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#1 Vac port for distributor: where on the carbs is it ?
Posted: Thu Oct 13, 2016 4:55 am
by Durango2k
Hi guys,
I may be blind, but I cannot find the vaccuum connector on the carbs, to connect the distributor hose to.
Where is it ? Is it one of the (thicker) copper pipes ? I have thicker and thinner pipes on my (original) carb set. It may fit to the thicker ones, diameter-wise.
Thx !
Carsten
#2 Re: Vac port for distributor: where on the carbs is it ?
Posted: Thu Oct 13, 2016 5:58 am
by JagWaugh
Carsten,
On the HD carbs there is a flat area on the upper rear part of the body casting, about 20x30mm, just above where the butterfly is. One of your carbs should have a white metal cast bit about 5mm thick with a brass pipe or fitting sticking up. This is where the distributor vacuum connects to the carb end.
See page c.3 of the 3.8 E shop manual, fig 1, part 4.
This is the same for HD6 and HD8 carbs. Some carb bodies are not drilled, some are drilled and blanked off with a plate, and some have a plate with a vacuum takeoff, either a plain brass tube, or a threaded union nut fitting.
Andrew
#3 Re: Vac port for distributor: where on the carbs is it ?
Posted: Thu Oct 13, 2016 5:29 pm
by Durango2k
I have one very thin copper pipe on the front carb, it's slightly bent.
This may be it- and someone doodled around with a rubber hose.
I'll follow this trace first.
Thanks !
Carsten
#4 Re: Vac port for distributor: where on the carbs is it ?
Posted: Thu Oct 13, 2016 9:10 pm
by Durango2k
Okay, found it. It is on the front carb on top. They even stamped "IGN" into the base plate !
Now, I have a 3 mm copper pipe, and a 5-6mm alloy port on the dissi.
How to match them - was there a special short rubber adapter from 3 to 5 mm, or would I just get 5 cm of 3mm tube and squeeze it over the 5m ?
Carsten
#5 Re: Vac port for distributor: where on the carbs is it ?
Posted: Thu Oct 13, 2016 9:37 pm
by PeterCrespin
Buy the relevant parts from J38.
Pete
#6 Re: Vac port for distributor: where on the carbs is it ?
Posted: Fri Oct 14, 2016 8:11 am
by Mich7920
Hi Carsten,
Beware that the hole which is under the small flat part where you fit the copper pipe is free.
Mich
#7 Re: Vac port for distributor: where on the carbs is it ?
Posted: Fri Oct 14, 2016 8:18 am
by Durango2k
PeterCrespin wrote:Buy the relevant parts from J38.
Pete
Jaguar C21573:
http://www.sngbarratt.com/ProductDetail ... 29f239&l=7
Carsten