Thanks. Looks like perhaps I should have ordered the calibration kit in
retrospect. Anyhow, after a 2 week wait, it has arrived so I'll fit at the
weekend.

Quite looking forward to it - my carb experience has been mainly with
multiple SU's (single barrel downdraft) and the odd side draft Weber -
never done anything on a 4 barrel like Holley or Edelbrock before.

Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"c" > wrote in message
...
> Dave,
>
> When the companies that make carb give them their initial settings from
the
> factory, they take all kinds of compromised in to consideration. They
don't
> know if the carb will be used on a large or small displacement engine, or
if
> it will be used in hot or cold climate, high altitude, etc. They also
don't
> know what other mods have been done to these engines. The baseline
settings
> they give these carbs will allow them to run on most of the applications
> they will see, but they almost always require tuning to get them to be
> optimal. My guess would be that this carb would still be a little rich,
but
> it is just a guess. I'm not saying it won't run, it will, and it will
> probably be pretty damn close to right.
>
> The metering rod system that Carter/Edelbrock uses will "adjust" the
mixture
> based on engine vacuum. The rods are controlled by a piston and spring,
> similar to many other carbs. When the engine vacuum is low, the metering
rod
> spring will start to overtake the vacuum pulling the piston down. The rods
> are tapered, and when they move up in the bore they are in, a smaller
> diameter of the rod will still be inside the main jet, effectively
> increasing the total main jet area that fuel can pass thru. If the engine
> runs too rich at high vacuum conditions, but is ok at low vacuum or wide
> open throttle, then you simply change the metering rod to on the has a
> larger diameter on the part of the rod that is in the jet at high vacuum
> conditions. It really is a simple process, and normally will only require
1
> or 2 sets of rods to get the carb where you need it to be.
>
> Chris
>
>
> "Dave Milne" > wrote in message
> . uk...
> > Any idea if the Edelbrock 600cfm 1405 Performer + Edelbrock 2131
manifold
> > will require a metering or jet change on a stock 360 '91 Grand Wagoneer
?
> >
> >
> > Dave Milne, Scotland
> > '91 Grand Wagoneer, '99 TJ
> > "c" > wrote in message
> > ...
> >> Without knowing what size carb, choke or no choke, and which manifold,
it
> > is
> >> hard to tell you what the problem could be. What I can tell you is that
> >> Edelbrock and Holley carbs are both set up from the factory with a
> >> general
> >> tune. This mean the carb may or may not need to be set up properly for
> > your
> >> particular engine. In general, the Edelbrock carbs run too rich with
the
> >> factory set up. Normally they will require a metering rod change, and
> > maybe
> >> a jet change as well. You also don't specify the cam specs.
> >
> >
> >
>
>