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New guy needs help!

 
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ks114  



Joined: 23 Nov 2016
Posts: 13
Location: Kansas

PostPosted: Sat Nov 26, 2016 6:41 am    Post subject: New guy needs help! Reply with quote

Hi, This is my 2nd post here. Hope you can help. I just bought a 1981 924 with a Weber conversion. The problem is the vacuum advance isn't hooked up.
What port on the carb does it hook to? I Ve got pics of the carbs/manifolds if it helps. Thanks,Steve
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1012
Location: Washington DC area

PostPosted: Sat Nov 26, 2016 8:06 am    Post subject: Reply with quote

Vacuum advance goes below the throttle plate.
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ks114  



Joined: 23 Nov 2016
Posts: 13
Location: Kansas

PostPosted: Sat Nov 26, 2016 8:15 am    Post subject: Reply with quote

Is there a port there that I can put a fitting in?
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The craig  



Joined: 13 Nov 2015
Posts: 8
Location: Brisbane Australia

PostPosted: Sat Nov 26, 2016 8:36 am    Post subject: Reply with quote


There are a few different thougts on this some people take directly off the manifold others go for ported and multiple carbs make it more fun
I would go of the ported vac on the carbs and tee both ports together and to the dizzy
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ks114  



Joined: 23 Nov 2016
Posts: 13
Location: Kansas

PostPosted: Sat Nov 26, 2016 9:59 am    Post subject: Reply with quote

Are the fittings for the vacuum ports readily available at the parts store, or is this a Weber specific part?
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 736
Location: Maysville, Colorado

PostPosted: Sun Nov 27, 2016 1:21 am    Post subject: Reply with quote

I have a completely different setup because I'm at 8000', but the Redline folks had me plug/cap and not use the vacuum advance, go to a zero bypass on the accelerator pump jet(I think that is the right term) and set the ignition advance to about 15 degrees BTDC. At least 5 degrees of that is for altitude.
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muffin787  



Joined: 13 May 2015
Posts: 5
Location: Puerto Rico

PostPosted: Mon Dec 05, 2016 2:19 am    Post subject: vacum advance Reply with quote

I convert my 1980 924 to webber many years ago. I don't use the vacum advance. if you have two side draft, you will notice a pulse vacum. It make very difficult or impossible to set the advance. You will only have to work with the mechanical(centrifugal) advance.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11356
Location: PacNW

PostPosted: Mon Dec 05, 2016 5:43 am    Post subject: Reply with quote

Path of least resistance is to have your distributor recurved for straight mechanical advance. There are many specialists who can readily do this.

Next choice is Ignition 123.
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RC  



Joined: 25 Mar 2007
Posts: 2625
Location: Australia

PostPosted: Sat Jan 14, 2017 6:27 pm    Post subject: Reply with quote

There appears to be a lot of confusion and misunderstanding on the subject of vacuum advance on many forums, including this one. A few minutes googling and reading the theory is a good start, irrespective of whether it is on a 924, Ford, Chevy or whatever, its all the same. The same theory applies equally to modern EFI & ECUs, albeit oriented towards emissions control in preference to performance.

Here`s a few links that should be sufficient but google will find millions more. Opinions vary immensely but the basic facts & theory remain constant.

https://en.wikipedia.org/wiki/Ignition_timing

http://www.gofastforless.com/ignition/advance.htm

http://server1.chevytalk.com/~tony/fusionbb/showtopic.php?tid/58447/

https://www.cartechbooks.com/techtips/fordignition/
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