----- Original Message -----
From: "Earl Kagna" <kags@shaw.ca>
To: "Kurt Leslie" <kansl@net1plus.com>
Sent: Saturday, July 02, 2005 1:56 PM
Subject: Re: tricarbs
Kurt:
SU carbs are designed to operate with a fuel pressure below 3# - the float
needles will start to lift off their seats above that, and not necessarily
all together, depending on the slight differences from carb to carb in float
level settings.
As long as you fuel pump is not delivering excess pressure, your problem
lies elsewhere. These carbs tend to get a bit 'floody' when at hot idle in
traffic on a hot day just from heat soak. Possibly your heat shield
insulation is not right - the tri-carb has insulation on both sides of the
shield. Are the insulator blocks (the book calls them distance pieces) and
all gaskets in place at the carb mountings?
You don't indicate which float system you have - the HS4's in the tri-carbs
used brass floats early on, and nylon floats in the later cars, and the
float bowl lid was a different part on each. If you have a mismatch of
float bowl parts, you could have problems there.
SU carbs by nature tend to be touchy on dirt in the fuel - even small bits
can cause flooding. The HS4 carb used on the tri-carb has no fuel filtering
system at all, other than the 'sort of sediment bowl design' at the bottom
of the float bowls. Are you using an inline fuel filter somewhere in the
fuel line? I have found that doing so will eliminate 90% (or more) of float
bowl flooding problems.
Let us know how it turns out.
Earl Kagna
Victoria, B.C.
BT7 tri-carb
BJ8
----- Original Message -----
From: "Kurt Leslie" <kansl@net1plus.com>
To: <healeys@autox.team.net>
Sent: Saturday, July 02, 2005 3:11 AM
Subject: tricarbs
I have been having trouble with float overflow. Carbs were all re-built
and functioned fine for several months. Vehicle sat for about a month,
when re-started float overflow on rear carbs. Disassembled rear float
chambers, cleaned and reduced float drop level, carbs functioned fine in
garage with car up to op. temp. went for a ride and one of rear floats
started to overflow again. Walked away some what irritated and left car
for about a week, re started and no leaks. I have not had a chance to
take a drive yet. A idea why on the road driving might cause the bowls
to overflow? Are they that sensitive that a little bumping around will
cause a problem, or is there something I am missing. Replaced everything
but the floats as they appeared not to leak, and have never found
evidence of fuel in the floats. Pump has also been rebuilt, is pump
pressure a issue Kurt
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