Superchargers

[Waste Land]

Now this topic is realy weird. I know newbies post up stuff about them all the time like we havent seen them 10000000 times. I'm actually wanting some dicussion abou them. I meant he concept maked sense that it would work.2 cycls have I/E open same timne though. So if u had a side exhaust th eSC would have greater effect due to air flor right? If this did work, you could make greater power with better engine life. You could increase air flow to make alot of power and also turn ur carb up to put motor fuel/lube on ur engine, actually making it run as fast or faster then you were while keeping you engine really cool. This seems very interesting to me. Does anyone ahve experience with one....

 

[olds97_lss]

I've read allot about them just because i was interested like you. Since rc nitro engines depend on a specific air/fuel ratio and don't have the ability to advance or decrease your engines timing on the fly, a supercharger seems to be a waste of time and effort. It in effect makes your engine run to lean all the time. Which in turn gives you more power, but shorter engine life. You can do the same by leaning out your needles. Either way you get more power and short life. But turning the needles is a lot cheaper.

JMO.

Again, this isn't from experience, just from what i've read at other forums/threads concerning the subject.

 

[Kuma]

A supercharger will most likely work on a 4-stroke engine, and if there was one for a 4-stroke engine and you had it in your T-Maxx it'd flip it on its lids constantly due to the increased power torque.

Yes I think superchargers for RC 2-strokes are a waste, I was once interested then rethought the theory.

 

[Error401]

You are correct on the supercharged 4 stroke Kuma. YS/Futaba makes the only supercharged 4 strokes on the model market. These engines are phenominal powerplants, bat are for airplanes. They use the crank case as the air pump and essentially put twice the fuel/air mix in the chamber as a normal 4 stroke.

As a point of reference, I used to fly a plane with one of their .91AC engines on it. A normal .91 4 stroke normally turns a 12x10 prop (diameter x blade pitch) at 10K rpm. My .91AC turned a 13.5x12.5 prop at 10K.

It'd be cool if YS made a 4 stroke car engine, but they don't.

 

[Robie6]

Error 401 is right about that. I to got interested not only in what they do or don't do but look kewl!!. One I saw was 165.00 about 3 months ago & I haven't seen 1 on the market or reviwed since. One thing I know is a suppercharger has to have a pressure regulator or some kind pop-off or the head will blow off. Besides if you read up on the timing of a 2-stroke & tuned pipe combination you'll find out your 2-stroke is "already" supercharged using a "pressure timeline"

 

[Error401]

Originally posted by Robie6
Error 401 is right about that. I to got interested not only in what they do or don't do but look kewl!!. One I saw was 165.00 about 3 months ago & I haven't seen 1 on the market or reviwed since. One thing I know is a suppercharger has to have a pressure regulator or some kind pop-off or the head will blow off. Besides if you read up on the timing of a 2-stroke & tuned pipe combination you'll find out your 2-stroke is "already" supercharged using a "pressure timeline"

Yup, the YS engines are flown mostly by pattern pilots and are kind of exotic for the average fun flyer. The AC's I have need alot of maintenance. Valve gap adjustments, keeping all the gaskets sealed and the bolts tight, etc. Another cool thing about the YS engines is the true timed and pressurized fuel system. Doesn't use exhaust pressure, it uses some of the crankcase pressure and a 1 way valve on the P line, with a valve timed off the crank for fuel injection. I'm sure that one of the .53's or the new .60 size ones can be adapted to a car, but a pull start is out of the question (due to the carb being on the backplate and can't be moved). Starting it would have to be by starter box or some other means like that. That would be sweet on a Savage.

 

[Robie6]

yea, a blown 2-stroke putting out about 5 BHP. I'd love to see that but I don't think there's a drivetrain out there that could handle it. My warmed over XTM 24.7 puts out just about 3 BHP & I'm watching things. My .26 just had its first run-up on the bench after opening up the induction duration from 175 to 185 degrees & polishing & flowing the crank & some port work. Fired up first hit & sounds awsume. Temp never went over 180 after running for 10-min & it took that long to reach 180 without using a fan. can't wait till that guy goes back in.