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Exhaust thread size

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Phil Tandy07/02/2009 16:09:23
2 forum posts
I need to make a special exhaust bend to fit in to my hand built SE5A.  Could some kind person out there tell me the head exhaust thread size for an OS 40 Surpass engine.
 
 
Thanks
 
Phil
Dave Horrell09/02/2009 09:54:22
1 forum posts
Just been through a similar exercise myself modifying the exhaust on my FS 70 surpass.  Looked at 90 degree elbows from various manufacturers, inverted pitts style mufflers, and ended up buying an 'inside cowl adaptor' for the OS flexible exhaust pipe and the manifold pipe from the new FS 81 a.  Took a wee bit of detective work to confirm that all the threads matched, but now the original muffler sits directly behind the cylinder with the outlet on the centreline of the engine.
 
My first post here, hope it helps.
Jim Carss10/02/2009 09:23:10
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2066 forum posts
80 photos
Phil,
 
This is my answer to the problem,use your original header pipe,c
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ut a V notch in it and bend it to 90 Deg.and when you have the right position for your silencer Silver solder the V notch.
 
I know Just Engines want £18 for a right angle bend,too much for us penny pinchin pensioners.
Jim
 
 
 

 

Phil Tandy12/02/2009 18:32:07
2 forum posts
Thanks for your replies,  I have the pipe made now using a dye and then bending the pipe in a press.  Just need to fit to the engine and install in plane.
 
Thanks again
Phil

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