[Mgs] setting jets in su's

[Alan Costich]

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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