[Mgs] SU HS4 Lifting pin?

[riverside]

This puzzles my feeble brain.
If we are already lean,  why would making the mixture richer (maybe that is 
not what really happpens, but it would seem the natural consequence of 
raising the needle without increasing
air flow) make the engine less "happy.
Could someone please explain this.. Thanks

art d
----- Original Message ----- 
From: <menno.meijer at i-shirt.nl>
To: <mgs at autox.team.net>
Sent: Thursday, August 09, 2007 7:18 AM
Subject: [Mgs] SU HS4 Lifting pin?


> Gentlemen,
>
> I'm trying to set the mixture of my SU carburettors correctly. The 
> documentation
> I have describes, in my words, the following behaviour:
>
> - Press the lifing pin
> - The following behaviour could be observed
>  - RPM drops / engine stalls. (Too weak)
>  - RPM increases and stays increased. (Too rich)
>  - RPM increases shortly and then drops just above the level it had prior 
> to
> pressing the lifting pin. (Mixture correct)
>
> Now my question: Do I have to press the lifting pin shortly then release 
> it and
> wait for the described behaviour? or is the described behaviour noticable 
> for
> the duration that I lift the lifting pin?
>
> Thanks in advance,
>
> Menno
> '63 MGB
> _______________________________________________
> riverside at cedar-rapids.net
>
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>
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