Electric Turbo 2. ‘Big’ (K27)

Why make a bigger one that will generate too much air, or stall, for the small 1600cc engine from idle to 2800 RPM. The only reason to try was that a bigger compressor wheel will not require that many RPM to generate air pressure. The small RC motors seems limited to 50.000 RPM. With a gearbox it might even work better. Normal gear wheels will not last many minutes but why not try. It was tried with limited success but replaced with a direct motor drive. All with ceramic ball bearings.

A motor 4068 2650KV 6S dia 40 mm L 68 mm 5 mm axle, 22v, 122 amp, 2684W (3.6 HP) 50.000 RPM was used both with gearing and with direct drive to the billet 74.56/45.6 mm, 96g.

The result geared or direct drive was. Approx. 0.3+ Bar air pressure at up to 125amp 19.8volt 2475 W (3.3HP). But too much air for the small 1600cc engine. The compressor will stall. It will much better fit a 3.5 l engine.

With the B36-60-06L 3S 4KV 12v 1300W (1.7HP) shaft 5 mm 11v 100 amp and gearing 1:1.67 It could run 125.000 RPM without load but loaded with the compressor on, I got to max 65.000 RPM and again only approx. 0.3 Bar but a lot of air. The motor was not strong enough. The motor broke and I changed to the 4068 2650KV 22v that can deliver 3.6HP.

It could take the load, but the gearbox did not last very long. I worked much better with direct drive but limited to 50.000 RPM where it only can make 0.3 Bar on that compressor It operated on 20V 93A 1860W (2.5HP).

All this electric turbo stuff ends up with the conclusion that ‘It is not worth it’ for my 1600cc engine. Possible my new build Rover V8 3500 200HP could rise to 260HP though not for now.

As a guy doing everything myself the challenge of making axles running up to 100.000+ RPM made on my Super 7 lathe, making 120+ amp control circuits getting rid of kW of heath. It has been fun and not that waste of time. That’s life.