[Healeys] Vacuum take-off on Weber manifolds.

[Oudesluys]

Double barrel Webers and DellOrto's generally do not use a vacuum 
advance or retard system, so the the distributor used with these carbs 
is a Lucas 23D or 43D, the ones without the vacuum capsule. The advance 
at idle is usually initially set at around 10-12 degrees BTDC, but one 
should play around a bit to get the best setting. The advance curve 
depends on the level of tuning of the engine.
You need a vacuum take off for the brake servo. Usually done from one 
carb but you could make up a sort of balance pipe, but make sure that 
you have restrictors in those as not to have influence from one carb to 
the other. Webers/DellOrto's and similar normally do not have balance 
pipes fitted. You have to set them up very accurately individually.

Kees Oudesluijs
NL

Simon Lachlan schreef op 18-4-2014 18:03:
> I am in the throes of putting 3 Weber 45s on my MkII BT7. This has been a
> long process, mainly because I've been away from home and idle when I
> returned.
>
>   
>
> However, I'm near the rolling road stage for the final setup(!!hoho??) and
> there are a number of issues to resolve..............
>
>   
>
> I have a 123Ignition on my car. A nice bit of kit in my opinion. With SUs
> there would have a vacuum take-off from one of the 3 inlet manifolds as
> fitted to my tricarb. Now, I've had mixed advice as to this. Someone on the
> list said that Webers aren't suitable for vacuum take-off for advance and
> retard. Simple as that. The supplier said that they'd not had any luck
> trying it. BUT the 123's manufacturer implied that it should be done, but
> that steps should be taken to avoid flutter(?). He suggested putting a fuel
> filter in the vacuum line.
>
>   
>
> I should appreciate thoughts on this whole area. At the moment I have this
> set-up:-
>
> The 3 manifolds are all identically drilled and tapped for  vacuum fittings.
> I have joined the 3 manifolds per the balance pipe on the MkII BT7 tricarb.
> Into this pipe I have take-offs for the brake servo, per the tricarb's
> original SU set-up, and the advance and retard. (I did have another one for
> the PCV valve but, when I thought about that, I could see that that was a
> silly idea.).
>
>   
>
> So, what do the Weber gurus think?
>
>   
>
> Thanks,
>
> Simon
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