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Anyone got the ' soup up ' artical as published , in M,C,M, etc . 143 & 12 here .
https://commando.yolasite.com/performance-mods.php thisis them .
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Nov. 73 Rawlins 850 .
- Thread starter Matt Spencer
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Anyone got the ' soup up ' artical as published , in M,C,M, etc . 143 & 12 here .
https://commando.yolasite.com/performance-mods.php thisis them .
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Forsooth .
There was info , similar to these , in a British Magazine . At that time . ( of course , they had to think they could do it better . ).
There was info , similar to these , in a British Magazine . At that time . ( of course , they had to think they could do it better . ).
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& Egad .
SO , it is IN the July 1974 Motor Cycle Mechanics ! . ( which is on E bay . wots wherethe pictures from . Now We Know ! .
SO , it is IN the July 1974 Motor Cycle Mechanics ! . ( which is on E bay . wots wherethe pictures from . Now We Know ! .
...and the ebay seller only wants £23.56 for a copy! I assume that he's a member of this forum.....& Egad .
SO , it is IN the July 1974 Motor Cycle Mechanics ! . ( which is on E bay . wots wherethe pictures from . Now We Know ! .
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At that time there were Amal concentric 1036 ( And 1038).....
ilikevelos
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I have a 10/38 on my late velo thruxton.
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I had a pair of 1036 MK1 Concentrics on my Rickman Norton 850 in 1976. However, it had an Ex Thruxton short stroke style fully hemisphered head with 34mm inlet ports, very large valves, and Omega pistons with an ex Thruxton cam. The motor will have been very similar to that used by Dave Croxford in the space frame in 1974 for 1000cc class races.
Early '77 I replaced the 36mms with a pair of 34mm Mk2 Amals. Having been nagged by everyone that the 36mms were too big. Turns out they weren't. So I had the 34s bored to 36mm. (I run 36mm Mikunis on my short stroke 750 today with a Fullauto head).
Standard practice in the '70s was to use 32mm Mk1s, bored to 33mm. JPN did that too.
A lot of the bikes ran in the production class, so the mod (cheat) wasn't visible.
Boring a 32mm Mk1 to 34mm would have most likely ended up with air flowing past the side of the slide and would not have been recommended.
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Perhaps I should have added to my own post that the head on this engine was ported by John Baker, the other half of the Baker/Rawlins drag race team. I don't recall meeting John, but his big ports certainly worked with big carbs.
I knew Dave Rawlins from my first season of club racing and when I wanted to build an engine for my Rickman project he sent me to the guy who owned the parts I used, and engineer who had just been made redundant by the experimental department.
And 1034 as well.
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Yep ;
with the Dew Kati , having 32 Carbs . on the G T . and 40 .m., on the real one . SS , one thought that the Norton could do with a bit of carburator , too .
with the Dew Kati , having 32 Carbs . on the G T . and 40 .m., on the real one . SS , one thought that the Norton could do with a bit of carburator , too .
