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Turbocharged, Supercharged, and Hotrod Motorcycles: Re: [turbobike] problemsolving

Re: [turbobike] problemsolving

christer johansson (christer.johansson@mbox383.swipnet.se)
Thu, 20 Aug 1998 18:11:37 +0200

    Yes I´m using a Bosch electric fuel pump (colour code green)
that pumps fuel to an Malpassi , adjustable fuel pressure regulator
wich senses boost (a hose from the pressure pipe routed to the regulator)
and the regulator is set slightly above atmospheric pressure (adjustings by
an screw on the regulator) Since the fuel pump, pumps large amounts of
fuel to the regulator , there is a return hose to the fuel tank from the
wich returns all excess fuel . So the regulator makes sure there´s always
same fuel pressure in the bowls.

Christer J

Robert Miles skrev:

> I'm just curious..
> What makes your float bowls refill while on boost?  Do you use a fuel
> pump calibrated for more fuel pressure than boost?  If so, do you have
> trouble with fuel pressure "blowing" open the float valves and
> overfilling your bowls?  Thanks.
> Rob Miles
> >Hi Glenn and all others!
> >
> >On My bike I have pressurized the carbs at 2 places, both lines
> >starts at the tubing between the intercooler and plenumchamber.
> >First the pressure to the fuelbowls , it starts with a fitting that is
> >angled about 45 degrees to the tubing and sticks in about 2 inches
> >into the tubing facing against incoming air (boost) thus creating a
> >dynamic pressure , a little more than the boost
> >This also makes it possible to run much smaller main jets , I=B4m
> >using 162,5 main jets and it now produces 300hp (ok 2pistons
> >collapsed so I better go up 1size). The line have an
> >inner diameter of about 4mm (1/6 inch) and of course connected
> >to the fuel bowl vent holes by an T connection.
> >Now to the second pressure line , it is about an 1/2 inch inner
> diameter
> >
> >and is angled 90 degrees to the tubing and do not stick into it
> >(static pressure). this line is connected to the carbs by an T
> >connection
> >between the carb pair. The purpose of this is to put pressure
> underneath
> >
> >the membranes to help lift the throttles, cause when you go on boost
> >the pressure drop past the throttles isn=B4t enough to create
> sufficient
> >wacum to lift the throttles.
> >This system works absolutly perfect!
> >What do You think? Please let Me know how it goes!
> >By the way I=B4m building a new version of My motor, aiming for an easy
> >350hp and a enormus powerband (torqe).
> >Hope You can understand what I have written.
> >see ya Glenn
> >                      /Christer J
> >
> >
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