I also seem to have a similar problem. After setting up the twin SUs on my
73 BGT I seem to have power fade at higher RPMS under load. Color tune says
I'm right on the money as far as mix goes. I changed the air filters to the
K&N MG plate setup, the dist. has been rebuit, and evben after installing a
new Peco free flow exhaust to repalce the slightly crimped orig exhaust, I
still have this power fade problem. Could it be the Dwell? Carb needle
selection?( SU tune up book says with K&N air filter I should change from
the AUD550 (FX) to the No. 6 needle? Any ideas?
-----Original Message-----
From: Ivan Lawton <w3ike@yahoo.com>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: Tuesday, August 04, 1998 4:56 PM
Subject: Missing MGB, clews needed!
>
> I installed a slightly used very low time rebuilt 18V engine in
>my 79 B last fall. The engine ran perfectly until March 1998 when I
>decided to set it up for the Maryland emissions inspection. Well
>after adding a can of Dry gas to the tank and adjusting the Zenith
>carb to spec it started missing at 2200 RPM to 4200 RPM. The engine
>will not rev over 4200 under load and has no POWER. No load, no miss
>and redline is easily attainable. A compression check indicates in a
>range of 138 to 146 lbs. I have changed the entire engine electrical
>system, carburetor and fuel delivery systems with no improvement or
>change. Oh, BTW the crank to cam timing is dead nuts on as I have
>disassembled the front of the engine to check that. Also there are no
>manifold or break booster vacuum leaks.
>
> My clew bucket is now empty so does anyone have any ideas?
>
> Thanks for your help,
>
> IKE Lawton Annapolis, MD.
>
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