Jack,
I had the exact same problem. Running too lean, yada, yada, yada. Well, I
also rebuilt both carbs and they ran significantly better, just not at the
point of starting from a dead stop.
The way I solved this was to play with damper oil that goes in the dash
pots. It turns out that the heavier the oil (i.e. closer to the regular
engine oil than to Auto Tranny Fluid), the better acceleration the car will
have. When the throttle opens, gas is "sucked" into the intake manifold.
To compensate, the damper opens and allows a pressure change to reduce the
pressure when the engine is under load. However, under acceleration from
stop, you need a higher pressure to boost the amount of fuel going to the
cylinders. The heavier oil, I use either 10W-40 or 20W-50, causes the
damper to raise slower.
This solved my sputtering problem and my lack of power problem.
Play around with the dashpot oil and you might be pleasantly surprised.
Eric Conrad
Denver, CO
econrad@teal.csn.net
'76 TR6 CF52678U
-----Original Message-----
From: owner-triumphs@autox.team.net [mailto:owner-triumphs@autox.team.net]
On Behalf Of Radley, Jack
Sent: Tuesday, July 27, 1999 6:27 AM
To: 'triumphs@autox.team.net'
Subject: Carb's Rebuilt and it still sputters at low RPM
I had my mechanic rebuild my carbs to eliminate a rough sputter when
pulling away from a stop. The sputter was said to be caused by lean
carbs that could not be adjusted anymore due to worn metering needles,
etc. Prior to the rebuild, he made a temporary adjustment to the carbs
by grinding off a very slight amount of the head (opposite the point) of
the metering needles. This temporary adjustment along with some carb
cleaner in the tank seemed to clear up the problem pretty much. In any
event, I went ahead with a full carb rebuild (at least everything but
the jets themselves).
Now, whenever I am running at low RPM, whether pulling away from a stop
or cruising at low RPM, I get a sputter. If I am leaning on the car and
running it at high RPM the car runs like a champ. Its just at low RPM
that I hear and feel a sputter.
My mechanic is on vacation this week and the car will be going back when
he returns. In the meantime I would like to get a little background so I
know a little more by the time I take the car back.
I read through my Haynes manual last night but carbs are out of my
league.
Any thoughts would be greatly appreciated.
Jack Radley
76TR6
|