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RE: [Deleted] - 9/14/2005 1:12 AM   
Hobbsy



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Guys, we need to keep this RC related, Please

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RE: turbocharged 25cc homelite whipper snipper - 10/17/2006 10:37 AM   
Crusty



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Status: offline 		So?...still waiting

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RE: [Deleted] - 10/18/2006 3:35 AM   
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Status: offline 		Guys, You need to start looking outside of the rc world

YES TURBO CHARGERS DO WORK ON 2 STROKES AND IT IS PROVEN.

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RE: [Deleted] - 10/18/2006 3:54 AM   
jaceP


 

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In the snowmobile industry they have been turbocharging 2 stroke engines for over the past 10 years. They give you more of a power increase in 2 strokes then they do in 4. CPI racing is currently producing a kit for a 800 skidoo that running 12psi makes 270hp. Stock is 150hp. My buddy is throwing one on his sled now.

In quads they have had turbos for the past 5 years. a 350 banshee with the turbo can make about 180hp. They produce more power then the 700cc N.A. motors.

At the last quad race that I was at there was a single cylinder 525cc two stroke turboed honda that made 180hp and yes he ran the numbers to back it up. He ran a faster mph than our dyno proven 170 hp banshee.

heres your 101 on the turbos. You have to have the correct port timing and pipe. The exh. pressure in the expansion chamber(pipe) is greater than the intake preasure (generally about 1.5 times) keeping your intake charge inside of the motor.

People have been playing with superchargers by using an varying exhaust valve trying to close off the exhaust when the tranfers are opening, keeping your charge inside the motor. I don't know how that is performing. They are still in the proto stage.

if you want credabilty you can look at packardracing.com to see who we are and to know that I am not just making this up.

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RE: [Deleted] - 10/18/2006 5:32 AM   
tkg


 

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Status: offline 		Went to the site, saw some wicked quads, but not one turbo. Lots of expansion chambers though.
Got some picture else where of the turboded 2c

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RE: [Deleted] - 10/18/2006 5:48 AM   
andrew66



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Status: offline 		i just came across this thread, and have to say something.
As far as turboing a regular trimmer engine, it CAN be done! will it be as efficent as a 4 stroke or a 2stroke thats been modified for the turbo, NO. but it will up the power on the trimmer. when the intake and exhaust ports are both open, this creates the good ol' scavenging effect which is common in all internal combustion engines. the pressure from the intake charge will "force" the exhaust gas out of the cylinder and fill it full of nice clean unburned fuel and air (much more that would be possible if normally aspirated) which in turn gives you more power. but, that might not always be noticed in all applications, because there are trade offs and disadvantages to some mods. ex: if low end torque is needed, or crisp throttle response. (all turbo'd engines have some degree of lag), but for all out balls to the wall top end power, you dont need throttle response or low end torque. (in most of these applications)
as for R/C use, i think this guy may be on to something. although his first product may be bulky and inefficient, he can always use the findings (the plusses and the drawbacks) to better his invention which could lead to a very successful product. im sure that the first few models of most any invention were like this at one point in time, but u gotta start somewhere! and he may also learn/discover something else beneficial along the way. (alot of inventions have started out as "mistakes" or undesired results.)
Im only 21 and i can see this.....cant you guys?

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RE: [Deleted] - 10/18/2006 10:01 AM   
tkg


 

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Status: offline 		If your interested that "nothing new is under the sun" check out prewar DKW motorcycles. They build a parallel twin with 4 pistions in a twingle configuration and a 5th pistion acting as a pumping supercharger. Not to bad for 1938

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RE: [Deleted] - 10/18/2006 11:40 AM   
av8tor1977



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Status: offline 		I once read that Ferdinand Porche's first choice of engine for the Volkswagen was a four cylinder two stroke engine that had two of the cylinders supercharging the other two. He couldn't get the bugs worked out in time as Hitler was in a hurry for the "People's Car"; Volkswagen, so he built the Volkswagen four stroke engine as we know it today.

AV8TOR

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RE: [Deleted] - 10/18/2006 5:58 PM   
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Status: offline 		there are some enormous diesel 2 stroke ship engines that are supercharged but i doubt you could fit it on a plane

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RE: [Deleted] - 11/17/2006 12:47 PM   
redneckUSCG


 

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Status: offline 		i just stumbled upon this tread.... i am a mk on a 378'coast guard cutter, we have a pair of morris fairbanks opposing twin 2-stroke diesel engines, they are a true 2-stroke with no valves just intake and exhaust ports just like our little 2-stoke nitro engines. the big diesels run both a roots type supercharger and twin turbo chargers, at 900 rpm they are making aprox 6000 hp at 27psi scavange pressure, that is pressure surounding the pistion ports. so to the theory about the weedwacker engine with a turbo, if you could overcome the fuel ingection problem it would very well work with some port timing mods and induction mods......

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RE: [Deleted] - 11/17/2006 2:21 PM   
hardtop351


 

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Status: offline 		ive just been reading here about this little turbo thingy.....nice idea but i hafta agree with all those who think a scattershield/bomb shelter/ bulletproof vest is a great idea. if it even gets any REAL speed it WILL explode and take anything in its path with it.

however in saying this yes he is young and willing to try an idea in his head....think he better be careful or he wont be using it to think with if and when it explodes. most turbocharger turbine wheels are capable of taking enormous heat (up to 1000 degrees celsius) and pressure( up to around 50 psi) and they can reach speeds exceeding 120 000rpm...yes i said 120 000prm this is NOT a typo. can you imagine this getting loose at those speeds?????. i shudder to imagine. it will take your arm or leg off as neat as you like and just keep going.

to the little guy with the big ideas and big dreams.....keep tinkering and thinking....but PLEASE be careful of what you do and PLEASE consider what might happen if something goes wrong.

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RE: turbocharged 25cc homelite whipper snipper - 12/1/2006 3:04 PM   
tim_n


 

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Status: offline 		hey every1 im back after a year.
As i found a lot of criticism basically saying that I didn’t know what I was talking about with any turbo. I decided to let this topic cool down abit.
Ok ive done what some of U have said, ive bought a turbo 4cyl car had abit of a tinker with it. built the motor up from factory at 98Kw to 285Kw. Runs stock 5psi through the turbo. Now runs 14psi. all on standard 95 octane. So obviously I know what im doing. Bear in mind all done at home. The only thing I had to get worked on was some bigger wheels on the turbo put on and the intake and exhaust needed to be bigger.

Now back to the whipper snipper
Ive also been playing around with a bit of nitrous, injecting it through the carbie. Ive needed to alter the fuel ratio adding more oil to stop the piston from melting. Revs out harder and really quick now.

Back to the turbo
“I” still think the turbo has made a power difference. I had a talk to a turbo-tuning place and they said that the only down side of the motor is the 2-stroke cycle but because of the way I ported the whipper snipper it was getting through. They also said that the turbo can only improve the power because your forcing compressed air into the cylinder.

All I was saying to people last year was have an open mind to this topic.
also im not really worried about exploding things its all part of the fun. Im sure the person that created gunpowder lost a few eyebrows

I might be on to something


< Message edited by tim_n -- 12/1/2006 3:10 PM >

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RE: turbocharged 25cc homelite whipper snipper - 12/1/2006 3:53 PM   
Crusty



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Status: offline 		Tinkering is great..,but BS is BS...I can smell BS from 100 yards

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RE: turbocharged 25cc homelite whipper snipper - 10/26/2007 11:04 AM   
turbo man


 

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Status: offline 		hey

u r all idiots ofcouse u can turbo a 2 stroke wat do u think a rottory it is a two stroke and they turbo them i think u should do ur research be for u start aguing about it



< Message edited by turbo man -- 10/26/2007 11:06 AM >

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RE: turbocharged 25cc homelite whipper snipper - 10/26/2007 12:54 PM   
Ralphbf



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Status: offline 		Actually it wasn't eye brows.
He and his brother worked together.
First his brother lost a few fingers then his life.

Are you the same guy who claimed to have made a turbo out of soup cans?

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RE: [Deleted] - 10/27/2007 6:27 AM   
tkg


 

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Status: offline 		Just a simple question . How you going to lube a turbo turning 90 gillizion RPM

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RE: turbocharged 25cc homelite whipper snipper - 2/2/2008 1:26 PM   
miserygut


 

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Status: offline 		please guys can u help me out

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RE: turbocharged 25cc homelite whipper snipper - 2/2/2008 1:29 PM   
miserygut


 

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Status: offline 		please guys can u help me out i got a old whipper snipper, i clean the carby out and attach new fuel line and even clean the ignition module, suddenly i ass peteol and gear oil then prime it then it doesnt work, i start it so many times but doesnt evev ignite, IM EXHAUSTED

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RE: turbocharged 25cc homelite whipper snipper - 2/2/2008 1:33 PM   
miserygut


 

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Status: offline 		why does my whipper snipper doesnt work , i clkean out the carby and igntiton module but still doesnt work, is it becuz i prme it too much

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RE: turbocharged 25cc homelite whipper snipper - 2/2/2008 1:41 PM   
miserygut


 

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Status: offline 		please help me i got a whipper snipper i clean out the carby and the ignition module and addd new fuel and gear oil and prime it many times and trying to start it, but it neva starts please SomeONE TELL ME!!!!!! is it becus the carby is wreck

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RE: turbocharged 25cc homelite whipper snipper - 2/2/2008 2:56 PM   
Flypaper 2



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Status: offline 		If you put the plug on top of the motor, do you see a spark.?? You will have to do it in the shade to see it. If you take the plug out and it's soaking wet, it's probably flooded. Does it have good compression.??

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RE: turbocharged 25cc homelite whipper snipper - 7/4/2008 10:11 PM   
Yurkiw


 

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Status: offline 		I've been reading this stuff for about a week now. I am inspired by the turbo two stroke, whether it works or not, im making up my mind as I read and think...and read. I am in the middle of a rc boat using two weed wacker motors, and since seeing the turbo thing, im thinking i could too do something to increase the power. obviously, I'm not going to do something that will hurt the power, so i'm trying to figure this thing out. Its also my first real exp. with 2 strokes.
I loved the two rooms question, my thoughts are this: the power will be the same, as you will get more o2, but not increased density, so your power should go up slightly due to the increased intake pressure, but the increased room pressure will resist the exit of the exhaust.
I also think it IS possible to pressurize the cylinder when the exhaust port is open. Basically just force more are in than can get out... (technically speaking).
I should add this is my first ever post, but I would like to keep hearing this stuff, if there is a "new thread" on this, what does that mean, and where would I go to keep reading.


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