Strap-on mufflers for old engines

I've got some McCoy RH engines...2-.19's & a .35 and I would like to get some lightweight, but effective, strap-on mufflers for them. Who makes what I need?

Eugene S. Chernosky
AMA 639635

I believe Leonard has mufflers that will fit the McCoy .35 RH. I got a strap on muffler from our host for a Veco .35 and I believe that same muffler will fit the McCoy. Anyway, check with Leonard..........T.Durrill

I am sure it was something I did, but I too have an old McCoy .19 (not a red head) that I put a strap on muffler on. It did not run right. Like it lost power. Took the muffler back off.

Thanks
Paul

A lot of strap-on silencers can distort an engine if you do them up too tight. You have to get the right balance, tight enough to stay on, not tight enough to distort. It helps to get perfect flat mating surfaces on both the exhaust stack and the silencer.

I have some homemade mufflers that I run on RH McCoy 35's and 40's. Since both have sub-piston induction, I keep the backpressue to a minimum, and they run with minimal loss of power. They are made from 1"dia alum tube. I use small dope bottle caps for ends. Drill 5 or 6 1/8 in holes in the back.
Scott Dinger is making a light weight aftermarket muffler. Haven't tried one yet but they look good.

I use a tongue muffler from Big Art on my 35RH & 40RH. The machining and fit is A1. Works fine and I made the strap from a strip of brass. The muffler is recessed for the engine exhaust lip and holds it on without pulling the strap too tight. I believe our host sells them.

I purchased two tube mufflers from Scott Dinger to fit O.S. .40LA's. I believe Scott told me he was making mufflers to fit the most popular engines --- don't know if you would want to try to modify one of those to fit a McCoy RH or if you would ask him to make a custom muffler. I have his card at home if you need the contact info.

The mufflers I received from Scott (4 day delivery from across town) are very light. I added a pressure tap and cleaned up the manifold fitting, then polished the outside. They reduced the overall weight and improved the CG location on my igNoblarf (OS .40LA) and my SuperClown (OS .25FSR) compared to the stock OS mufflers. Note that Scott did not sell them to me as being suitable for the .25FSR; I tried one out, it fit and the engine runs fine. The exhaust exits straight back. I noticed Scott was using a rubber exhaust deflector on one of his planes.

LAST EDITED ON Jul-26-04 AT 09:44 PM (CDT)
 
I put this OS Max 25 muffle on my McCoy 35 engine. I drilled 3 holes for bolts and 2 holes for exhaust in a 1/4"x1/2"x1.75" aluminum piece. This muffler patches the bolt pattern of the OS Max 40LA engines.

I use the Tatone muffler on a RH 35 and OS 25 strap on muffler on a Fox 35 with great results. I cleaned up the interior with a dremel on the Tatone. The problem with McCoys are they aren't that powerful and it is easy to push them too much. The weight of the model also shouldn't go over 35 oz for the best performance. The engine will start to sag when pushed, I sometimes wonder if the muffler helps to over heat the engine or acts as a way to disapate the heat. A fiber gasket Permatexed to the muffler helps to seal it to the engine and prevent over tightening. Good Luck

Well, I just got back from Austin, TX...and I checked into every hobby shop they had for 'goodies'. One of them had some clearance stuff and one item was a 35mm film canister muffler set-up. It involved an aluminum disc made to accept the metal top to an aluminum film canister...yea, they're old ones, but I got a couple stashed away! This looks like a slick little set-up and will work on my .19's since they have a exhaust port bar that will accept a screw in the middle. I guess I could shoot a digital picture or two of what I end up with so as to share WTH it is with you guys.

I might have to check with Leonard on one for my .35 and the other .19. Thanks for the info.

Eugene S. Chernosky
AMA 639635