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8 / 10 hp brass exhaust fitting sizes

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Jon Lewis
Member
Username: spinning_props

Post Number: 5
Registered: 05-2007
Posted on Monday, August 13, 2007 - 07:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Gents,

Anybody sure of the thread type and size on the 'engine side' of the ST brass exhaust? It comes in at just over 2.1" OD and, as every other thread on the engine itself is BSF, I would guess it's 2" Fine. However comma does the Whitworth system extend up to this size? It's certainly not BSP. Have tried 2", 2 1/4" and 2 1/2" BSP fittings with no succcess.

Any advice would be gratefully received. I've nearly finshed rebuilding the ST4 and intend to use the MA's silencer on it.
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Peter Ogborne
Senior Member
Username: peterogborne

Post Number: 212
Registered: 09-2002


Posted on Tuesday, August 14, 2007 - 12:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Jon...it is one one and three quarters BSP.That is two and three thirty seconds of an inch outside diam.Depth of thread.580,Threads per inch [TPI] 11. Probably hard to find ,I made my own out of brass,if you want a pic let me know.
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Jon Lewis
Member
Username: spinning_props

Post Number: 6
Registered: 05-2007
Posted on Tuesday, August 14, 2007 - 03:19 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Peter, I will see whether any of the local plumbers' merchants keep them. Please could you send your photo to a_shadow_of_my_former_self@hotmail.com

Jon

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