1QwkSport2.5r

That's what I would probably do until I found an OE unit from FEEbay.

earlwb

On these older style large frame engines you can use clamp on mufflers easily enough. I use a old Slimline muffler on my .78 engine and a Davis Diesel Development muffler on my .60 engine. You have to remove the exhaust baffle if the engine has one on it. You also make some sort of a plug for the two end holes that the exhaust baffle went through. The early OEM muffler had special ears or tabs that allowed for the exhaust baffle, so you didn't have to remove it. The later .78 engines use a muffler that still had the ears on it, but there was no exhaust baffle by that time.

Broken Wings

My Feedback: (20)

This is the late model with muffler lugs on the side.

Broken Wings

My Feedback: (20)

Somebody had to say it...

earlwb

Fox quit selling the Lustrox stuff many years ago. Maybe middle 1970's or so was the last they sold the stuff. But they may have stopped selling it before then. It was for the lapped piston engines, not the ringed or ABC engines.

Well many years ago many companies sold engines like how Fox made and sold them. Some of those engines required a lot of reworking to get them to run too. Some of those companies were much more worse about it. It really sucked to buy a exotic foreign engine and it needed to be reworked before you could use it even. Serious reworking not so much simple stuff. Like having to fit a new piston as the piston was too small.

So the engines have come a long way from way back then too. So yes I can agree that maybe Fox hadn't quite modernized their methods enough.

But now that pretty much leaves Jett Engineering as the last American model glow engine company making engines in the USA. MECOA is a big maybe as they aren't really making anything much now either.

But I do have to say that the Chinese company Sanye (ASP, etc) has come a long way and is generally making pretty good engines. They have to be subsidized somehow to make them so cheap.

74SEVEN7

Re. FOX "Lustrox", it might be interesting to learn that the great Peter Chinn was not averse to using it. Read the "Performance" section of his 1980 test of the FOX 36 RX - and it had the alloy piston !
http://sceptreflight.net/Model%20Eng...ox%2036RX.html

Charley

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Funny that he used it because he thought the engine had a tight bearing.

CR

74SEVEN7

I may be wrong here (we need an expert engineer's opinion) but I suspect that "Lustrox" worked like this - it would have maximum abrasive effect on tight, closely fitted items (such as a tight bushed bearing) and correspondingly less effect on looser fitted mating surfaces. Even Duke himself recommended caution in using "Lustrox", but in the case of Chinn's Fox 36RX, it may just have needed that pinch of powder to free-up the bearing, whilst having little effect on the other fits.

Charley

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I forgot that the engine in the article was a bushing type. Made sense to use the Lustrox.

CR

1QwkSport2.5r

A ringed bushing engine no less.

74SEVEN7

There were lots of those

earlwb

Well Fox used a extra super fine grade of garnet powder for the Lustrox. It was so fine that it would suspend in the oil film and not grind or polish anything. But if there was a high spot someplace then the garnet would get squeezed into the high spot and polish or grind it down until it wasn't a high spot anymore. Anyway that was how Fox explained that it worked. So in a engine that didn't have any wear points or high spots the lustrox wouldn't wear anything out. I remember him demonstrating it one day. He daubed in a whole package of the stuff into a engine that was running, and it didn't appear to hurt the engine at all. I don't suggest anyone repeat it though. But it was quite interesting at the time.

Now using Lustrox with a ball bearing engine is not good, as the bearings would come close to contacting the races, and the Lustrox garnet powder may actually wear the bearings out.

aspeed

Hmmmmm, I used to use the Silvo compound in my old Rossi .15 bearings to give a little more clearance. They were going over 30,000 rpm, and I thought they would run more free. (freeer looser, cooler whatever) Isn't grease just oil mixed with a very fine clay? It doesn't seem to damage anything if it is fine enough.

earlwb

Yes, I now remember some guys doing that with the BB racing engines too. I never tried it myself. The premise for using it in a BB racing engine makes sense actually. Whether it works or not would be the real question. Modifying a racing engine is one of those things, where you keep changing something until it quits working right and then you toss that one in the trash can and pull another one out to have a go at it again.

Bill Adair

My Feedback: (1)

I'm certainly no expert, but the theory of selective abrasion in a running engine just doesn't make sense to me.

Sure, the tight spots may be polished a bit faster, but the high pressure areas on the crank pin, and crank shaft must certainly wear prematurely as well. Duke was a master designer, and superb salesman, but wasn't he also a master of hype! <G>

Bill

Zor

Grease is a mixture of oil and soap.

The soap keeps the oil ( the lubricant ) where it should be instead of spreading all over.

Zor

aspeed

Oh. I guess that is better than mud then :-)

aspeed

Sometimes you can shim liners and do things that can be reversed, new heads, venturis, but yes, sometimes you use the trash can. I am afraid to port a piston any more for that reason.

Charley

My Feedback: (2)

This Lustrox deal has been analyzed to death. In Model Airplane News magazine (MAN for short), Duke Fox would publish a column called "Dukes Mixture." He wrote about Lustrox in a couple of them. Now, you have to understand that Duke loved CL Combat. If you went to a AMA Nats, the CL Combat circle was where you'd find Duke; him, his Rolls and his chauffeur. I went and talked to him a few times when I was working the Nats.

Anyway, Lustrox was a means to quickly break-in his iron-piston engines and their crank bushings. That's what Duke wrote in MAN and that's what he told a few of the CL guys when I was lurking around. They went through a lot of engines in CL Combat!

Oh well, just the ruminations of an OF......

CR

Sport_Pilot

Actually they use stearic acid, it is found is soap and is found in animal fat, it is the substance that keeps soap and fat in a solid or simisolid state but is not actually soap or fat itself.

Zor

Thanks Sport_Pilot for more precice information.

Our sources of knowledge are not always fully satisfactory.

Zor

hsukaria

Folks, I am looking for a good Fox 45 piston liner for rebuilding mine. The one I have is pitted a little It might be ok, but it's good to try with a better liner. I am willing to pay or trade. Thanks.

Cougar429

My Feedback: (3)

Can you post specs and a pic or two? May have something here.

hsukaria

I don't have them on me now, I will have to wait to this evening. I put in a new Bowman piston ring and compression feels quite good by hand turning. I have not run the engine yet. I thought I could try for a better liner if I can get one. Otherwise, I will go ahead and run it with the old liner.

VampeD4

My Feedback: (80)

did you try Fox ?? http://www.foxmanufacturing.com/inde...ndex&cPath=143