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Engine basics => Engine set up tips => Topic started by: Frank Sheridan on May 13, 2009, 05:04:57 PM
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Hello all - I just acquired a Fox 35 stunt with a hemi head and stuffer. What muffler keeps the neighbors and the motor happy? This 35 has the over and under bolt pattern, but I doubt if anything but the stock Fox unit fits this.
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It will probably need a strap-on.
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If you locate a stock muffler, be sure to Locktite the screws. I lost one off my 29 in flight, but it was easy to find. I think the screws are 3-48, yep just a little odd. Fox made mufflers with lugs for your verticle setup plus the newer end mounting. Try the classified, maybe some kind soul will have a muffler to fit.
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Frank
Make sure the bottom hole doesn’t go all the way though or you will have problems starting. Personally I think that particular shiny silver case fox is one of the best of the fox 35 engines. They seem to have more power and start easier then other fox 35 engines. Good for Foxburg.
Willis
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Brodak TM-1 with straps required.
Wayne
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A tongue muffler may keep the motor happy, but definetly not the neighbors. I found that the older type tube style using a radiator hose clamp works well. I should say works ok but not as good as the tongue type. It still requires the opening to be drilled out as large as the exit will allow. I have used the older OS Max mufflers using my own strap with success. It didn't fit perfect, but pretty close and the noise was moderate. Ken
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Scott Riese made a beautiful tongue muffler for my old Fox 25 that has the same mount arrangement as yours. As I recall the cost was reasonable.
Glen Wearden
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Frank, I couldn't get my answer to your PM go through, but I think you can get Scott's address from the PAMPA directory ( can't locate mine). Don't know if he makes his living doing this, but in any case, I think you'll be happy with his work, and he's pretty reasonable.
Glen Wearden
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Frank, I think I may have a tilt-up Fox muffler (NIP) for this bolt pattern.They made a up and down tilt for this one , just like they do now for the end lug pattern.I had 2 at one time, a few years back. Let me check tomorrow and I'll give you a call.
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Frank, I have the correct muffler, its used but very seviceable. Send me a PM if interested.
Thanks
Wayne
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I have used the older OS Max mufflers using my own strap with success. It didn't fit perfect, but pretty close and the noise was moderate.
I have used the OS 20-25 baffle engine muffler from the 1970s- 1980s with good success. I had to grind it flat and then I take 1/16" gasket material (thick is good).. cut a slightly over sized piece and permatex it to the muffler .. let it dry over night.. then use a new #11 xacto to trim the outside and inside, when trimming "push" the blade in short cuts this prevents pulling the gasket loose .. I use the gasket material to prevent the muffler from slipping in flight.. replace the phillips screw with a hex and you are good to go. As an added bonus... this muffler set up works well on profile models. If you crash the muffler is knocked out of place rather than broken... I used this on a Fox 35 with Hemi/stuffer back plate..
A tongue muffler would probably be the way to go... I was just cheap... and had several mufflers to "play" with.
Jim
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Frank, be aware that using a hose clamp or any other kind of "strap type retainer that goes around the cylinder can (and will) cause the case to warp. That will ruin your engine. The only way to clamp on a muffler is to use a "horse shoe" type clamp that sholders up againse the back side of the exhaust stack so there is no pressure placed on the major portion of the case.
Bigiron
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I adapted the Enya 19 muffler with a clamp on mine