07/01/2003

The WIBU System

Marine Diesel Handbook by Louis R. Ford, M.A  editor Motorship Magazine 1944
Diesel Publications, Inc.  Standard Maritime Engineering Manual

Page 356  Dynamic Supercharging

"In the Wibu system of supercharging, the mass inertia of the air columns in
individual cylinder suction pipes is utilized for the filling the cylinders
with air.  The operation is as follows:

In the first portion of the suction stroke, through approximately half the
stroke, the intake valves are held only partially open by means of special
cams.  As the piston moves down, a partial vacuum of approximately 4.5 pounds
is created in the cylinder.  At about midway of the suction stroke the intake
valve is fully opened, suddenly causing a high-velocity intake air columns,
which results in the creation of a super-atmosheric pressure in the cylinder
due to the interia of the air in the suction pipe.  Adaption of such a system
requires only minor changes to an engine, is low in first cost and
installation cost, and may be used in conjunction with other supercharging
systems.  When applying this method jointly with the buchi system, benefits of
each method are realized;  the dense air discharged from the turbo-blower to
the Wibu type suction pipe increases the kinetic energy of the air column,
thereby accentuating the "ram" effect and increasing the degree of
supercharging and efficiency of the turbo-blower"

Ya think he may have read some oldy diesel dude stuff?

-------------------------

Diesel Engineering Handbook.  Deluxe Edition.  L.H. Morrison 1936

Chapter 28 Supercharging.

"Inlet Valve Setting. - Of all the Type F Systems of supercharging, the
"Wibu" design, developed by the Polish Engineers Wicinski and Bujak,
seems to offer certain possibilities.

The operation of the Wibu system is as follows:  In the first portion of
the suction stroke, the suction valve is slightly opened, and as a
result a partial vacuum of about .3 atms is created. At about the middle
of the suction stroke the suction valve is fully opened, and the vacuum
causes a high air velocity up to 650 ft per second.

Under these conditions the air column in the suction pipe shows a much
greater increase in kinetic energy than with a resonant oscillation of
type E"

Basically, a large vacuum is built, and then the valve snapped open.
The kinetic air charge is significantly greater than a resonant system
can offer.

Note that this system is designed for a wot diesel engine.  At light
loads, this means that the pumping losses may be increased.

Also, it should be noted that this system works extremely well when
combined with a kinetic ram system.

When you can't use an external compressor - rethinking may result in
nice increases.