In additon to the below paragraph also check the inlet valves / float
valves. Typically , 40DCOE carbs came with a 1.50 valve. There were also
dampened (spring loaded) valves that I found to be restrictive. If you do
find that you have the 1.50 valves then switch to 2.00. That should be
sufficient to keep the bowls full provided you have the volume.
I have found this to be the problem on a few cars that ran perfect until
someone put a number on it.
Regards,
Alan
> If the fuel pressure always stays around the 3.5 psi mark, then you are
> getting enough fuel delivery. if the volume drops off the pressure will
drop
> also. Sounds like there may be another problem. the 40 pump jets are
> probably to large, try 35s or 30 and try a 70 or 80 bleed for the acc pump
> inlet check valve. overall the car setup sounds to rich even at sea level.
> But I don't think that is the loss of power problem .
>
Regards,
>
> GregSolow
> ----- Original Message -----
> From: "Walt Hollowell" <walt@hot-tr6.com>
> To: <fot@autox.team.net>
> Sent: Monday, May 17, 2004 5:40 PM
> Subject: out of fuel- I think?
>
>
> > I could use a little help from some FOT members that drive TR6s with
> triple
> > Webers.
> > In hard street use and SCCA autocross events I have no problems.
However,
> > this past weekend I was club roadracing
> > on our Albuquerque, New Mexico 14 corner 1.65 mile road course. After
the
> > 4th or 5th lap on full throttle the engine started falling flat as if I
> > dropped a couple of cyclinders due to lack of fuel (110 octane racing
> gas).
> > I had to fall back in the pack and not push too hard (not difficult with
> my
> > driving skills) or things would just run flat. I suspect I do not have
the
> > volume of fuel I need for this racing application.
> > My engine is putting 155 hp to the ground (just did a chassis dyno last
> > week) with a few more ponies to be found with some more tuning. We are
> > racing at 5,500 ft. above sea level. I have 10.5:1 compression, ported
> > heads, stiffer valve springs, 286 cam, headers and triple Weber 40 DCOE
> > carbs. My main jets are 200 air and 115 fuel. Emulsion tubes are F7.
Idle
> > jets are 55, acelerator jets are 40 and the bleed off is set at zero. I
am
> > using the cheap electric fuel pump you can get at Pep Boys which has
> > performed OK up till now..If it is the higher volume of the two types
they
> > sell. A fuel pressure gauge shows I am getting between 2.5 and 3 PSI of
> fuel
> > to the carbs. I am not using the stock mechanical TR6 fuel pump at
all.If
> my
> > problem is in fact not enough volume things now get difficult. Do you
> think
> > I can just hook up a second (same type) fuel pump in line to increase
the
> > volume a little or am I going to have to find a high volume, low
pressure
> > fuel pump with a return line back to the gas tank.
> > Has anyone else came across a similar problem?
> > Any suggestions?
> >
> > Thank You
> > Walt Hollowell
> > Albuquerque, New Mexico
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