Best thing to do and cheaper in the long run is to book a dyno for a day
and try to replicate the problem. If it's a good dyno you'll be hooked up
to electrickery and mixture measurements and you'll be able to crack it
easily.
Peter Westcott
----------
From: Larry Miller <millerls@ado13.com>
To: Spridgets <spridgets@autox.team.net>
Subject: Constant Speed Sputter
Date: Saturday, 17 April 1999 1:51
I have posed this puzzle to the list before but since we have a lot of new
people I thought I would try it again.
The engine in my Bugeye runs great 99% of the time. When driving at a
constant speed in 4th or 5th above about 3500 RPM it will occasionally
start
to sputter real bad.
If I let off the throttle, press the clutch, and let to RPM's drop to idle,
the miss goes away. No other action will make it stop. I've tried less
throttle, more throttle, etc. and it just keeps sputtering until I let it
go
to idle.
This happens randomly but always under the same conditions. It never
happens
around town in stop and go driving, only on the open road. Some times after
a mile or so, some times after 20 or 30 miles, some times never.
This engine has been in two different cars with different fuel and wiring
systems.
One car has a new gas tank with all new 1/4" gas lines and the other has a
"renu" gas tank with all new 5/16" gas lines.
The following components have been installed in just about every possible
combination:
1. Three different carburetor and manifold setups, 1.25 SU's, Weber DGV
downdraft, and Weber 40 DCOE.
2. Two different distributors, a stock vacuum advance and an Aldon Yellow
centrifugal advance.
3. Three different fuel pumps with and without a fuel pressure regulator at
various pressure settings.
4. Three different coils, a stock Lucas coil with external ballast, a hot
Crane coil with external ballast, and a Lucas
sport coil.
5. Various types of plugs, plug wires, points, distributor caps, rotors,
etc.
Larry Miller "A Fool (For LBC's) And His Money Are Soon Parted"
59 Bugeye (Being Ripped Apart)
60 Bugeye (Willie Nelson)
78 911 SC Targa (Faster than a Bugeye but not as much fun)
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