wankel REPAIR - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-26-2008, 06:24 PM   #1
Second time around
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wankel REPAIR

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I am looking for different ideas on how to repair this wankel muffler mount .I think JB weld is out of the question so .
what next aluminum welding or what .
Please suggest your ideas .
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Old 01-26-2008, 08:06 PM   #2
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I used JB weld to hold a carb on a 46 I had ... lasted about 2 years before it gave out ... but with the extra mass of the muffler it may not stand up as per your thoughts ... unless you could support the mass off the muffler another way ... ie. using a metal strap around muffler ... just a thought.
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Old 01-26-2008, 08:07 PM   #3
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re: casting repair

Hi Ken, ouch that one's a bit ugly.

A couple of ideas - IF you are considering a weld repair, the only process I would recommend is TIG, also called heliarc. This method imparts the least amount of heat to the part thus minimizing warpage. It is also the best to use for finely detailed aluminum parts. The key factor would be finding someone with a high degree of skill to do the job. Also, you will need to have access to some decent machining equipment to restore the mounting boss to shape and dimension.

A second option and probably easier to accomplish would be to fabricate a steel sleeve to fit over the remains of the mounting boss. It may require removal of the closest fin, but at least you can save the engine. You would file, or otherwise make the outside of the existing boss round and straight, press on the sleeve (with muffler retaining holes already drilled and tapped). Then fabricate a dowel the same diameter as the muffler inlet and insert in the port. You can then fill in the missing material in the original boss with JB weld or high temp epoxy. After it sets up, remove the dowel, clean up the area and you should be good to go. Important point - use a material for the dowel which the JB weld won't adhere to or coat the dowel with something. PVA (polyvinylalcohol) a fiberglass mould release product comes to mind. It is water soluble so if necc, the part can be soaked to soften it.

I hope at least these ideas give you a start.

Robin Boomsma
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Old 01-26-2008, 08:15 PM   #4
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Hi, I have the same engine and that part of the engine is not aluminum.You will have to take it apart for any kind of weld repair.I'd also be concerned about warping the part by welding.

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