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Exhaust port thread OS 4stroke copy

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frank killan29/09/2008 20:31:00
55 forum posts
Hi everyone out there,  I wish to make an exhaust system for an SC 160 4 stroke flat twin (OS copy) in a radial cowl. Can anyone tell me the thread size in the exhaust ports.  Thanks.  Frank Killan.            
Nick Lambert07/10/2008 12:47:00
9 forum posts

Don't jnow that engine Frank but I did an OS 91FS exhaust extension a while back and it was a metric thread and .75 pitch. I think my OS 1.20 FS has the same thread pitch too. I know it was an unusual size and when I checked the taps and dies for it were quite expensive so I cut the threads on the lathe.

Nick

frank killan08/10/2008 21:44:00
55 forum posts

Thanks Nick, I have since used the original exhaust pipes and some bendy pipes from Mick Reeves to an exhaust collector ring a friend made for me. I wish I had a lathe ,I can use one but cant afford one ,maybe one day.  

 Frank

Nick Lambert09/10/2008 10:07:00
9 forum posts

 Frank

 If your interest in getting a lathe keep an eye out on ebay. Old industrial types pop up from time to time at really good prices. I got mine, a Colchester Student 1800, from a machine refurb company and with hind site I paid a bit over the odds. However, I did manage to pick up a really decent series 1 Bridgeport milling machine for 600 quid from ebay.

 Nick 

frank killan09/10/2008 16:03:00
55 forum posts

Thanks for that Nick.

Frank

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