Yes in theory it would work like that but it doesnt. As I said before I am well aware of how these engine work and what they are capable of and not capable of. I knew everything that you have just posted, but what you have to remeber that not everything works the way they are supposed to. Remember that on paper a bumble bee is not supposed tobe able to fly. But yet it does. A famous explorer once said that pikes peak would never be summited. But now we have races to see who can get to the top. I believe the fastest time is tight around the 10 to 15 minute mark.
But any ways the point is it may make sence on paper but we dont live on paper we live in the real world and they just do not work. They just do not work, there are many of costumers that will agree with me on this.
well i know bout all what you said and how engines work i love cars and know how they work but anyways i think they work. i wont get one because there too much $$$$. and people dont use them because there to powerful for them to race a car with a super chager or turbo on a track. but im sure that people have them and love them they probably racing them on a long street. mike
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quote:
ORIGINAL: axisrc
and people dont use them because there to powerful for them to race a car with a super chager or turbo on a track
Yeah, right. Try added weight, higher genter of gravity, neglible (if any) increase in performance (when compared to buying a better engine or tuned pipe), more things to go wrong, etc etc.
If they were as fantastic as you seem to believe they are then all racers would be using them.
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If you really want a super charger I'll sell you the one that I bought about three months ago and I'll even toss in a boost bottle and a new never been ran Traxxas 2.5 engine. the only thing you will need at this point will be the pull/ EZ Start unit. just P.M. and we can work out the details. (I upgraded to a O.S. 18 CV, now my T-Maxx will do wheel stand for about 90 feet.) this is the way you can find out if the Super Charger will really work. the Super Charger is a RB Innovations model for the Traxxas T-Maxx but it sounds like you should be able to make it work just fine. BUT remember YOU ASKED FOR THIS.
P.S. My thoughts would be get better Radio gear and spend a few week learning to drive before upgrading to bigger better engines. it will be a lot cheaper in the long run.
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i Have a Jato 3.3 with a RB Supercharger, RB 50% overdrive pulley, and an RB auxillary fuel pressure system. MIP boost bottle, Integy open flow air filter, and a Tsais side pipe. i will tell you for a fact that with the right jetting the supercharger makes a huge dif. I had yet to be beat by anything I will race anybody. i have raced "pink slips" and won several trucks.
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Joined: 7/6/2005 From: behind my 'puter, USA Status: offline
I have some information that may help or hurt either side's arguement concerning whether or not to supercharge a nitro engine.
After sleeping on it, I figured out what a nitro engine's timing map would look like (see the illustration below). Naturally, the exhaust port will open sooner and close later than the intake ports on the sleeve. This obviously means that the exhaust has the longest duration of all the sleeve ports (unless the engine block ports are mismatched to the exhaust sleeve port). Also, after spending some time visualizing the crank position and the induction opening in the crank shaft, there may be an overlapping arc in which all of the ports are open. For supercharging, this overlap is where fuel-air will be ejected from the engine unburnt. The same is true for 4cycle engines with large overlap arcs in their cam profiles when they are running at low RPMs.
Overlap is okay and even needed to pull out high RPM horsepower, but does little for low RPMs and idle RPMs. I can see supercharging a nitro engine making some gains in high end RPMs, but supercharging will in this case will not do much for low RPMs (this is from what I deduced while thinkng on it). I can see the mixture becoming leaner than usual which must be compensated for by richening the needle settings. This will of course cause more fuel to be ejected out the exhaust unburnt.
Anyways, on the side of supercharging, each engine brand has a different timing map than another engine of another brand. There may be an engine with a timing profile that eliminates this overlap all together (I don't know, no one has posted any engine timing maps on-line). Supercharging in an engine without this exhaust & induction overlap might yield some benefit (I don't know, again I cannot tell you which engine has what timing profile).
I know air has mass and so does the fuel particles mixed in it. That is why full sized engines have mass flow sensors to help control their timing. In nitro engines, this mass is what requires higher RPM engines to have a larger overlap (to account for the time to accelerate the fuel-air mass through the carb, ports, and into the cmbustion chamber). I can see a low RPM torque monster running a smaller or virtually no overlap since it does not have to worry as much about accelerating fuel-air to very high velocities.
Sorry if I sound technical, and I hope this information helps in better helping everyone makin more informed decisions. If I have said anything wrong, please correct me. I am not a fluids (aeronautical) engineer. Also, as I already said, I do not know the timing profies of any engines. If someone has any of these specs, please let me know or post them. A timing map will help determine which engines can benefit from supercharging and which ones will not.
< Message edited by SAVAGEJIM -- 10/12/2006 1:59:04 AM >
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I second this. But I personally say don't get a turbo or supercharger or even NX (nitrous oxide) kit for your engine. Like I said earlier, it's best to know what the timing profile oof your engine looks like before you do any of these. I looked all over the net and the only timing specs I could find from the manufacturer was that for the OS .18TZ. Of course, I had to plot the timing map to find out the port opening overlaps.
Anyways, if you do find an engine and a forced induction/NX kit that works, please post your success. I am very curious to know if it will work. Mort of all, I want to know what the timing profiles that can benefit from forced induction/NX works.
Thanks for this info. This is what everyone has been saying and actually seeing a cut away of the engine has definitely convinced me that the port opening overlaps are too graet for forced induction. I was thinking that the port overlap openings would occur at arcs of about 15degrees to 30 degrees, but the pics evidently make it look like the port overlaps are much greater (about 45degrees or more). I am now leaning more strongly towards saying "definitely no!" to forced induction for nitro engines.
okay what that article is completely neglecting is the fact that when the sleeve ports are open, the crank port is closed... air does not get pushed right thru, as the supercharger pressure only can charge the crankcase, not the combustion chamber.. there is no way to presurinze the combustion chamber from carb inlet, when the crank window is open the piston is blocking the ports, and when the piston unblocks the ports the crank window is already closed .....
another thing is the person who wrote the article has great skills making a page look pretty, but zero knowledge of how these engines run....these engines are a crank induction, piston valve 2 stroke, also called a piston port engine..... He seems to think that air can just pass right thru if you blow into the carb... LOL... He doesn't even ever mention the engines initial induction is done thru a timed crank port, nor the fact that the piston itself is a plunger that pressurizes the crank case to feed the combustion chamber..... Anyways a perfect case of a NetExpert, armed with all the latest greatest page making skills, but zero knowledge of what he writing about. Anyways dont beleive everyhting you read... That article made me laugh actualy... In his theory the engine would never be able to run..
< Message edited by supertib -- 10/15/2006 1:25:32 AM >
another thing is the person who wrote the article has great skills making a page look pretty, but zero knowledge of how these engines run....these engines are a crank induction, piston valve 2 stroke, also called a piston port engine..... He seems to think that air can just pass right thru if you blow into the carb... LOL... He doesn't even ever mention the engines initial induction is done thru a timed crank port, nor the fact that the piston itself is a plunger that pressurizes the crank case to feed the combustion chamber..... Anyways a perfect case of a NetExpert, armed with all the latest greatest page making skills, but zero knowledge of the tru fundamentals of what he's writing about... Anyways dont beleive everyhting you read...
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finally some of you people will stop insisting superchargers and turbos work, geeze, nitro engines already have a built in supercharger and nitrous system (so to speak) in them
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RE: were to find a turbo or supercharger kit - 
