[Mgs] setting jets in su's

Rick Lindsay rolindsay at yahoo.com
Tue Mar 3 12:27:54 MST 2009


Just pokin' fun Alan.  Nothing more. :-)

rick


--- On Tue, 3/3/09, Alan Costich <alan.costich at pictometry.com> wrote:

> From: Alan Costich <alan.costich at pictometry.com>
> Subject: RE: [Mgs] setting jets in su's
> To: "Rick Lindsay" <rolindsay at yahoo.com>, "Bob Howard" <mgbob at juno.com>
> Cc: mgs at autox.team.net
> Date: Tuesday, March 3, 2009, 1:23 PM
> Rick,
>
> >>>> especially for those who can't count
> to two!<<<<
>
> Ouch!
>
> If I may, the following is from Manley Ford:
>
> "I have saved the following advice I got from Craig
> Chima several years ago.
>
> (Craig holds several SCCA National Championships in
> numerous cars running SU carbs - all of which he constructed
> and maintained personally.  Lately he4s moved to vintage
> racing, both supporting his brother Derek4s very quick
> Midget and preparing Loti and other very fast cars)
>
> Fuel should be visible in the jet tube (remove the carb
> dashpot and piston and turn on pumps to see where it
> settles.  We actually set the jet tube height relative to
> the top of the bridge and NEVER subsequently touch the jet
> height (i.e. don't mess with raising/lowering the jet
> with the screw at bottom of the carb).  We've found that
> top of the jet should be between /.060 and .065 below the
> top of the jet bridge.  Best atomization happens with this
> "jet drop."   With the jet higher than that, the
> fuel actually "mists" too much, and with the jet
> lower than that, it actually "puddles" and
> doesn't atomize well enough.  Once the jets are set
> relative to bridge height, the next step is to set the fuel
> level in float bowls.  You should see the fuel about
> 1/8" to 3/16" below the top of the jet tube.  Any
> higher and it's likely spilling over when the motor
> fires/vibrates.  Blow down in jet tube (with pumps running)
> to see where the fuel level
> settles."
> -Manley Ford
>
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