[Healeys] carb lifting pin

[David Porter]

Here's the way it works, IMO... what is important is what changes are heard
in the first second or two.. it speeds up or dies or nothing at all. 
 The throttle butterfly is in a fixed position so when the piston is lifted
the airflow across the jet head is "disrupted" or kills the velocity might
be better. (probably a better word out there, but my dog just bit a
neighbor's dog and I'm a bit distracted). So if it picks up slightly it is a
little rich or lean if it slows.
 As I mentioned last week, it's better to err on the rich side for the
reasons mentioned then.
 I'm heading in to the couch or the animal control center soon, so I may not
be able to defend my explanation till later...
dave

frogeye at porterscustom.com

Porter Customs   2909 Arno NE
Albuquerque, NM USA 87107
505-352-1378
1954 BN2  1959 AN5
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-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of Bob Spidell
Sent: Monday, October 17, 2011 5:13 PM
To: Bob Johnson
Cc: Healeys
Subject: Re: [Healeys] carb lifting pin

There's an inexpensive SU tuning kit that is little more than a couple
plastic tubes you stick in the inner part of the vacuum piston, and a couple
of bent wires you stick in the tubes (there's also a handy jet-centering
'tool;' it's almost worth buying the kit just for that). 

Anyway, you put the tubes in the vacuum pistons then set the wires in so
they point exactly to each other. Then, when you lift the pin you can see
the wire rise; the wire is about 1/32" thick so when it rises one of its
widths you're close. 

Yes, the pin goes up a ways before it contacts the base of the vacuum
piston. 

Bob 


-------------------------------- 
Bob Spidell - San Jose, CA 

----- Original Message -----


The fuel mixture thread talked about the lifting pin. Does anyone have 
a good way to tell when you have raised the pin 1/32"? On my car it 
seems as though the pin raises maybe 1/16" before it feels as though 
it is contacting anything and then I start to raise the needle. Is 
this right? How can I tell if I'm actually raising anything and when 
have I raised the pin 1/32" when I can't see anything? 

Thanks, 

Bob Johnson 
BJ8 
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