Guy,
This is not meant to be insulting but sometimes little obvious things get
overlooked.....did you slacken the throttle linkage clamps next to both
carbs to allow the carbs to work independently of the accelerator shaft?
You can't set proper balance if the throttle shaft between both carbs is
fastened tight.
If you're good on this then try using the front carb as the starting point
for balancing by turning the idle screw down to raise the idle to a point
where you can say you've actually raised the idle by turning the screw. Set
the UniSyn to that flow rate then go the rear carb and set its idle screw
to achieve the same Unisyn flow rate.
Once you've dialed in a balanced flow rate, tighten the throttle shaft
clamps, give the throttle a few good blips to settle things down and adjust
each idle screw up or down equally to get the desired idle speed.
Providing that everything else is "okay", this should balance your carbs.
Chip Krout
Delaware Valley Triumphs, Ltd.
Skippack, PA
1962 TR4 CT2052L
In a message dated 6/4/2013 6:16:34 P.M. Eastern Daylight Time,
guy@genfiniti.com writes:
Greetings All,
I've recently found myself with some free time, and am looking into those
low
priority items on my punch list.
First up is trying to get my engine to purr, as I've always had a rough
idle,
with the RPM vacillating over a range of roughly 125, but smooths out while
driving.
I believe the issue might be indicated by something odd with my carbs (SU
HS6), which I had rebuilt by Paltech.
Here's the scenario..
I am using a Uni-Syn tool to balance the air flow (main idle).
The weird thing is that I achieve balance with the front carb's screw not
touching at all (therefore the throttle is not opened at all), and the rear
carb's screw is engaged (thus opening the throttle).
If this is correct, it means I am getting air flow balance from one carb
completely closed, and the other partially opened, which should not happen.
I'm planning on checking for a vacuum leak, and hoping I find one.
Is there anything else I could look for?
Maybe the throttle in the front carb is NOT closing all the way, even
though
the idle screw is not engaged?
Maybe the cylinders aren't creating an equal amount of vacuum?
Thanks in advance!!
Cheers,
Guy D. Huggins
1965 Triumph TR4A
CTC 63569LO
Online project diary at http://www.genfiniti.com/triumph
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