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But would the engine also only be 1/64th the capacity so the ratio of blower volume to capacity would be the same for full size as it would for the model?I suppose there are also two types of model, the scale one that mimics the original supercharger and looks right, this will run for display and not be put to work so does not really matter what effect the supercharger has. Then there is the performance model engine that is likely to have a non scale looking supercharger that does increase performance but would look out of scale if upped to full size. I see some of the 1/5th scale off road models are now sticking blowers onto their engines. I think the power increse speaks for itself[youtube1]https://www.youtube.com/watch?v=3bi5h7Tf2BY[/youtube1]
Hmm, that Bentley is quite some piece of work, but will that scale blower work AS a blower on a scale engine. My point about the reduced volume was in connection with the fact that you can't scale nature. The air and fuel molecules are not reduced by scale and so are likely, maybe (I don't KNOW) to be affected differently by the supercharging. The thing on the 1/5th engine is designed (with no pretense to scale appearance or size) to suit that engine and clearly does so very well, but then it's not a scale engine is it? It's a glorified weed whacker basis with tune up goodies. It's a full sized engine in its own right. Very different from a scale V8 running a scale blower.Martin
I'd love to say I understood all that, Lohring, but alas, it's beyond me. I have never understood the finnessing of 2 strokes. I'm just in awe of any hydroplane driver who, with his nose a few inches off the water can operate the adjustable tuned pipe length with one foot and the adjustable trim of the engine with the other. The torque difference of lengthening and shortening the pipe out of a bend and on a straight is noticeable.Thanks for taking the trouble to explain the principles.Cheers,Martin
The R/C flying community have supercharged engines like the YS140 FZ. This type of engine pumps mixture into the cylinder using crankcase compression, similar to a 2 stroke engine. The performance gains are modest.
The Ricardo company has a reprint available at a reasonable price. It's one of the most worthwhile books on the development of internal combustion engines.http://estore.ricardo.com/shop/the-high-speed-internal-combustion-engine/Lohring Miller
Some info many may not know. For every lb. of boost 7% more HP is generated. The intake stroke also pushes on the crank with this added pressure verses drawing in the air. With the added push from the pistons on the intake stroke the forced induction engines produce more torque and rev up a lot quicker. I know I had a 4-71 blower on a stock 350 SBC. Man would that mild engine come to life with the blower on it.Just thought I'd pass this info along.
That's £5.95p saved that I can spend on something else - more tools!
I love the male logic to spending money Jo