[Fot] Weber tuning help please

[TeriAnn J. Wakeman]

A couple of questions:

Are these new carbs or used and have you verified the same jets and 
chokes on each?

Is that black coating something you painted on or is it something that 
might have required some sort of dipping process (maybe partially 
clogging a passage)?

Have you verified that the carb mounts do not have an air leak? Your #3 
might have an air leak at the base.

2500 -3000 RPM is the RPM range where the idle circuit is transitioning 
to the progression circuit.  Your idle jet size and mixture screw 
adjustment may be giving you a lean condition as you are transitioning 
between the idle circuit and progression circuit.  And also check to see 
that your progression holes are open.

TeriAnn

http://www.tr3a.info/WeberDCOEinfo.htm


On 5/3/15 11:40 AM, Jim Gray via Fot wrote:
>
> I just installed my webers and I’m running into something not covered 
> in anything I’ve read so far.
>
> At cruise speed which I do on the street, 2500  -3000 RPM my exhaust 
> gas temps on # 4  are 100 plus degrees
>
> over # 1and will climb to 1400 if I stay at that throttle setting. 
> Under wide open throttle they equalize and seem
>
> to settle in at about 1300.
>
> However, I think this may be symptomatic of my other issue. When I’m 
> tuning the idle air screws, open them up until
>
> it starts to miss & so on, I can get a predictable stumble from three 
> out of the four screws.
>
> The screw on # 3 has no effect on the idle no matter how far I run it 
> in or out.
>
> Also , when I put my syncrometers on #’s 3 and 4 they are 
> significantly different.
>
> I’m not going to get my dyno tune before the first race in two weeks 
> so I’m left to figure it out on my own for now.
>
> Any help would be greatly appreciated,
>
> Jim g
>
>
>
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