| [ Total Views: 1024 | Total Replies: 11 | Thread Id: 82581 ] |
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 Old Hutcho
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| posted on March 16th, 2010 at 05:28 PM |
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Vacuum take off point for kadrons?
does anybody know how to get a vacuum signal out of a Kadron carb so I can use a vacuum advance distributor??
My engine is basically stock 1916 with an Engle 110 cam and twin Kads. I am looking at taking all of the driveability and tune issues out of it and
this is one thing I am looking at.
regards
Old Hutcho
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Uber Kafer
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| posted on March 16th, 2010 at 05:47 PM |
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here is a pic, I 'borrowed' it off the web somewhere, so the credit goes to 'unknown'..
Remove the throttle body from the carb, and drill out the aluminium plug.
If you follow the hole it comes out just above the throttle plate. I used an old vac takeoff tube from an old carby, it was a perfect fit. That
port is tight against the stock fan housing on the left side carby, so you might consider doing it on the right hand carby.
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Old Hutcho
Officially Full-On Dubber
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| posted on March 16th, 2010 at 07:02 PM |
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Uber Kafer
Brilliant. Thanks for that. Have you noticed any improvement using a vacuum advance distributor after you did that mod?
regards
Old Hutcho
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t2
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| posted on March 16th, 2010 at 07:21 PM |
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you also need to plug this hole in the throttle body
gravity wont get you high
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Uber Kafer
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| posted on March 17th, 2010 at 01:16 PM |
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I havent fired it up yet, just did it 2 weeks ago and sorting out other issues first. However, that approach is the way to go, just a few variations
are available on the net.
t2.... whats the theory behind plugging that hole? I've seen it reccommended on some sites, but not on others. From what I can see it sits below
the throttle plate when fully closed, but once off idle its all in the same flow... so whats the story there?
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t2
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| posted on March 17th, 2010 at 03:36 PM |
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I am also learning this process and from what i have read on it so far this is why.
That port needs to be blocked so it creates the proper vacuum signal for the distributor, the vacuum port also should not give any vacuum signal at
idle as the engine does not need the distributors advance or assistance at idle.
gravity wont get you high
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Uber Kafer
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| posted on March 18th, 2010 at 05:38 PM |
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and that makes sense.
thanks.
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t2
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| posted on March 18th, 2010 at 08:25 PM |
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If you have vacuum at idle you will have manifold vacuum.
If the vacuum enters below the throttle plate ,it then becomes manifold vacuum. Manifold vacuum gives you more advance at idle.
i have been informed that as a rule of thumb vacuum advance distributors almost always use ported vacuum.
SVDA distributors need ported vacuum, that is the port above the throttle plate. the vacuum only comes on when the throttle plate is opened.
The vacuum port you drilled into the carb body will pull the vacuum through a venturi controlling the amount of manifold vacuum to the distributor
once the throttle plate opens.
gravity wont get you high
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Craig Torrens
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| posted on March 18th, 2010 at 08:29 PM |
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Do you have the balance tube fitted between the two manifolds ?
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t2
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| posted on March 18th, 2010 at 08:45 PM |
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i havent got that far yet, some people say yes 100%, others say no way.
i am going to try it both with it and without just to see the difference
gravity wont get you high
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Craig Torrens
A.k.a.: Craig Torrens
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| posted on March 18th, 2010 at 08:47 PM |
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You MUST run the balance tube between the manifolds..........non negotiable !
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t2
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| posted on March 18th, 2010 at 08:48 PM |
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there you go i will put one on then
gravity wont get you high
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