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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
big TT carbs
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<blockquote data-quote="vibrac" data-source="post: 54679" data-attributes="member: 60"><p>I was looking for 1-3/8" bore (as was pointed out earlier I remembered about the 1-7/16 special Amal TT's that were made without realising they were even biger than I am contemplating) certainly I would not think any engine I could build would need bigger than 1-3/8 for short circuit Vintage racing in UK indeed thats what the port in my new Godden head has, so an 1-5/16 would be a good compromise it would not be the first engine that went well with a port slightly bigger than the carb, so what MM suggests may be a solution( though I would doubt my lathe work standards could accomplish it<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" />). Now the concept has rolled round in my head for a few days I seem to remember when Ron opened up his 1-1/16 TT to 1-3/16 that he did something with the main jet position so that it did not stick up to far into the rebored body and remained at the same height as it was with the 1-1/16 at this distance in time I cant remember if he a cut off the brass tube or put a spacer underneath. Does that sound like a good modification?</p></blockquote><p></p>
[QUOTE="vibrac, post: 54679, member: 60"] I was looking for 1-3/8" bore (as was pointed out earlier I remembered about the 1-7/16 special Amal TT's that were made without realising they were even biger than I am contemplating) certainly I would not think any engine I could build would need bigger than 1-3/8 for short circuit Vintage racing in UK indeed thats what the port in my new Godden head has, so an 1-5/16 would be a good compromise it would not be the first engine that went well with a port slightly bigger than the carb, so what MM suggests may be a solution( though I would doubt my lathe work standards could accomplish it:(). Now the concept has rolled round in my head for a few days I seem to remember when Ron opened up his 1-1/16 TT to 1-3/16 that he did something with the main jet position so that it did not stick up to far into the rebored body and remained at the same height as it was with the 1-1/16 at this distance in time I cant remember if he a cut off the brass tube or put a spacer underneath. Does that sound like a good modification? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
big TT carbs
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