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123 ignition no vacuum connection
https://www.ausmini.com/forums/viewtopic.php?f=5&t=56072		 Page 1 of 1
Author:  jamie85063 [ Fri Aug 14, 2009 9:09 pm ]
Post subject:  123 ignition no vacuum connection
Hi i just bought an 123 ignition distributor and it has no vacuum port to connect to there is a screw in the side of the unit where i believe the port connection should be have i been sold a dud? or is the connection just missing and been replaced with the srew?the manual that came with the unit shows an vacuum sensor connection and says to disconnect the vacuum tube when fine tuning the ignition.So the big Q where is my vacuum connetion?should i have one? :roll:
Any help greatly accepted.

thanks jamie
Author:  kiwiinwgtn [ Fri Aug 14, 2009 10:18 pm ]
Post subject: 
There is more than one model of the Dizzy, one with and one with out the vacum unit. A+ non A+ etc

Check with the suplier

Kiwiinwgtn
Author:  awdmoke [ Fri Aug 14, 2009 11:03 pm ]
Post subject: 
Most have no vacuum & are strictly mechanical advance
Author:  jamie85063 [ Fri Aug 14, 2009 11:12 pm ]
Post subject: 
Is having no vacuum advance going to reduce fuel economy at part throttel becouse im wanting to set the motor up for economy over power as i believe the vacuum advances the timing under high vacuum to improve fuel economy is this right?
Author:  awdmoke [ Sat Aug 15, 2009 10:24 am ]
Post subject: 
Correct
Author:  Flute [ Sat Aug 15, 2009 12:26 pm ]
Post subject: 
Mine has the vacuum port which I have capped because I am using a 45 Webber. You might be better swapping yours for the same one with the port. If it is still unused and you got it from Ted Cross in Melbourne he will swap it for you.
Author:  drmini in aust [ Sat Aug 15, 2009 4:19 pm ]
Post subject: 
awdmoke wrote:
Correct

"If you have a cam with 270° or more duration, having a vac advance connection will do little for economy. You may think it works when watching the strobe light in neutral, but under way there is insufficient part throttle vacuum to advance it".
Quotation: from Graham Russell.
Author:  jamie85063 [ Sat Aug 15, 2009 5:19 pm ]
Post subject: 
Hi this distributor is going on an 850 that will have a 12g202 head and supa pipes with RC40 exhaust standed cam and bottem end at this stage.So i think i need the vacuum advance on the dizzy?
Author:  drmini in aust [ Sat Aug 15, 2009 8:49 pm ]
Post subject: 
Yeah it won't hurt to have it then. :wink:
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