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na or forced air induction

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bigboystoysguy

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:winnar: hey guys i have a rbi supercharger and everyone I've talked to has put theres up for sale or just didnt like it!! so whats up is it realy not that great or what?:beer:
 
if it is a supercharger it should work great. then ut takes the power from the crankshaft to turn a turbine to compress air into the carb to make som kickass revs, so if iit works like it says, it should at least boost power by 35%
 
The one I had on my sirio 1.8 only kicked in at midrange. It always had air leaks. It is a turbo not a supercharger. It has your typical turbo lag. You have to turn the fuel mixture way up so it doesn't lean out when the turo kicks in. So when it isnt on the truck runs super rich and sluggish
 
its not a turbo its a super turbos use exaust to spool it up supers are belt driven like what i have.mine kicks in at like 1/6 thottle.but the low end seems realy good no bogging yet but i went though and got rid of air leaks.:banana:
 
traxxas tmaxx

heej guys can i set a supercharcher on my tmaxx
 

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prabbably you can. what kind of engine do u have. and it is a supercharger, and if it has no air leaks, and it is a supercharger, it will add power as soon as the crankshaft starts spiining.
 
tmaxx

heejs i have a hpi 21bb motorblok /and a picco 21 blok

greats mustafa
 
Not quite certain what you guys are getting after here, and I am kind of glad that you understand what each other is saying. I will say this: This thread has certainly pushed the bounds of comprehension on many counts.

Good luck to each of you in your quest for superchargers and forced air induction systems. When you are done wasting your time trying to soup up a $150, 2 stroke, 1.5HP engine...perhaps you can make some claim to fame in the drag racing world.
 
Originally posted by SkyMaxx
Not quite certain what you guys are getting after here, and I am kind of glad that you understand what each other is saying. I will say this: This thread has certainly pushed the bounds of comprehension on many counts.

Good luck to each of you in your quest for superchargers and forced air induction systems. When you are done wasting your time trying to soup up a $150, 2 stroke, 1.5HP engine...perhaps you can make some claim to fame in the drag racing world.
Click to expand...

LMFAO SKy, I was starting to think the same thing bro.

While 1:1 engines and Nitro glow engines have very fundamental simalarities, they are still apples and oranges in many ways. Boost applications whether it be Nitrous, SuperCharger or Turbo, on a Standard combustion engine can be awesome but I sure as hell don't want it on my Nitro engine. Any boost application is going to shorten engine life to some extent on a 1:1 engine depending on how and how much your running. From what I've seen with SUpercharges on Nitro engines, the "cons" don't outweigh the "pros" bye a long shot...lol. Your not slighty decreasing engine life (specifically piston and sleeve) but your SUBSTANTIALLY decreasing it. Not to mention that proper tuning can be a nightmare. How much increased power are you getting with a Supercharger to justify the matinence cost and especially @ high alltitudes?? Not enough is all I'm saying. You'd be MUCH better off with upgrading to a bigger engine or having said engine properly modified for sick NA power.

Sorry if I sound like I'm ranting but IMHO SuperChargers are purely for mundane show looks (lol) and uneducated kids with to much money to burn. No dis to anyone that's running or has run one but most experienced nitro peeps woulda agree with me on this. Do yourselves a favor and research mean ass Nitro power plant upgrades before you think about wasting your money on a supercharger. Nitro engines in general can be VERY expensive but running a supercharger on one would make it UBER expensive..

As for the Nitrous kit...lmao. When I first saw the thread some months ago I could tell that it was very much in the R&D stages. I could think of a plehtora of reasons why you wouldn't want to run Nitrous on a Glow engine..lol. According to a recent RC mag review the Nitrous kit avaliable is basically crap. Maybe if you where looking to set a NItro world record.

Peace
 
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Originally posted by SkyMaxx
When you are done wasting your time trying to soup up a $150, 2 stroke, 1.5HP engine...perhaps you can make some claim to fame in the drag racing world.
Click to expand...

While I agree to this in some extent, it makes me wonder why you try to hop up your engines? I'm not talking about superchargers or turbos (I personally think they're a waste of money in RC) but about getting a high performance pipe. I'm sure you've bought a better pipe for one of your engines. Aren't you trying to do the same thing... supe up your engine to make it perform better?

In my personal opinion don't waste your money of the supercharger and definately not the nitrous. Save your cash and put it down on a better engine and a quality tuned pipe. You'll have a lot less to go wrong, less weight, and an overall better performing ride.
 
I'm with both of you. I have read several articles on the reasons not to super charge or turbo a nitro engine. Here's what I gather, maybe somone can tell me if I got this right.

From what I hear, and have read (not that I know much), a supercharger, or a turbo try to do the same thing. Compress the air before it goes into the cylinder(more air in same space). This means with more air in the same place, you can add fuel. More fuel, and more air in one space means a bigger explosion in the cylinder. The bigger explosion means more power.

Here's the problems with a true Turbo/supercharger setup on a nitro rig.

#1 the exhaust port on a nitro engine is open during the intake stroke. When you try to stuff more air in, instead of compressing the fuel air mixture, it all blows out the exhaust before it explodes. (on a regular car the valves are closed so compression can take place). THe intake actually closes before the exhaust port. So anything compressed IS going to be blown out the exhaust during an after the intake port closes. There's no way to compress air if you don't have a semi-air tight place to compress it

#2 There is really no way to add fuel on the fly without a very complicated computer, or some mechanical contraption that is throttle activated. If you dont add fuel when the turbo/supercharger is spooled up (at least 1/4 throttle), then there will be more air in the cyclinder, hence a lean condition. Lean for nitros spells heat, and lack of lubrication.

#3 To add fuel without a high dollar contraption, you will have to run the engine very rich. This will be fine for mid to high throttle when your super/turbo charger spools up and is feeding air, BUT when you are trying to get off idle power and are low in the RPM range, you will be to rich for adequate power.

#4 The drag weight/rotating mass. The nitro motor is going to have to physically spin up the supercharger. This adds to the rotating mass you need to get moving in order to get to a good rpm range, its going to killl your low end. To run it right, you're already going to have to be running rich as all hell. Rich + added weight = even worse accel.

#5 Turbo restriction. To setup a turbo you're going to need to gt past all of the problems above cept' #4. What you are going to have to get past with a turbo is the exhaust restriction. Exhaust is a really big deal for nitro rigs. Restricting the exhaust is just plain and sim0ple not a good idea. How long does it take for your nitro to die when you plug the exhaust? They also use the exhaust on smaller engines as a type of throttle, the more you restrict the exhaust, the slower it runs.

So, there you have it. I may have it off a little, but i think the concept is there. For the little bit of performance you are gaining, you are losing that much in exhaust drag, and spool up inertia.

Not only that, if you have your low end power, your running dangerously lean in the mid to upper end. If you are not runing lean, your accell is going to take it in the rear.

I'm thinking if you have the old T-maxx with .15, for the 169.99 hey are chargin' you could pick your self up a hell of a motor. Not just a .15 but you could go with a xtm .18 or any other high performance motor. You are better off with a bigger displacment motor than you are a supercharged little one. You will have more torque.

If your looking for power with the same motor you have, you can port it yourself, or send it off to be ported for less than the supercharger.

If you are loking for serious "I Spent a lot of money on my maxx bling", and lots of "super shiny, one of a kind " the supercharger is for you.

If you're looking for real world performance I just don;t think is going to be there.


BTW I see the draw, supercharged, and turbo motors for 1/1 cars add a lot of power, with minimal modifcations. Lots bolt right on, they are expensive but don't always require internal mods, and the power addition is sometimes unbelivable.

This is just what I gathered from rstudying about forced induction on 2 stroker nitros, please correct me if I am wrong, and feel free to add anything I missed. I'm afterall a nitro
:n00bie:
 
I totally agree with ya Gil and I think that's what I was alluding to in my long disertation...lol. I don't think Skymaxx was thinking in terms to the contrary.

Edit - I would definitely consider boost on an Aircraft engine, 19llbs of boost on your Plane engine would be nice.hehe.. Nice post Lykan, I'd elaborate but I'm mentally spent.

Peace
 
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YS Futaba makes supercharged 4 stroke engines. They use a dual throat carb and the crank case as the air pump. They're phenominal in the power and torque categories, but are aircraft only engines. The other limitation is a 10K RPM limitation on all 4 strokes (valve float problem).

Lykan, good post.
 
For those that may have misread or misinterpretted my reply post, let me clarify. Add sarcasm to my original reply.

If that does not make it clear, then read on.

I think that applying anything that makes a 1:1 work more efficiently can be applied to a nitro engine within reason (fuel filter, air filter, good port job, port matching headers, shims, etc.). I think anyone who wants to apply a supercharger, nitrous kit or other forced air induction is stepping into another universe.

These little two strokers are designed to burn fuel efficiently. Add a good tuned pipe and proper gearing and you can milk them for all the performance you need. Adding a supercharger or some other device is both a waste of time and money. They might add something in the bling factor, but the stupidity factor way outweighs that.

In short, I think this thread is a total load of crap. I would never waste my time or money trying to apply something of this sort to any of my RC engines.

Does that set things straight? Hope so.
 
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