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

[turbobike] problemsolving

christer johansson (christer.johansson@mbox383.swipnet.se)
Wed, 19 Aug 1998 22:13:22 +0200

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 , Im
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
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 isnt 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 Im 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