How to Tune your engine with a VAC gauge!
#1
Posted 07 March 2007 - 01:44 PM
#2 _LX8VD69_
Posted 07 March 2007 - 06:29 PM
#3
Posted 07 March 2007 - 06:51 PM
This is obtained by advancing the dizzy till the vac guage stops comming up, usually you back it off a tad and see if it drops a little to ensure you haven't gone too far, check it and cross reference with a timing light, and then set the mixture the same way, this also helps with run on as you can get the idle screw in as far as possible. Rock the mixture screw as well to see you haven't gone too far too.
always, as recomended, set a base line for hot cams as they will give a lower vac reading due to the lumpy idle.
If it pings on setting it up this way i would assume you need higher octane fuel or your advance is comming in too soon or you have too much total advance dialed into your dizzy.
Edited by ALX76, 07 March 2007 - 07:05 PM.
#4
Posted 07 March 2007 - 08:01 PM
This will allow the idle circuit to fully function and stop the carb pulling fuel from the main circuit.
Edit; i have found that you may have to go back and forth between the dizzy and the carb once or twice especially if the last tuner got it wrong.
Edited by ALX76, 07 March 2007 - 08:03 PM.
#5 _ToranaGuy_
Posted 27 February 2008 - 11:09 AM
Cheers
ToranaGuy
#6 _EXLXSL_
Posted 27 February 2008 - 03:39 PM
#7 _maxpower1000hp_
Posted 28 December 2008 - 09:51 PM
Thanks to ALX76 for finding this info with a great animation!
http://www.secondcha.../public/186.cfm
top site, being using one for years, old school the only way
a vac gauge, a voltmeter, compression gauge, stethoscope and timing light, that`s all you need for a perfect runing motor, l have tried a dyno, waist of time and money, and car lost 2 tenths down the 1/4, or was it the tuner ooh mike
#8 _Big T_
Posted 13 August 2011 - 04:37 PM
#9 _triumph202_
Posted 16 January 2012 - 06:43 PM
Perhaps it should be read in conjunction with the above posts?
I know I have had a play with the vacuum guage method and I seemed to be just advancing the timing further and further......
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