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Con Rods ST#1, #5A

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John Purdy06/11/2018 19:34:08
127 forum posts
43 photos

I have a question for anyone who has built either the ST #1 or the #5A engines. A good many years ago I acquired a number of ST castings including a #1 and a #5A. They were out of their original packing, in separate boxes but were essentially complete. The 5A had some machining done ( not particularly well done) but the #1 was untouched. I have started machining the #1 and having finished the big end bearings yesterday I started looking at the connecting rod casting and it seemed to have a lot of excess material to machine away, so I dug out the one for the 5A and comparing them both with their drawings it appears to me that they might have got switched. In the picture the rusty one on the left was with the #1 castings, the other with the #5A.( all the #1 castings had a coating of light surface rust but the #5A were clean) Can anyone confirm which one is for which engine? Thanks.


JasonB06/11/2018 19:52:44
13722 forum posts
1282 photos

I think it is more to do with when they were produced than what engine they are for, currently both conrods share the same part number.

John Purdy08/11/2018 20:12:43
127 forum posts
43 photos

I had checked Stuart Models web site, spare parts section, and had noted that, as you say, the con rods for both now have the same part number so are probably the same casting ( a cost saving move when Stuart Models took over perhaps ?). I don't know when my castings were bought but I think probably late '60s early '70s making them Stuart Turner castings. I have the parts list for the #5 (but none for the #1) and it lists no part number for the con rod and for all the castings that do have part numbers they are totally different from the current Stuart ones.

If no one can identify them positively I think I will use the non rusted one for the #1 as it is the smaller and the finished dimensions of the #1 are smaller all round except for the distance from the pin to the bottom of the foot which is the same (3 3/8" ) for both.

Edited By John Purdy on 08/11/2018 20:15:18

Edited By John Purdy on 08/11/2018 20:15:41

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