Further to Paul's comments:
Check the level of the oil in the dashpots. If too low the mixture is lean
for accelleration as the pistons rise too fast. MG specified motor oil for
top-up.
Did you install a pressure regulator with that aftermarket pump? It would
not seem that the stumble would caused by excess fuel to the carbs, but one
supposes it's possible that a regulator might not respond quickly enough to
increased demand for fuel.
Bob
---------- Original Message ----------
From: Malcolm Jeffcock <msjeffcock@eastlink.ca>
To: mgs@autox.team.net
Subject: [Mgs] hesitation
Date: Sun, 15 Aug 2010 22:29:18 -0300
well as some know I have installed a "new" engine which I must say is pretty
good-compression of 150lbs across all 4. I have had electronic ignition
installed and that's fine but I am having a hesitation problem.
When cold its ok or driving around town with a constant variation of revs but
once I start to cruise along with revs at say 3300 and then I try to
accelerate I have hesitation, at time severe, it also seems to be brought on
if I go up a hill as driving at steady rev level, it feels like it is only
running on 3 or 2 cylinders when this happens, feels just like when head
gasket went in the past. If the car is idling in driveway I can rev engine to
high revs without a problem Could it be a situation of the fuel pump being
able to provide enough fuel but not being able to respond to the additional
demand for fuel as required for acceleration?
I should mention that the original SU pump was replaced with an aftermarket
3.5-5.0 lib pump...
I adjusted the fuel mixture to make it richer but that didn't help at
all...any thoughts?
Malcolm
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