Ed,
If this “stumble”
is only for a second or 2 off idle, I would try first moving the accelerator
pump link rod to a richer squirt. Most carbs have 3 settings for this rod, and
since it is external and no parts are required to change the position, it is
easy.
If your “stumble”
is more prolonged, than maybe Daytona Parts is right.
Today’s gas (10%
alky) does make the engine run leaner. But alky is not literally 'thicker'. It
just has less (about half) burnable material (Hydrogen & Carbon) than
gasoline of the equivalent volume. Alky also has some Oxygen in its molecular
structure. This is why oil companies use the misleading word “Oxygenated”
instead of “gasohol”. Gasohol left a bad memory in many people’s minds when the
initial use of methanol ate the fuel system rubber in many cars. Aside from
forcing us to use renewable fuels, it is the government’s way, in one stroke,
of leaning out the millions of carbureted cars currently on the road to reduce hydrocarbon
emissions.
Dave
Homstad
56 Dodge
D500
-----Original
Message-----
From: Forward Look Mopar
Discussion List [mailto:L-FORWARDLOOK@xxxxxxxxxxxxx]On Behalf Of eddee@xxxxxxxxxxxxx
Sent: Wednesday, May 13, 2009 9:58
AM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: [FWDLK] CARB 'STUMBLE'
off idylle???
Hello Members
I have had
this small 'stumble' in the engine directly when slowly accelerating from
a stop.
I went
through EVERYTHING.
Destrib spark,,timing,,centrif advance,,vacuum
advance,,vacuum leaks,,,,,the carbs were VERY PROFESSIONALLY
rebuilt,,,,,,,,,,and still a small stumble (not even bad enough to be called a
hesitation).
In throwing
around ideas with DAYTONA PARTS--we came up with the answer
AND IT
WAS.................................
GO RICHER ON
THE METERING RODS!!!--not jets
(This would
be applicable to the AFB specifically). But also any other 2bbl or
4bbl that uses metering rods.
Todays gas
(10% alky) makes the engine run leaner.
Its literally
'thicker'.
The hardest
thing for a carb to overcome is transfer from the
idyll system to the main jets when under load.
If anyone
needs detailed info on the rod I had and what I went to just email me off line.
ED ECKERSON
LI NY
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