View Full Version : Plumbing in a vacuum gauge............
stiller_uk
03-05-04, 10:05 AM
........Where do i take the vacuum feed from?
The back of the inlet manifold
OR
the carb where it also goes to the vacuum advance on the dizzy?
The car is a 1.4 with a weber 32/34.
Thanks
Graham
Snowface
03-05-04, 07:13 PM
vacuum advance on the distributor goes to the back of the weber 32/34.
mikeoxford
04-05-04, 12:02 AM
vacuum advance on the distributor goes to the back of the weber 32/34.
went to the frotn on mine.......
stiller_uk
04-05-04, 08:39 AM
I'll have a go from both, see what gives the best reading.
snapper
05-05-04, 01:27 PM
err, isn't the connector on the back of the weber for connecting to a plenum, airbox flap or something?
stiller_uk
05-05-04, 02:05 PM
I've done the same as mikeoxford.
If u take it from the front there is less vacuum as u open the throttle, which gives the correct reading on the gauge.
If u take it from the back there is more vacuum as u open the throttle, which is wot u want for the timing advance i.e. more throttle>more vacuum>more advanced timing as the engine revs harder.
Snowface
05-05-04, 07:14 PM
really? I read through the instructions that came with my 32/34 and it states the vacuum advance goes to the back.
it says put it on the back for 1.3/1.4 liter models but,
put it on the front one 'For all models with electronic control vacuum advance'.
Now i'm sure mine isn't electronic so i put it on the back.
I showed the tuning mechanic when i got the carb setup and he said that was right for my car.
stiller_uk
05-05-04, 10:09 PM
Yeah the vacuum advance does go on the bk.
snapper
06-05-04, 08:09 PM
you lot sure on this? i'm going to give it a try now.
at any rate, i've learnt something from this thread :)
stiller_uk
06-05-04, 10:25 PM
you lot sure on this? i'm going to give it a try now.
at any rate, i've learnt something from this thread :)
I take it ur running ur vacuum advance from the front of the carb then?!
mikeoxford
06-05-04, 11:41 PM
mine was always connected to the front (back in the day).......
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