Hi!
Dar
The Magnum .45 is a modern engine and doesn't need an idle bar plug (no modern engine does) and the carb is as good as any on the market!

Quote:

ORIGINAL: jaka

The Magnum .45 is a modern engine and doesn't need an idle-bar plug (no modern engine does) and the carburettor is as good as any on the market!

Jan,


I never implied that it does need the idle-bar.

I just wrote that it was not necessary to throw such a glow-plug away; because even an engine that does not need an idle-bar plug, will run with one just the same.

There is no reason to prefer an idle-bar plug in a modern engine.
But if this is what is installed in the engine; or the only plug you have on hand, then just run it, because there is no reason not to.

A little update from today. Got flying with a break in the weather, yay! I flew my combat plane a bit with the OS 8 plug in it. She seemed to do fine. I read in the bolly book that it mentions a glow plug should seat in the cyclinder head to where the plug should be level with the inside of the "bowl" of the cylinder head or just below. The OS 8 I had to remove the gasket that came with it so make it do so. It seats about 1 or 2 threads below the bowl which I don't think causes an issue? Or maybe I should just go get a long one? BUT, I noticed the engine today, Magnum GP.25, had been fitted with a long before I switched it today. The long though goes well past the bowl! This makes me confused on glow plug seating?
Second, tried to get the tower 46 running today. Got it to run, but couldn't quite tune it. It would do fine except when going full, the engine would reach max RPM then choke out unless I brought the throttle down?? I played with the high and low needles but no good result. What do you think?

When the Tower 46 gets at full rpm on the Tower muffler, it goes lean compared with the way it was at upper midrange.

Hi!
Don't remove the washer!!!!!!! It vital that it is there!
The OS and Enya glow plugs are somewhere in between long and short and are just fine as they are. No one removes the washer just because the plug are not flush with the inside surface of the combustian chamber .

jaka,
What is the purpose of the washer then? I did several tests last night and a long plug does not fit fush with the head, even with a washer The #8 and A3 ones though are perfect without a washer. ??

w8ye,
How do I compensate for it going lean? It wants to die after 3 seconds of being at max rpm. Maybe more tuning on my part??

To prevent combustion gas from leaking. It may seem to hold flipping the prop but may leak when running and there is a lot more pressure on the combustion stroke than when flipping the prop. Running it that way may cause the hot gas to erode the threads over time.

The washer are to adjust compression ratio in the engine, do not remove cylinder head gasket if the the gasket are removed. In case set the gasket at place before cylinder head are screwed at place. If knocking are still there, add more cylinder head gasket to lower compression ratio.

Hi!
Jens ! We are talking about the glow plug washer ...not the head shim!
Glow plug washers (of copper) should never be removed! And when ever you remove the glow plug a new washer should be used.

Indeed, it is the glow plug washer we are talking. LOL! The terms to use that all will understand! Pat, I would like to buy a vowel Thanks for the info on the washer. Will put them back on with the new fox plugs i got today. Thanks for the help as always. Tomorrow looks good for weather so will head out and try to get the tower engine tuned so it doesn't die at full power [8D]

Hi!
FOX plugs????

I've had three of the Tower 46 Pro engines. I always used the Tower Power plug in them and they ran fine. The Tower plug appears to be like the OS 8 or OS A3 plug. Not sure which?

I have a friend that has run a Tower 76 with the same Tower plug for 5 years.

Indeed, fox. Durable, strong, reliable, and easy to find the right kind for your engine! Located here... [link=http://www3.towerhobbies.com/cgi-bin/WTI0091P?&C=GME&V=FOX]Fox Glow Plugs[/link]

Also, found a great link last night that has good info on glow plugs and uses... [link=http://www.scootworks.com/rdrc/gloplugs.html]Glow Plug Info[/link]

the copper washer is a crush gasket. seals the plug to the head.

Hi!
...And should be replaced whenever you change plug! Never keep old washers!

I have always reused them.