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turbocharged 25cc homelite whipper snipper

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Old 08-14-2005, 09:59 PM
  #51  
airbr
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Default RE: turbocharged 25cc homelite whipper snipper

make sense. I would have never thought of it, but being 2 stroke with no valve to seal off compression I guess it should work at high rpms.
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Old 08-19-2005, 02:53 AM
  #52  
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Default RE: turbocharged 25cc homelite whipper snipper

Usually you would take the material from the side opposite 2 the spark plug. Then it should take more exhaust out the cylinder and cool the motor. Also taking the metal from closer to the spark plug side will most likely decrease compression and make Ur engine run rough.

Then there 4 U do the complete opposite 4 the intake. Allowing more air and fuel 2 come in.

Also what I did was widen the chambers on the cylinder to allow more fuel in.

5mm is a small price but pays off in the long run.
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Old 08-19-2005, 03:01 AM
  #53  
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Default RE: turbocharged 25cc homelite whipper snipper

There QuickTime .Mov format.
Biggest is 3.6mb
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Old 08-19-2005, 03:25 AM
  #54  
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Default RE: turbocharged 25cc homelite whipper snipper

Yeah umm
My resonator thingy is really called an expansion chamber but I just call it a resonator. Cause it makes it sound like a WRX when I put it on. I agree that they help 2 strokes run a lot smoother and gain power. I based my design off the pic. They originated from 2 stroke motorbikes and you also can tune them by cutting the end pipe called a “stinger”. It changes the power band. I oped 2 make it short so I have all top end revs.

“2 strokes have 2 have some back pressure” I agree with that. [sm=thumbup.gif]
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Old 08-24-2005, 06:50 AM
  #55  
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Default RE: turbocharged 25cc homelite whipper snipper

Hey I am curious as to how to put the turbo together and what you used exactly to make it. Can you please e-mail a detailed instruction on how to assemble and make one? I attepted on but failed miserably hahaha please e-mail some plans it would be much appreciated. shorti102@hotmail.com
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Old 08-25-2005, 03:27 AM
  #56  
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Default RE: turbocharged 25cc homelite whipper snipper

Sorry Tim, I didn't notice your question in post #38.

I could have sent you a PM instead, but maybe AERO NUT and others should see this too.

My expertise in turbines is very limited ( almost zilch), but I have been a fitter/ turner/ engineer/whatever, for more years than I want to remember, ( with plenty of qualifications, but qualifications aren't really that important) what is important is understanding the forces, temperatures involved, knowing how to weld and machine things properly, and trying to understand what two stroke porting etc. is all about. - it's actually quite a science, and involves calculations, not just a bit off here and another bit off there!
Still, a turbo on a two stroke! - food for thought.

I was a little harsh before I edited my earlier post, (but it was really directed at AERO NUT who made some unnecessary remarks about those who criticised you). However, he did say "we" - I suppose he was including himself.

Successful inventions don't come from "spurts of wild thinking", - they are more likely to come from "educated guesses" and some "lateral thinking" - plus the odd hunch!.
Many of those people who criticsed your efforts have a wealth of knowledge gained from experience, which is often sneered at or ignored, and are written off as "silly old farts". Maybe you are one too AERO NUT, - I don't really know how old you are.

TIM, I admire your enthusiasm, but please read the book which Rupurt? recommended to you, and as I said , go to night classes and learn to weld and machine properly, there is a heap of info out there already available, if you would just look for it and listen to it, and then maybe you can do "Down Under" proud. - Good Luck!
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Old 08-25-2005, 06:03 AM
  #57  
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Default RE: turbocharged 25cc homelite whipper snipper

Hey guys lets help Tim out. I think hes doing just fine. he is willing to try stuff and all he is asking for is help so plz dont get on him so much. hes undertaking a project more complex than a simple conversion that Im doing, and I am still asking a bunch of questions.
Im not a motor head like the rest of you guys but Im reading the threads and learning. So help us and not critcize us
Thx Lureman Keep working at it Tim!!!!!!!
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Old 08-25-2005, 02:47 PM
  #58  
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Default RE: turbocharged 25cc homelite whipper snipper

Better read what I was saying properly.
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Old 08-27-2005, 12:54 AM
  #59  
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Default RE: turbocharged 25cc homelite whipper snipper

ive often wondered if a person could put a turbo on a weedy engine... but wouldnt the carb have to be on the intake of the turbo? i know on a car, if your gonna use a carb you have to totally enclose the carb to equalize the pressures on the intakes and bowls or have the turbo draw the air fuel mix from the carb and then into the intake... if you just put pressure on the intake of the carb wouldnt it just try and blow the fuel back down the lines into the tank?
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Old 08-27-2005, 03:30 AM
  #60  
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Default RE: turbocharged 25cc homelite whipper snipper

It doesnt work.......thats as plain and obvious as I can make it
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Old 08-27-2005, 04:51 AM
  #61  
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Default RE: turbocharged 25cc homelite whipper snipper

What doesn't work?
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Old 08-27-2005, 05:56 AM
  #62  
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Default RE: turbocharged 25cc homelite whipper snipper

Guess it would stop the venturi effect working, - ( if it was a float carby), - but this is a pumper carby!
Let's wait and find out!
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Old 08-27-2005, 06:20 AM
  #63  
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Default RE: turbocharged 25cc homelite whipper snipper

Are you being funny?, this whole thread is ridiculous, I'm all for experimentation, I take note of previous experimenters work,...you know the people who spent thousands of hours working on engineering principles, I dont just throw all that away, BECAUSE SOMEBODY MAKES CLAIMS OF DOUBLING POWER OUTPUT ON AN ENGINE THAT THEY DONT EVEN UNDERSTAND THE WORKING PRINCIPLES OF
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Old 08-27-2005, 07:02 AM
  #64  
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Default RE: turbocharged 25cc homelite whipper snipper

i have personally seen a video of this whipper snipper and it does sound as if the mods have increased the rpm's. You do not need any instruments to tell if there is more power, you can do it by ear.
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Old 08-27-2005, 07:39 AM
  #65  
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Default RE: turbocharged 25cc homelite whipper snipper

Project 5 k is correct. Carb works on principle of vacuum in venturi to draw fuel. Pressurising the carb creats no vacuum. The same reason carbs on dragsters are on top of the blower and aircraft engines with centrifugal and turbo chargers have the carb on the inlet side of the blower.
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Old 08-27-2005, 10:22 AM
  #66  
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Default RE: turbocharged 25cc homelite whipper snipper

You can run a carb before or after a turbo and there are problems with both setups. The venturi will still work, there is still air flow only its at a higher pressure, the trouble comes in when the fuel pump cannot deliver the fuel to the float chamber under operating pressure, A problem that may occur with the walbro carbs is the ambient pressure helps control the diaphragm that controls fuel flow. As far as I can work out the difference between the pressure inside the carb barrel and ambient is what controls the needle valve. If the pressure in the carb is higher than the pressure outside the valve will close and no fuel will be allowed in. This is just my theory and it may be wrong.

Whats ridiculous about trying to help the guy build a worthwhile turbo by offering advise and knowledge.
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Old 08-27-2005, 11:36 AM
  #67  
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Default RE: turbocharged 25cc homelite whipper snipper

Rupurt:
You just explained why a bowl type carb and diaphram carb won't work properly between the blower and the motor. Only one that will work properly is fuel injection.
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Old 08-27-2005, 11:54 AM
  #68  
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Default RE: turbocharged 25cc homelite whipper snipper

Flypaper, fuel injection is definitely the best way to go. Here's a problem with putting the carb before the turbo. When the manifold pressure is low the needle opens and allows more fuel into the carb, If the the engine was running at full throttle and the carb set to idle the compressor would take time to spool down creating a large vacuum in the manifold which would allow fuel to flow freely into the carb and most likely flood the engine.

Like I said there are problems any way you decide to go but it can and has been done both ways. They even have names Blow-through and Draw-through
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Old 08-27-2005, 12:09 PM
  #69  
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Default RE: turbocharged 25cc homelite whipper snipper

Once the butterfly is closed in the carb, no fuel,air can flow through it, unless the manifold pressure is high enough to suck the butterfly out of the carb Just pulling your chain
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Old 08-27-2005, 12:19 PM
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Default RE: turbocharged 25cc homelite whipper snipper

"unless the manifold pressure is high enough to suck the butterfly out of the carb " you mean low enough. So who's gonna buy one of those os 160 fuel injected engines to build a turbo for?
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Old 08-27-2005, 05:08 PM
  #71  
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Default RE: turbocharged 25cc homelite whipper snipper

We're getting into a wild debate about layout and why this won't work and that won't work, but to me the priority is the construction of the thing!

How many revs do these turbos operate at? I would hesitate to use even a properly welded up turbine let alone a ( badly ) soldered one!

Rupurt, this guy has made the effort for sure, and all to his credit, but it's a bit much to expect a person to be able to go through life without sometimes being told that he is going the wrong way about it, - that isn't reality! and I reckon, being an Aussie he'll be tough enough overcome any criticism, try even harder and keep going.

Sorry I'm not a "sensitive new age guy"


Don't know what Tim thinks, - he hasn't answered, but Im sure he'll prevail - keep going mate.
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Old 08-28-2005, 02:23 AM
  #72  
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Default RE: turbocharged 25cc homelite whipper snipper

Willdo in post 30 I said I didn't believe the one in the pictures was any good, just moved on from that.
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Old 08-28-2005, 03:21 AM
  #73  
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Default RE: turbocharged 25cc homelite whipper snipper

Thanks Rupurt,
I did feel that you'd see the funny side of things, quite frankly I'm more interested in engines than rugby but I do enjoy the big matches sometimes.

I have always wondered what would happen if a two stroke was fitted with a turbocharger, and with a bit of rethinking the layout, redesigning it, doing a proper job with the fabrication and machining, using the right materials, etc. and as Crusty says, using data from those who have gone before, Tim will then be able to tell us with some authority!
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Old 08-28-2005, 04:38 AM
  #74  
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Default RE: turbocharged 25cc homelite whipper snipper

I wouldnt bet on it
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Old 08-28-2005, 04:57 AM
  #75  
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Default RE: turbocharged 25cc homelite whipper snipper

Where is Afghanistan?
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