Axial Blower 2
One may. by no means assume, that air-cooling stands in the way of a high performance yield. The Porsche company has been proving this for decades. In the end, air-cooled engines have been known to produce
over 1000 Hp.
The first figure above, shows the rear-mounted engine of a Porsche 911, which although it has been tuned, has an axial blower which corresponds to the standard component. One can see how, with just a slight
increase in the RPMs, a large amount of air is taken in and distributed from above to the cylinder-banks. This is a completely different cool-air guidance than is found in the radial blower
of the VW-Beetle, from which the Porsche once originated.
The second figure above, shows the distinctly different cool-air guidance of the Carrera four-cylinder racing engine. In this case, the air is drawn in through a horizontal blower. This construction is even more compact.
If here, the regulation through a fan belt and an angle drive was complicated, figure 3 above, shows the solution achieved after numerous development stages. What can be seen is the crank mechanism of one of the
most successful racing cars of all time, the Porsche 917. It is called a 12-cylinder boxer-engine, is however, actually a V-engine.
What is important here, is
the central power-drive, which does not strain the crankshaft as strongly. It is from here that the torque is sent to the clutch and gearbox. It is very important here that a gigantic fan-wheel can be mounted, which takes in
and directs enough cool-air from above, onto the cylinders. It couldn't be any simpler. In this case however, a thermostatic regulation would be difficult, in this racing engine it was probably not considered essential.