Light fighters alternatives, 1935-1945 (1 Viewer)

[don4331]

I am crunching your numbers here. A 3.5 litre engine putting out 650hp at 13,000rpm works out to a BMEP of 1280kPa, or around 185lb/in^2. This is consistent with 87 octane fuel. 13,000rpm is remarkable for an engine on a van. How long is this engine going to last?

The Cosworth-Ford HB V8 was expected to last just over 21 km (3 laps of Spa-Francorchamps which is 7.004 km/lap). 68% of time at full throttle, considerable less at full power as the car was going up through the gears. Out lap at ~80% power, qualifying lap at full beans (~100 seconds) and a cool down lap at ~80% again. After qualifying, the engine was replaced with a de-tuned engine expected to make the ~300 km (less than 2 hours) of the race.

Fuel at the time was limited to 104 octane.

 

[don4331]

Here is 675 hp aviation engine:

ASE-650 SAGA - Aerosport Engineering

That is not an aviation engine: It is a BMW M73 V-12 with low compression (8:1) pistons <and better rods>, a supercharger <for almost 25 psi> and a speed reducer.

Note: BMW will persecute anyone putting their engine in an airplane with the full might of an OEM automotive manufacturer (they did so against the team running BMW V-12s in their Vimy replica before their attempt to replicate Alcock and Brown's flight <resulting in replacing engines with Orenda V-8s>).