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Post by atshed on Feb 1, 2015 10:23:16 GMT
so having now got the rs flats purring I thought it may be of use to get some other opinions regarding idle mixture tuning. for myself I have always done this by ear and tacho meter . although I have now heard mention of using vacuum gauges. any thoughts on the best and most successful technique ? cris |
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Post by greasemonkey on Feb 1, 2015 11:26:57 GMT
My vacuumate has a rpm couter built in that I use for the idle mixture. I dont know how you balance your carbs but you could use this for the mixture.
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Post by atshed on Feb 1, 2015 14:11:33 GMT
have always done the synch with gauges ,or ball bearing drop method if no gauges to hand. just never tried out the idle mix with gauge method.
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Post by arnout on Feb 2, 2015 19:23:40 GMT
Errrmm.. You're mixing up two things.. Balancing (or "synchronising") the carbs and adjusting the pilot circuit are different things.. So the idle a/f mixture cannot be adjusted by equalising the carb operation mechanisms, but has to be done by tweaking the pilot screws (and/or jets)..  |
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Post by dago on Feb 2, 2015 19:54:37 GMT
you can do it with vacuum gauges ,you turn the mixture screw till you get the highest reading the gauge may only move a fraction depending how sensitive the gauges are some might not move at all then re balance carbs,or you can use a colour tune,or the highest idle method.you may need to go up a size or two on the pilots to keep it 1/4 to 3/4 range ,1 1/2 turns roughly equals one size up ,have fun
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Post by atshed on Feb 2, 2015 23:47:21 GMT
Errrmm.. You're mixing up two things.. Balancing (or "synchronising") the carbs and adjusting the pilot circuit are different things.. So the idle a/f mixture cannot be adjusted by equalising the carb operation mechanisms, but has to be done by tweaking the pilot screws (and/or jets).. sorry perhaps I did not explain myself properly carbs are balanced ie in synch with each other which I do using either the ball bearing drop method or by using gauges. however having said that I am asking as to whether or not adjusting the idle mixture ( yep using the idle mixture screws) by gauges has a lot of good results. as I have always adjusted by listening to engine.
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Post by atshed on Feb 2, 2015 23:55:13 GMT
you can do it with vacuum gauges ,you turn the mixture screw till you get the highest reading the gauge may only move a fraction depending how sensitive the gauges are some might not move at all then re balance carbs,or you can use a colour tune,or the highest idle method.you may need to go up a size or two on the pilots to keep it 1/4 to 3/4 range ,1 1/2 turns roughly equals one size up ,have fun yep you got what I was trying to say - adjusting idle mixture by using gauges.
good results with this technique ??
I have always trusted my " sound of engine/revs " technique with 99% good results after 20 mins or so.
but never to old to learn new tricks !!
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Post by dago on Feb 3, 2015 20:17:29 GMT
they all pretty much the same as the highest idle will give you the highest vac reading i just find it easier with gauges as you can concentrate on one cylinder at a time and it's easier to see what's going on than listening or watching rev counter,colour tune is also good but tends to involve burnt fingers and knuckles
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