Re: [T3] Too much advance

[Ben Doughney <ben_d@clear.net.nz>]

<x-flowed>On 28/04/2004, at 7:09 PM, Mark @ Mo-Sys wrote:

> I would like to understand more what is going on with the vacuum 
> signal. The
> port in these throttle bodies is just a small hole in the wall just 
> below
> the throttle butterfly in its idle position. As the throttle is opened
> slightly the tip of the butterfly passes in close proximity over the 
> hole
> and then the hole is above the disc so I'm guessing that at that point 
> there
> should be low vacuum in the port. But at idle I would have thought 
> there
> would be quite some vacuum there?

My Fastback with carbs has a vacuum port in the throttle body, which is 
unused (I presume that is use for dual vacuum distributors), and the 
one I have connected up is the one in the carb body, on the left rear 
face as it sits in the car, about 10mm up from the throttle body joint.

HTH,
Ben Doughney

'63 1200 - Ringo
'71 1600TL
'65 1500N - Val
'70 411L Variant
'70 NSU Ro80

http://members.tripod.com/~superkafer/
http://www.vwownersclub.co.nz

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