BMW_R1100S_motorcycle_engine_-_installation.pdf

My choice is the BMW R1100S motorcycle engine.

Content:

- General Information

- Fuel system

- Air filter

- Exhaust system

- Heating

- Wiring

- Engine cooling

- Gear

- Experience

General Information

Some details need to be considered in order to gain 72 KW (98 hp) from the BMW

R1100S. Experienced Dutch BMW Cherry flyers (Renny de Leeuw and Bart Kroes) as well as the

official BMW-Engine retailer Wilfried Bleidiesel sent me some very valuable tips for the installation.

Thanks a lot!!!

Renny wrote a very interesting article for an American magazine once -see pdf file- .

I will provide important details and my own experience on this page. First of all some technical data

regarding this installation.

BMW R1100S engine and Hirth G40 gear

Air- (40%) / Oil- (60%) cooled four stroke opposed-twin

engine Cam in head, four valves per cylinder

Type

99 mm x 70,5 mm

Bore x Stroke

Displacement

1085 ccm

Power

72 KW (98 bhp) @ 7500 min -1

Max. Torque

97 Nm (70 lb-ft) @ 5750 min -1

Compression Ratio

11.3 : 1

Electronic fuel-injection, electronic ignition, digital engine

management, Bosch Motronic MA 2,4

(since 12/2002 dual ignition system)

Fuel System

& Engine Management

Fuel Consumption

approx. 11 litres (3 Gal) per Hour (@ 75 %)

Gear Reduction

2.96 : 1 Hirth G40

Weight

ca. 80 Kg (176 lb) -ready incl. gear, oil ...

All major advantages of the BMW Engine are obvious:

- No carburetor-icing (Electronic fuel injection)

- No mixture-regulation

- Premium Unleaded (95 ROZ)

- Extremely low fuel consumption

- Very high power-/weight-ratio

- 3 - way catalytic converter (closed loop) can be used

- Significantly less expensive than a certified engine

...

I bought a pre owned BMW R1100S on ebay and kept the engine as well as all parts I need for the

Cherry (Fuel-pump,

Oil-cooler, Harness...). I sold all remaining parts (Frame, wheels, gear...) online. Finally the BMW

engine was less than $ 1000. And an additional $ 2000 for the gear including rotational oscillation

dampener and automatic centrifugal clutch (the propeller starts turning @ 2700 min -1 - there will be no

harmful low rpm vibration to the plane at all-).

In order to reach maximum performance I am committed to keep all original technical details from the

BMW motorcycle.

Overview:

Assembling of the Engine compartment

Fuel system

First of all I kept the fuel-system (Pump, filter and strainer) from the motorcycle. This unit is mounted

on a flange

and located inside the fuel-tank (just as on the BMW R1100S).

The fuel manifold is taken from the motorcycle as well. This way the pressure valve is located

close to the fuel injection valves in order to avoid pressure losses.

Fuel lines

Air Filter

Renny and Bart emphasized the importance of the air-filter-housing volume and the design of the

exhaust system

in order to reach a good engine performance.

I compared the air filter housing of the motorcycle and a purchased model for planes.

BMW R1100S air-filter-housing 7 liters Purchased model 4.5 liters

Measuring 11 Liters, I built the ultimate size (10 times the engine displacement).

I did not calculate the volume, but measure it by water displacement.

Air-filter-housing with original BMW filter

Another BMW-detail are the inlet ducts. They are shaped like a trumped with a decreasing diameter

towards

the throttle-valve. It fits perfectly to the throttle valve allowing a smooth air flow.

Filter Housing with original BMW inlet ducts (black)

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: