Look the VW Lupo 1.2 TDI article closer. On the right side of the picture of
two Lupo cars you will find a graphic presentation of torque & horsepower.
The blue lines represent a standard production engine model (61 hp) and the
red lines an "optimized" (tuned/chipped or whatever) 90 hp engine. Left side
of the diagram you find the kW and horsepower figures, at the bottom the rpm
and the right side shows the torque readings.

The higher blue curve shows the hp, the lower shows the torque. Now look
e.g. 2500 rpm (drehzahl 1000 U/min) at the bottom, follow the line straight
up until you reach (cross) the upper blue line, then go horizontally to the
left side and look the hp figure. In this example something like 48 hp.

The highest torque rpm will give you the best fuel economy. That is where
you would like the cruise rpm to be. In case of direct drive arrangement you
get about 55 hp max by using e.g. 3000 rpm engine/prop speed. The tuned
engine version does deliver about 73 hp at the same rpm.

Hopefully this helps you.

JP


"Montblack" kirjoitti
...
Check out the VW 1.2 liter diesel. Max torque 1800-2400 rpm.

Does that mean DIRECT drive is possible? Is that where you want to run the
thing, at max torque?

Does that maybe mean 61 hp can be found around 2400 rpm?

Clueless but curious.

Info on the engine copied below, and can be found in the link. Fun site.

http://www.geocities.com/plane_diesel/index2.html
Scroll down. Next on, under the Mini and Toyota Yaris.

"VW Lupo 1.2-litre and 1.4 three-cylinder engine the first diesel direct
injector to have not only its cylinder head but also its cylinder block in
aluminum. At just 220 lbs

Because of inherent design issues with a three cylinder design, Volkswagen
used a balancer shaft to qwell vibrations and the result is an extremely
smooth engine. Injection is via pumpe duse high-pressure unit injector
elements arranged in the cylinder head and driven by the camshaft. The
higher pressure permits a more efficient burn with improved performance
and economy.

The 1.2l TDI also utilizes a Garrett turbocharger with variable-vane
turbine geometry. The 1.2-liter TDI has an output of 61hp and a maximum
torque of 140 Nm (103 lb-ft) is available between 1,800 and 2,400 rpm."


Montblack