif]
Dave.
upright ones work fine, but as in your case....they can be difficult. Possibly
your muffler pressure system isn't providing enough pressure for ease of
starting, and correct flow for operation.
There are some things than can be done to improve the pressure. Make sure
the hole in the muffler fitting is open. Sometimes the hole can be enlarged to
improve the air flow to the tank. If the muffler baffle is missing, the pressure
may be reduced, also hindering pressure. If the hole in the tank clunk is too
small, it will restrict flow. Any pinhole leak in the lines can mess up the whole
delivery of fuel.
The lines should be kept short. If you have a filter in the line, make sure it is
clean, and not restricting the flow. Opening the low end needle a bit, and
running the engine a bit rich on the low end can make fuel flow a bit easier
into the carb.
If all else fails, a Perry pump/regulator will cure all the problems, including
leaning out in a climb or just raising the nose makes it much harder to get
fuel up to the carb. Also the engine can run too rich in a negative "G" loop
for instance....but it isn't normally a problem.
I have a Dragon Lady too....with a Magnum 1.20 mounted inverted. I really
like the plane. [sm=thumbup.gif]
Dave.
#3
Senior Member
My Feedback: (3)
I think your engine is way off. The high end is a no brainer. The low end is the fun part. If I were you I would do this. Open your high end theeish turns. Open your throttle to an approximate idle position by looking down in the barrel. Remove your fuel line from the carb. Attach a separate line to the carb. Now blow into the line and at the same time-open the low end until you here a hissing noise. You low end is now in the ballpark. Crank it up, dial in the high end and see how the low end is. "IF" you get an idle, this is good but now while its idling remove the fuel line from the carb. If the rpms increase before the engine quits, the low end is to rich. If the rpms go down and quit-too lean. This is in print in some engine manuals.



