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        Discussion need help with an o.s. Max 46fx.

#1 microairman1 Oct 20, 2012 08:55 PM

need help with an o.s. Max 46fx.
someone gave me a used o.s max 46fx today and i need to find a muffler,new glow plugs,and what fuel it uses. Also what can i clean it with cause it has some dirt and stuff on it. I dont know much about glow engines the only engine i have are cox .049. Basiclly anything i will need to get it running. any help would be great. Also if anyone knows of a good piper cub arf or kit that uses this engine that would be great. Thanks

#2 Hemikiller Oct 20, 2012 09:15 PM

A good ARF Piper Cub for that engine...


The Great Planes Cub 40 is a good kit...


Link to the manual for the 46FX


It can use 0% to 15% aircraft glow fuel with 18% oil content. I prefer Wildcat Premium Extra 15%, but others have different fuel preferences and it depends upon what is in your area. I should have a couple spare 46FX mufflers, shoot me a PM. I prefer OS glow plugs, they recommend the #8 or #6 (old A3), depends on the fuel and prop you use.

At the very least, you'll need a glow ignitor, chicken stick and a glow plug wrench, plus some way of getting the fuel into the tank, whether it's a squeeze bulb, hand crank or electric fuel pump. On the higher end, you'll want to get an electric starter and field box etc.

#3 microairman1 Nov 09, 2012 07:05 PM

would it work with 25 or 30%?

#4 jeffie8696 Nov 10, 2012 01:15 AM

It depends, what kind of fuel. I see most 25 and 30% fuels are for RC cars and will not have enough oil content. It is has a MINIMUM of 18% (more is better) you could surely tune the engine with a cold plug and run the high nitro.

#5 datsunguy Nov 10, 2012 01:23 AM

5 to 10% nitro is all you need. I use Enya #3 glow plugs but any good plug will work. All my fuel uses 10% nitro and 20% lube, mostly castor oil.

#6 scrub monkey Nov 10, 2012 02:42 AM

I ran 10% nitro, 20% oil in the 46 fx that I had. Ran fine with an amazing idle.

#7 OldRookie Nov 10, 2012 09:34 AM

Here is a good muffler for the 46FX. This muffler will give you more RPM than the stock muffler, and it is way cheaper.


Here is the glow plug that works well with the 46FX.



#8 DarZeelon Nov 10, 2012 11:34 AM

It is not in the manual, but OS strongly advises to use fuel that contains a reasonable amount of castor oil (not all-synthetic fuel).

Also, the OS #6-#8 plugs are medium-reach will remain slightly recessed in the head, when fully tightened.

The effect of this is that the plug 'behaves' cooler than it really is.

There are good, inexpensive long-reach plugs available, such as the K&B-1L, which will better fit the engine.
OS offer their own LC4 plug, which fits much better in this engine and works better (according to my experience) than the OS #8.

#9 OldRookie Nov 10, 2012 11:48 AM


You are certainly correct.
I am just relating my experience. I use 20% nitro and this seems to work better with the #8 than it does with the #4.


#10 jeffie8696 Nov 10, 2012 12:10 PM

I use Merlin Glow Plugs, I have great luck with the Merlin 2006 in high nitro applications, it is a cold plug.

#11 microairman1 Nov 10, 2012 12:30 PM

if i dont have a muffler and its got good compression what do you think i could sell it for cause i dont do the larger stuff right now.

#12 microairman1 Nov 10, 2012 12:32 PM

and thanks for all the help.

#13 jeffie8696 Nov 10, 2012 12:40 PM

I would give Brucercengines.com a call and see if he will take it in trade or buy it outright. If you are into smaller engines he has a few, the .16 comes to mind.

#14 microairman1 Nov 10, 2012 02:35 PM

do you possibly have a phone number?cant seem to find one.

#15 jeffie8696 Nov 10, 2012 03:55 PM

Here ya go, it has contact info through his website. http://www.brucercengines.com/

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