• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

conversion from Zenith to SU

Share this page

Were there any nipples installed on the carb between the throttle disc/shaft and the flange that mates to the intake manifold ?
Some do and some don't. That would be the ideal place for a vacuum line to the vacuum retard unit on the dizzy.
If this is a 72 or later TR6, you have only one vacuum module on your Dizzy, it would be on the firewall side of the dizzy and it is to Retard the timing at idle speeeds and deceleration.
If you have an earlier car with both a Vacuum retard unit and a Vacuum advance unit on the Dizzy, you may look into drilling and taping holes between the throttle disc and mounting flange. OR just blow it off and run w/o the retard. It doesn't come into play that much and probably won't be missed. Try it and see.
 
No, There was no hole into the flange. This is a TR6 73 and the HS6 come from a volvo. (old stuff). There is a nipple unused on th intake manifold. Should I plug it there?

thanks

By the way... What is a Dizzy?

YH
 
Distributor.
Try it, the manifold nipple, that is. I've heard it would work. It can't do any harm to try, the Vacuum Retard has a definite range and it's physically impossible to exceed it's upper limit.
 
I think you will find that the vacuum advance tapping must be upstream (i.e. air filter side, not engine side) of the throttle butterfly on one of the carbs, and the retard tapping (if used) on the inlet manifold.
 
Back
Top