Evolution Muffler Woes
06-12-2006 | 10:21 PM
#1
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From: Summerville, SC
Evolution Muffler Woes
Purchased two Evolution 46NT engines a few weeks ago.
Got one mounted (cowled and a pain to take out over and over again).
I've had nothing but problems with one of the engines. Won't idle, transition problems, etc. Not 100% sure what the problem is but I know we have tried every setting within the limiters. Replaced every fuel line, tried 8 or so different glow plugs, and swapped out with a new tank. Still not reliable.
Noticed that when the engine was running that the muffler was rotating like crazy. Disassembled by unscrewing the flat head screw (how about a allen head next time?). JB Welded the long screw and let dry over night. Low and behold, it continues to rotate.
Took the muffler from the yet to be run engine, JB welded the long screw to the end cap and end nut and same problem. Spent fuel runs like crazy at the mid section of the muffler and usually rotates to the point where it will probably fry my covering on the fuse.
Talked to Horizon Support this morning and they say send both engines back and that there are no problems at all with these mufflers. (I must be the crazy one) I am but tried to not let on.
Ended up taking both motors back to my LHS and exchanged them for two OS 46 AXs. Never had a problem with the OS motors.
Is this a bad muffler design or just me? Thought I would like the evos since a friend has one that seems to run extremely well. I did notice he changed his muffler on his also due to the same issue. My LHS also indicated that he had one other fellow in there ordering a new OS muffler for his evo as it was also rotating with no way known to NASA to stop the rotating and losening.
Any thoughts or experiences?
Regards,
Hank
Got one mounted (cowled and a pain to take out over and over again).
I've had nothing but problems with one of the engines. Won't idle, transition problems, etc. Not 100% sure what the problem is but I know we have tried every setting within the limiters. Replaced every fuel line, tried 8 or so different glow plugs, and swapped out with a new tank. Still not reliable.
Noticed that when the engine was running that the muffler was rotating like crazy. Disassembled by unscrewing the flat head screw (how about a allen head next time?). JB Welded the long screw and let dry over night. Low and behold, it continues to rotate.
Took the muffler from the yet to be run engine, JB welded the long screw to the end cap and end nut and same problem. Spent fuel runs like crazy at the mid section of the muffler and usually rotates to the point where it will probably fry my covering on the fuse.
Talked to Horizon Support this morning and they say send both engines back and that there are no problems at all with these mufflers. (I must be the crazy one) I am but tried to not let on.
Ended up taking both motors back to my LHS and exchanged them for two OS 46 AXs. Never had a problem with the OS motors.
Is this a bad muffler design or just me? Thought I would like the evos since a friend has one that seems to run extremely well. I did notice he changed his muffler on his also due to the same issue. My LHS also indicated that he had one other fellow in there ordering a new OS muffler for his evo as it was also rotating with no way known to NASA to stop the rotating and losening.
Any thoughts or experiences?
Regards,
Hank
06-13-2006 | 02:18 AM
#3
Senior Member
My Feedback: (14)
RE: Evolution Muffler Woes
ORIGINAL: winterhank
Purchased two Evolution 46NT engines a few weeks ago.
Got one mounted (cowled and a pain to take out over and over again).
I've had nothing but problems with one of the engines. Won't idle, transition problems, etc. Not 100% sure what the problem is but I know we have tried every setting within the limiters. Replaced every fuel line, tried 8 or so different glow plugs, and swapped out with a new tank. Still not reliable.
Noticed that when the engine was running that the muffler was rotating like crazy. Disassembled by unscrewing the flat head screw (how about a allen head next time?). JB Welded the long screw and let dry over night. Low and behold, it continues to rotate.
Took the muffler from the yet to be run engine, JB welded the long screw to the end cap and end nut and same problem. Spent fuel runs like crazy at the mid section of the muffler and usually rotates to the point where it will probably fry my covering on the fuse.
Talked to Horizon Support this morning and they say send both engines back and that there are no problems at all with these mufflers. (I must be the crazy one) I am but tried to not let on.
Ended up taking both motors back to my LHS and exchanged them for two OS 46 AXs. Never had a problem with the OS motors.
Is this a bad muffler design or just me? Thought I would like the evos since a friend has one that seems to run extremely well. I did notice he changed his muffler on his also due to the same issue. My LHS also indicated that he had one other fellow in there ordering a new OS muffler for his evo as it was also rotating with no way known to NASA to stop the rotating and losening.
Any thoughts or experiences?
Regards,
Hank
Purchased two Evolution 46NT engines a few weeks ago.
Got one mounted (cowled and a pain to take out over and over again).
I've had nothing but problems with one of the engines. Won't idle, transition problems, etc. Not 100% sure what the problem is but I know we have tried every setting within the limiters. Replaced every fuel line, tried 8 or so different glow plugs, and swapped out with a new tank. Still not reliable.
Noticed that when the engine was running that the muffler was rotating like crazy. Disassembled by unscrewing the flat head screw (how about a allen head next time?). JB Welded the long screw and let dry over night. Low and behold, it continues to rotate.
Took the muffler from the yet to be run engine, JB welded the long screw to the end cap and end nut and same problem. Spent fuel runs like crazy at the mid section of the muffler and usually rotates to the point where it will probably fry my covering on the fuse.
Talked to Horizon Support this morning and they say send both engines back and that there are no problems at all with these mufflers. (I must be the crazy one) I am but tried to not let on.
Ended up taking both motors back to my LHS and exchanged them for two OS 46 AXs. Never had a problem with the OS motors.
Is this a bad muffler design or just me? Thought I would like the evos since a friend has one that seems to run extremely well. I did notice he changed his muffler on his also due to the same issue. My LHS also indicated that he had one other fellow in there ordering a new OS muffler for his evo as it was also rotating with no way known to NASA to stop the rotating and losening.
Any thoughts or experiences?
Regards,
Hank
-----------------
Most epoxies get soft at around 300 degrees Fahrenheit. Even high temp epoxies have rather low temp ratings.
Next time you run into a tough exhaust problem with a glow engine, try to find some silicone glue (not caulking) and apply that to the thoroughly cleaned bare metal. I haven't seen the silicone fail yet in stopping such problems. However, the metal surfaces to be glued must be absolutely free of oil/grease. This is one application where you do not want to buy a cheap or unknown brand of silicone glue. I've always had great results with GE brand.
You must have one heck of an LHS if they let you return used engines, although you did not say that he gave you full credit for them.
I'm a little leary of Horizon's housebrand engines after their MDS fiasco. I have to admit that I do have one of their Evolution 26 GT engines, but that is supposedly made by MVVS, so it isn't more Russian %*?+.
Glad you got the situation resolved.
06-13-2006 | 08:29 AM
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From: Whitehorse,
YT, CANADA
RE: Evolution Muffler Woes
I have 2 Evo 1.00 and had the same problems ..but ... have two fixes for you. One: on the muffler where the two half's join I drilled a small 3/32 hole and used a very small sheet metal screw ..this stopped the rotation of the muffler...Two: If you take the blue ring off and make sure that the throttle barrel is closed ...count the number of turns in till closed ...then back the needle back out 1 1/4 turns....your midrange and transition should be greatly improved 
Cheers
Cheers
