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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Conversions >> RE: turbocharged 25cc homelite whipper snipper
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RE: turbocharged 25cc homelite whipper snipper - 8/30/2005 5:38 PM   
tim_n


 

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ORIGINAL: Willdo
Guess it would stop the venturi effect working,


Would U like me 2 explain the venturi effect to U or some thing?
The more volume of air going through the carbie from the turbo on HIGH revs would only increase more fuel flow. Ether flooding the motor or creating more combustion.

With idle the turbo spins very little, there 4 very little pressure if at all on the fuel line.

So I don’t get where Ur coming from.

NOW HEAR THIS!!!!!!!!!!!!!!!
P.s. ppl read the (RCU Policies) before opening Ur mouths.
I won’t reply 2 ppl that cant say anything other than complete negativity.
when did this all have 2 turn in2 a debate. the motor works Excellent.
what do I have 2 prove
stop Or I will be forced 2 leave this forum. OK
I am only trying 2 give ppl ideas on making new things.

Don’t get me wrong constructive criticism is good


Willdo Would U like me 2 drive my Subaaaaaaaaaaaru over there?
With a blow up DOLLY 4 U. Then I will finely C U happy.

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RE: turbocharged 25cc homelite whipper snipper - 8/31/2005 12:19 AM   
Willdo


 

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RE: turbocharged 25cc homelite whipper snipper - 8/31/2005 12:33 AM   
Rupurt



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Status: offline 		Hey Willdo looks like rugby isn't popular in the states . I recieved my planes for the Wren turbo-prop today, looks like it will be a cool project, 7+ hp from a 1,8kg engine. Fuel comsumption is about 190ml/min. What a beast

Tim, chill dude the more wound up you get, the more of a target you will become.

< Message edited by Rupurt -- 8/31/2005 12:36 AM >

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RE: turbocharged 25cc homelite whipper snipper - 8/31/2005 9:34 AM   
Willdo


 

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Status: offline 		Sounds good to me Rupurt, I'm very interested. I've sent a PM. - don't want to encroach on Tim's thread.

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RE: turbocharged 25cc homelite whipper snipper - 8/31/2005 9:48 AM   
Brentus101


 

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Status: offline 		Thanks heaps Tim much appreciated. No rush because I know how much it'd suck to have to do. Ciao. Thanks again.

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RE: turbocharged 25cc homelite whipper snipper - 8/31/2005 12:29 PM   
Crusty



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Status: offline 		tim, I suggest you do some reading on the work of bernoulli, it will help you understand venturis
I can see you are on the defensive, but open up to advice given and make truthfull comments on your endevours and I am sure you will get a much better response

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RE: turbocharged 25cc homelite whipper snipper - 9/1/2005 3:58 AM   
project5k


 

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Status: offline 		does any one have any links to a pro made turbo setup for these little engines, i would like to study up on them a little more
all of this has peaked my interests, and im thinking of making a turbo myself, i understand the basics, but im a little rusty on all of the specifics.

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RE: turbocharged 25cc homelite whipper snipper - 9/1/2005 10:46 AM   
Crusty



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Status: offline 		5k, there are'nt any, because they dont work.
I saw a unit intended for model cars being sold a year or two back, but of course it didnt work, the rc car guys tried to convince themselves it made power but it was all in the mind

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RE: turbocharged 25cc homelite whipper snipper - 9/1/2005 3:59 PM   
OLD_SLOW and in the WAY



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RE: turbocharged 25cc homelite whipper snipper - 9/1/2005 7:07 PM   
av8tor1977



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Status: offline 		Well, this thread is a little silly in all the goings on and I hesitate to get into it but...

Two stroke supercharging could work. It might not turn out to be feasible, but it definitely could work. Back when Hitler commanded Ferdinand Porsche to build the "Peoples car", (the Volkswagen), he was working on a four cylinder two stroke engine that had two cylinders supercharging the other two. He never got to finish developing it because Hitler was pressuring him to get the car on the road. You won't see much more two stroke development from the big concerns now because of fuel efficiency and smog problems today. I believe there are two stroke turbocharged diesel engines made, but I don't feel like researching it right now.

Anyway, just my dos centavos...

AV8TOR

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RE: turbocharged 25cc homelite whipper snipper - 9/1/2005 7:27 PM   
Crusty



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Status: offline 		Yes detroit Diesel with valves, designed specifically to use forced induction............nothing like our purely piston ported rc engines

edit......I am not saying I believe you cant make a turbocharged two-stroke, I am sure there are many marine examples, but I am saying adding one to an otherwise normal piston ported 2-stroke like the ones being discussed here is not going to give worthwhile gains, even if properly engineered

edit two... Sorry Now I am getting ridiculous, I'm just re - stating my position over and over which is adding nothing to this discussion so I'll not bother this thread again.
Good luck Tim

< Message edited by Crusty -- 9/1/2005 7:45 PM >

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RE: turbocharged 25cc homelite whipper snipper - 9/2/2005 12:20 AM   
Rupurt



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Status: offline 		Crusty is that an opinion or is that experience. If a change in altitude can change performance I believe a turbo could have the same effect. I am confident you are wrong.

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 9:58 AM   
Dave_Gherardini


 

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Status: offline 		"Crusty is that an opinion or is that experience. If a change in altitude can change performance I believe a turbo could have the same effect. I am confident you are wrong. "

Well how high do you plan on flying your model?

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 10:07 AM   
Dave_Gherardini


 

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May the forced be with you

So anyway, Have you blowed one up yet? Youll never know how better it is until you go beyond its intended duty cycle. How about some nitrious. It would be a compliment to your turbo. Keep up the good work.

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 10:58 AM   
Crusty



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quote:

ORIGINAL: Rupurt

Crusty is that an opinion or is that experience. If a change in altitude can change performance I believe a turbo could have the same effect. I am confident you are wrong.


ffs, there is a huge body of evidence to back up my wrong theory, what you got to back yours up Rupert?, apart from some guy who soldered up a turbo and says it gives double power...get real

edit...oh and please try and understand (it seems to be escaping some people here) the thread is about turbo-charging a conventional piston ported two stroke
and as for the snide little dig, no its not from experiance its from lots of reading and understanding...I also know that the moon has a dark-side...also not from experiance

< Message edited by Crusty -- 9/5/2005 11:08 AM >

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 11:25 AM   
Rupurt



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Status: offline 		It wasn't a snide dig sorry if it came across that way, I am just curious as to why you say it wont work. I have also not had experience turbo charging a piston ported two stroke but have done a lot of reading and understanding, and from what I understand it can be made to work.

"what you got to back yours up" what huge body of evidence?

There is a huge amount of evidence that shows a two stroke engine runs better at higher pressure. It doesn't help anyone just saying it won't work, tell us why.

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 11:30 AM   
Rupurt



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Status: offline 		Dave I was referring to people who flight at higher altitude. With the lower pressure they get lower performance. There a couple of guys on this forum who fly at altitude and they will tell you everything is less efficient higher up.

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 11:50 AM   
Brentus101


 

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Status: offline 		Every body get over it, this forum has turned into an arguement. It's pathetic.

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 12:05 PM   
Crusty



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Status: offline 		Rupurt, I know you are intelligent and have a lot of knowledge, , im sure you know, the main drawback is port overlap, you just blow all the charge out the exhaust. this has already been discussed .
your analogy to pressure change with altitude is not the same as pressurising the intake only, when altitude changes pressure it also correspondingly changes pressure at the exhaust end, so no difference as far as the engine works, just a change in charge density.When you pressurise just the intake but not the exhaust the engine then behaves differently

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 12:20 PM   
Rupurt



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Status: offline 		I thought that would be the reason, but remember the turbine will increase the exhaust pressure, it is possible some extra restriction in the exhaust may be necessary to stop the charge disappearing out the exhaust. I think the main issue here is of practicality(Why bother?), I would like to see tim get it going just for the hell of it.


"this forum has turned into an arguement" it is a matter of opinion, I see it as a heated disscution

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 1:17 PM   
Crusty



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edit..mods gonna get me now...oops

< Message edited by Crusty -- 9/5/2005 1:18 PM >

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 8:09 PM   
av8tor1977



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Status: offline 		Real life info...

The only thing a normally aspirated engine has to fill the engine with the air/fuel mixture is atmospheric pressure. (What is a vacuum? Lack of atmospheric pressure.) Atmospheric pressure reduces at approximately 1" of mercury per 1000' increase in altitude. This reduces the "filling" ability of the engine due to the reduction in available pressure, and causes about a 3% per thousand foot altitude decrease in engine output. This can be VERY effectively combatted with turbocharging. With turbocharging, air is pressure fed to the engine and the engine does not have to rely on strictly atmospheric pressure. The last turbocharged airplane I flew could maintain sea level full rated horsepower up to 12,000 feet altitude, and what a HUGE difference that made in it's performance.

For a little more info on performance reduction with altitude, read the article I wrote for the August 1992 issue of RCM magazine.

As for turbocharging two strokes, as I've said it can be done but may not be feasible for us modelers.

AV8TOR

< Message edited by av8tor1977 -- 9/5/2005 8:13 PM >

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 8:32 PM   
Rupurt



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Status: offline 		You trying to tell me this isn't real life The 3% per 1000 feet is surely only the first few thousand The air pressure drops quicker the higher you go doesn't it. Anyway nice to have some numbers to think about.

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RE: turbocharged 25cc homelite whipper snipper - 9/5/2005 10:28 PM   
av8tor1977



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Status: offline 		Actually it's a little more complicated than simply stated, because it's "Density Altitude" we are talking about when computing engine performance. Density altitude is altitude corrected for varying local atmospheric pressure and temperature. Too much to go into here, but at a 5000' altitude field at a temperature of 85 degrees, the engine "thinks" it is at over 8000 feet of altitude, and behaves accordingly. Note that humidity also makes things worse; it displaces the air.

Just imagine you are at a field altitude with the above conditions, getting ready to take off in a Cessna 150 that has an effective service ceiling of 12,500 feet. The airplane "thinks" it is nearly there, sitting on the ground! This problem has killed a good number of pilots that didn't receive proper training about it. Turbo charging is just great in these conditions as the power is restored to sea level ratings, and your performance is not so seriously hampered.

At 18,000 feet true altitude, over half of the atmosphere is below you. (Just a little trivia.)

Here's a handy website with a density altitude calculator to play with: http://www.wahiduddin.net/calc/calc_da.htm

AV8TOR

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RE: turbocharged 25cc homelite whipper snipper - 9/7/2005 7:20 PM   
tkg


 

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Status: offline 		Tim
Try a look at www.steamengine.com.au
Lots of bits to think about

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