Vacuum advance pipe, wrong way?

[softtop]

In clearing the way to remove the dizzy cap, I removed the vacuum pipe. Did I put it back on wrong? I dont know. On testing the pipe there appears to be no non return valve. The car seems unaffected by having it on either way. Is there a way to tell if it is on right? There are different numbers on each end of the pipe? Help appreciated.


Softtop



>> Edited by softtop on Sunday 19th February 19:21

[tunnelmeister]

Mine runs just as well without it - some say smoother without it - if you leave it off though block the wholes that the tube would sit on with a rubber gromit type thing...

[GreenV8S]

If you have an inline slow-return valve in the vacuum line, it should have an arrow marked on the outside. If the valve is working properly, you will be able to suck through it in the direction of the arrow, but not the other way. It should be fitted so the arrow points towards the dizzy. If in doubt get rid of the inline valve completely and just use a plain vacuum hose.

Some people have found that disconnecting and removing the vacuum line entirely improves the driveability at low revs / part throttle, if you do this just make sure you block off the entry to the throttle body. Personally I suggest you do connect the vac advance, but use a plain vacuum hose without the inline valve.

[softtop]

Thanks for the advice. The one on the car has purpose made ends but does not have any valves in it. Just checking, it may need the timing sorting out so just trying to remove any areas of issue.

Thanks

As always good solid advice.

Softtop