James,
This may be way off base, but check the carb's metering needle. I had a
similar problem with my MkII years ago. The needles were loose and rode
up/down the jet, flooding and starving the engine at will.
Mike Welch
'68 +/- Spitfire MkIII
'60 Jaguar MkII
http://home.turbopower.com/~mikew
-----Original Message-----
From: James Carpenter [mailto:jc_carpenter@softhome.net]
Sent: Tuesday, February 16, 1999 10:43 AM
To: Spitfire List
Subject: Hesitation On UK1500 (Dule SU)
Hi there
Went for a long drive Sunday, 70 miles. Anyway I had chance to do some
experimentation on my hesitation problem.
The engin was up to perfect running temperature all these times, and the oil
was at the same temperature.
Case 1.
Dule carrageway accelerating at 60 MPH the car suddenly looses all
acceleration, gets it back looses it all in 1/2 a second, accompanied by the
smell of petrol. No missfire, all cylinders loose it.
Case 2.
Going down hill, accelerate lightly reach 65 MPH and no hesitation. No
smell of petrol.
Case 3. Regular bit of road exactly the same conditions as the dule
carageway, but no hesitation.
Case 4.
In third gear this time, trying to accelerate, but it hesitates a 3500 RPM
with the petrol smell.
The only thing I can think of is the fule pipe to the fule filter (from the
pump) is not very rubbery, this might be leaking. But what would cause it
to go at thoes speeds intermitantly. I thing the hesitation is fule
starvation, but if theres enough pressure to force an intermittant leak why
isn't there enough fule at the floats.
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