Walt,
I would not think that pumps in series would be that much of an
improvement, though in parallel might do the job if there was enough line
to flow the volume.
Something that seems to be overlooked is pumping from a fuel cell. You
didn't mention having one, but as you might, most cells have to top
outlets that require the fuel to be lifted out of the cell from a point
much higher than the original tank outlet. It also is missing the head
pressure afforded by the tank bottom outlet. That has to be working
against the system.
Kastner stated that a line returning fuel to the tank causes fuel heating
that robs power. He made that comment when I suggested feeding full flow
and pressure to the carbs and bleeding off excess pressure and volume
after the carbs get their fill, returning the excess to the tank.
Webers typically get lean from fuel starvation on long straights. I don't
think you could do that at Sandia, but getting fuel pickups uncovered is
a possibility.
Just an FYI, talked to the tech guy at Union Oil last year for help
locating product locally. While we were talking he told me that the
octane requirement for a 2.0 litre GT-6,CR of 12:1 would allow for the
dilution of their 110 octane 1:10. I asked several times if that was 1
part race fuel to 10 parts premium unleaded. Small bore diameter has low
octane demands even at high CR. He said running it straight would only
add to his retirement fund.
Drive fast, take chances,
Bill
On Mon, 17 May 2004 18:40:49 -0600 Walt Hollowell <walt@hot-tr6.com>
writes:
> 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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