Don't forget that a two stroke will pump almost double the air that a
four stroke engine will of the same declared displacement. Also in
that size range for the displacement, the turbo will be quite small.
 No where near transport trucks or industrial equipment size and
weight. The center section is one area of mass but the other is the
turbine housing. If it was cast from titanium or made of Inconel
sheet the turbine housing would be much lighter and reducing an 8
pound turbo by 2-3 pounds.

Dale Davies

How about this:

http://www.ebay.de/itm/401036119269?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Lutz Strobel

A two stroke rotary will not pump double the air compared to a 4
stroke rotary the only difference is the air/fuel mixture will pass
thru the bearings also since there is not a oiling system, all the
oil is in the fuel.

David Jr.

A four stroke looses volume pumped as it requires one revolution for
the compression and power strokes thus 1/2 displacement per
revolution. Then minus volumetric efficiency. The two stroke fires
every revolution and pumps air each revolution. The engine should
pump double the air that a four stroke does but the volumetric
efficiency is generally lower than four stroke engines so the air
pumped more like 3/4 with two revolutions as a four stroke firing
all cylinders one time.

Dale Davies

Four stroke piston engines. A 4 stroke rotary does in one revolution
 what takes a 4 stroke piston engine to do in 2 revolutions.

That is another reason why it generates so much power for it's size.

Paul Lamar


A 4 stroke rotary is the same as a 2 stroke rotary are the same
revolutions. The difference being one all oil being mixed in the
fuel, the 4 stroke have a oil system to oil the bearings with minute
amounts of oil injected into the intake to keep the apex seals
lubricated.

I am thinking of trying the old Gator Super Charger I have been
reading about. The site is long gone and the books can not be found
but they took larger turbo charger shells and compressor rotor,
mounted on bearings and beltdrive to make

a inexpensive turbo charger.

Since the small rotary engine I am going to experiment on are old
snowmobile 2stroke it would be a pull thru system so the
turbo/supercharger will get lubed and the engine too.

The smallest turbocharger I could find at a decent price are for 2
or 4 small ATV/Motorcylce 100hp, 13psi boost. I am afraid the small
rotary engines will not produce enough exhaust gas flow to spin them
up to do any good.

I am only looking for 2 to 10 psi boost so I will do some more
research on the Gator Super Charger and see how that goes. Also with
the super charger there will be no lag/spin up time either.


David Jr.


Perhaps Mazadtrix could provide some expertise on turbos?

Gene Kahn


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