Hi List,
I have a few carb questions.
My TR4 has SU H6 carbs and I had them just tuned by a professional
workshop. But still I am not sure if they did a perfect job. The car is
running better than before, but...
When I approach a traffic light or a stop sign I usually let the engine
slow down the car by simply getting off the accelerator and eventually
I push the clutch. The idle then goes down to about 400 rpm the
car starts shaking and the red light comes on (half of the time the
engine then dies on me) and after a few seconds (1 or 2) the idle
comes up to about 800 rpm and runs stable for any length of time.
This can't be normal.
Furthermore I Still have a limitation in the max. rpms under load
(except it now goes up to about 4500 rpm). Earlier I wrote:
>It pulls through to about 4100 rpm and then it is quickly changing
>between acceleration and deceleration maintaining the 4100 rpm.
>My first thought was that the carbs aren't getting enough fuel, but
>now I'm thinking again if maybe the carbs should be adjusted.
>Here is some additional information: My TR4 has K&N air filters,
>an electric fuel pump and SU H6 carbs.
I got an answer by Bruce Clough (BTW, Thank you Bruce):
>Michael,
>Sound like a fuel delivery problem. Can it go beyond 4100 rpm at
>all for any length of time?
>Which electric fuel pump are you using? Do you use any type of
>pressure regulator in front of the carbs? Have you tried a stock
>pump on the engine to see if the problem clears itself up?
Here some Information on the fuel pump:
The electric fuel pump is by Mitsuba Elec. Co., Ltd. model FP-3 and
delivers a pressure of 0.3 kg/c^2. There is no pressure regulator in
front of the carbs (just a fuel filter) and I didn't yet try a different
pump.
And now my questions:
Are these two isolated problems or are they related?
Can I perform the carb tuning myself?
Do I need a CO-meter to do the carb tuning?
Can the engine be seriously damaged if the carbs are out of tune?
WHAT CAN I DO?
Thanks in advance.
Michael
1962 TR4, CT 17613 LO
michael.steinbeck@start.de
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