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Old 02-10-2020, 04:36 PM
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Default Chain-driven Turbocharger?

Came across this and thought it was interesting. Just keep in mind on normal 5+ liter(5000 cc) v8 engines it needs to spin 50,000 rpm just to get 9psi. These 212cc engines are only .212 Liters

The sprocket i counted to have 12 teeth (about 1.5 inch) and it may possibly need a jackshaft to increase the gearing on the supercharger itself to provide boost.

Supercharger gearing aside, oiling would be necessary and placing a secondary carburetor in front of the compressor inlet would be needed for draw-through for when the boost kicks on. And fuel pump.
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Old 02-10-2020, 04:51 PM
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Yeah, but those huge superchargers are so ridiculously humongous that it probably wouldn't want to rev up, plus you'd have to underdrive it a lot.
And by then, with all the extra weight, complexity, and cost, I'd much rather have a quick revving, powerful naturally aspirated engine.

Or you could just put an AMR300 roots type(I know Sid will pop in and harp on me that it's not technically a supercharger, but whatever) supercharger on it, for maybe ~$250-$300 total, and thrash it!
Plus AMR300s are made for ~300cc engines, so even at a 1:1 drive ratio, they can develop a considerable amount of boost.
Plus, AMR300s are filled with oil, so that's a HUGE plus for these splash lube engines.

Why not just have a draw through setup from the get-go? Why only a secondary set up for draw through? A fuel pump might not even be needed.
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Old 02-11-2020, 01:45 PM
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Wonder if chain driving it would technically make it a centrifugal supercharger then. You would have to severally under drive it to get it going that fast.
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Old 02-11-2020, 04:38 PM
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Originally Posted by Kartorbust View Post
Wonder if chain driving it would technically make it a centrifugal supercharger then. You would have to severally under drive it to get it going that fast.
Yes, a centrifugal supercharger.

Turbos and centrifugal supercharger compressors spin on the order of 100,000+ rpm. You ain't getting that out of a chain and sprockets. Centrifugal superchargers are internally geared to achieve that.

You could spin it slower, but it won't build any pressure. At 10k rpm, you might be equivalent to a hair dryer.
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