RE: turbocharged 25cc homelite whipper snipper

RE: turbocharged 25cc homelite whipper snipper
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RE: turbocharged 25cc homelite whipper snipper - 9/9/2005 9:19:18 AM

tim_n

Posts: 24
Joined: 7/29/2005
From: adelaide, AUSTRALIA
Status: offline

Men/women put it this way “exhaust is waste” and if U can use it to better the engine performance then it is not a waste of time.

Also I know there is always disadvantages of turboz and porting. I have built this motor to what “I” want. I am going to put it on an RC car and I want all top end speed cause I don’t want wheel spin everywhere I go.

just do a port and polish 4 ur self.

might be surprised.

(in reply to Crusty)

Post #: 101

RE: turbocharged 25cc homelite whipper snipper - 9/9/2005 9:41:35 AM

Brentus101

Posts: 4
Joined: 8/24/2005
From: Brisbane, AUSTRALIA
Status: offline

yeah mail okay?

(in reply to tim_n)

Post #: 102

RE: turbocharged 25cc homelite whipper snipper - 9/9/2005 1:41:50 PM

carlosponti

Posts: 1083
Joined: 5/14/2003
From: Moore, OK, USA
Status: offline

quote:

ORIGINAL: tim_n

Men/women put it this way “exhaust is waste” and if U can use it to better the engine performance then it is not a waste of time.

Also I know there is always disadvantages of turboz and porting. I have built this motor to what “I” want. I am going to put it on an RC car and I want all top end speed cause I don’t want wheel spin everywhere I go.

just do a port and polish 4 ur self. might be surprised.

simma down now!

if its what you want to do dont let a bunch of net nerds tell you any different just do your own thing and post a video of it. experimenting can be a fun hobby. though i think your soldier/welding skills needs some tune ups as well

(in reply to tim_n)

Post #: 103

RE: turbocharged 25cc homelite whipper snipper - 9/12/2005 2:43:18 PM

wesg77

Posts: 4
Joined: 9/8/2005
From: , GERMANY
Status: offline

i think this is cool i built a drag racer ( long rail top fueller type )with a 50cc chainsaw engine and go kart wheels on back it whas a bit nuts off the line real quick but i want to put a crank driven super charger on there or nos (ha ha ) my year 8 metal shop teacher just laughed at me and said not in his class a few years ago now , i wish i still had it i am inspired

< Message edited by wesg77 -- 9/12/2005 2:49:01 PM >

(in reply to tripp3d)

Post #: 104

RE: turbocharged 25cc homelite whipper snipper - 9/12/2005 2:51:30 PM

wesg77

Posts: 4
Joined: 9/8/2005
From: , GERMANY
Status: offline

quote:

ORIGINAL: tripp3d

whats a whipper snipper?

otherwise known as a weedwhacker, strimmer, trimmer , or cat snapper, big pole, engine on the top end, rotating spool of nylon line on the other

< Message edited by wesg77 -- 9/12/2005 3:17:42 PM >

(in reply to tripp3d)

Post #: 105

RE: turbocharged 25cc homelite whipper snipper - 9/12/2005 3:32:21 PM

4 stroken ron

Posts: 1414
Joined: 12/6/2001
From: Grinnell , IA, USA
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quote:

ORIGINAL: wesg77

i think this is cool i built a drag racer ( long rail top fueller type )with a 50cc chainsaw engine and go kart wheels on back it whas a bit nuts off the line real quick but i want to put a crank driven super charger on there

Yes, a crankshaft driven "SUPER CHARGER" could be made to work on a 2 CYCLE engine. An exhaust driven "TURBO CHARGER" will not get you any gain in performance. In fact it would probably decrease performance. Now, on a 4 CYCLE engine a properly engineered Turbo, and, or a super charger can get you a signifient performance increase.
Ron

(in reply to wesg77)

Post #: 106

RE: turbocharged 25cc homelite whipper snipper - 9/12/2005 4:01:12 PM

Crusty

Posts: 356
Joined: 11/9/2004
From: Metropolis , ARUBA
Status: offline

Ron, just how does a crank driven supercharger negate the problems that hamper the use of a turbocharger on a piston ported two-stroke?

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Post #: 107

RE: turbocharged 25cc homelite whipper snipper - 9/12/2005 4:21:44 PM

4 stroken ron

Posts: 1414
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From: Grinnell , IA, USA
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quote:

ORIGINAL: Crusty

Ron, just how does a crank driven supercharger negate the problems that hamper the use of a turbocharger on a piston ported two-stroke?

NO, NO, now you are tring to spin (no pun intended) this thing, A better idea is for you to prove to us that your turbo charger DOES work.

Ron

< Message edited by 4 stroken ron -- 9/12/2005 4:22:28 PM >

(in reply to Crusty)

Post #: 108

RE: turbocharged 25cc homelite whipper snipper - 9/12/2005 4:40:34 PM

av8tor1977

Posts: 2769
Joined: 5/3/2003
From: ASH FORK, AZ, USA
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Well, excuse me but I have the same question. How would a supercharger be any better than a turbocharger on a two stroke engine? The problem of the blowdown period, and losing the charge out the exhaust would still exist. Besides, a supercharger takes power to run it!

AV8TOR

< Message edited by av8tor1977 -- 9/12/2005 4:42:42 PM >

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Post #: 109

RE: turbocharged 25cc homelite whipper snipper - 9/12/2005 4:51:35 PM

Crusty

Posts: 356
Joined: 11/9/2004
From: Metropolis , ARUBA
Status: offline

Ron...you better read the thread, Its not me that made the turbo...question still stands

< Message edited by Crusty -- 9/12/2005 4:52:36 PM >

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Post #: 110

RE: turbocharged 25cc homelite whipper snipper - 9/13/2005 9:51:03 AM

Willdo

Posts: 500
Joined: 7/31/2003
From: Auckland, NEW ZEALAND
Status: offline

quote:

ORIGINAL: av8tor1977

Well, excuse me but I have the same question. How would a supercharger be any better than a turbocharger on a two stroke engine? The problem of the blowdown period, and losing the charge out the exhaust would still exist. Besides, a supercharger takes power to run it!

AV8TOR

Surely with a conventionally aspirated two stroke the blowdown problem is the same, - after all the transfer phase is essentially force charging the cylinder - isn't it?
A turbocharger also takes power to run it, - you don't get anything for nothing!
In a fourstroke with a turbocharger, although some of the exhaust pressure is caused by the residual gas pressure in the cylinder when the valve opens, power is used too when the exaust gases are also pushed out by the piston during the exhaust stroke.
In a two stroke, the pressure in the exhaust is again caused by the residual gas pressure in the cylinder as the exhaust port opens, helped by the pressurised fresh charge ( needing power to produce) from the crankcase via the transfer ports.

If a mechanically driven supercharger is used, naturally, power would have to be used to drive it.

If a turbocharger is being used, then some of the power to drive the turbine would come from the residual pressure in the cylinder, plus the pressure of the fresh charge (supercharge - needing power to produce) pushing the exhaust gases out.
So power will be used in one form or another, but what is important is the amount of gain you get from using some of the power. ( this is all beginning to sound like perpetual motion)
All very interesting, - maybe my ideas are a little simplistic and if you think that I'm incorrect, feel free to correct me, but make it stick!

RON,
When you said " properly engineered turbo", you sure hit the nail on the head!

CRUSTY,
Don't blame you for not wanting to take any responsibility for the construction of the original!

One thing is for sure, that machine didn't turn at anywhere near the revs it would be expected to, otherwise there would be schrapnel flying everywhere!

(in reply to av8tor1977)

Post #: 111

RE: turbocharged 25cc homelite whipper snipper - 9/13/2005 3:35:28 PM

Crusty

Posts: 356
Joined: 11/9/2004
From: Metropolis , ARUBA
Status: offline

Ok,.... one last time for you, willdo......the problem is you cant really pressurise a cylinder when the exhaust port is open at the same time you are trying to pressurise it...get it?

I dont know how many more ways there are of explaining this...ive tried a few in this thread, but its not sinking in

< Message edited by Crusty -- 9/13/2005 3:37:46 PM >

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Post #: 112

RE: turbocharged 25cc homelite whipper snipper - 9/13/2005 8:31:03 PM

Willdo

Posts: 500
Joined: 7/31/2003
From: Auckland, NEW ZEALAND
Status: offline

CRUSTY, -Take it easy , - I'm not claiming to be an expert, just hoping someone will point out my fundamental mistakes ( which you are doing admirably, - and not only mine).

BTW, as I think more about it, there would be another problem, and that is, the crankcase being pressurised while the piston is at TDC and the leakage past the piston skirt to the exhaust port.

Hope that you'll relent a little, CRUSTY, and allow that observation, also allow my saying that the construction technique of the thing needs "a tuneup" (as CARLOS said as well). There you go, - please say I get some things right!

CARLOS
Long may the thread live, so everyone can contribute their thoughts, crazy or otherwise, just so long as they're prepared to be corrected, and if it makes people laugh, then so be it.

PS. Has Tim bowed out?

< Message edited by Willdo -- 9/13/2005 8:33:46 PM >

(in reply to Crusty)

Post #: 113

RE: turbocharged 25cc homelite whipper snipper - 9/13/2005 8:55:10 PM

Crusty

Posts: 356
Joined: 11/9/2004
From: Metropolis , ARUBA
Status: offline

Willdo sry, I am very grumpy old man in this thread

......Tonight I will try and find some stuff that suggests the opposite of what I believe...just to try and shut myself up

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Post #: 114

RE: turbocharged 25cc homelite whipper snipper - 9/13/2005 9:04:06 PM

Rupurt

Posts: 694
Joined: 4/9/2004
From: Cape TownN/A, SOUTH AFRICA
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Crusty if the exhaust is under pressure the charge wont go out the exhaust port. How many times do I need to point this out before anyone takes notice?

Say you have a sealed room and the air inside was at 150kpa and another with the pressure at 100kpa, each one had an identical 2stroke piston ported engine in it which one do you think would produce more power?

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Post #: 115

RE: turbocharged 25cc homelite whipper snipper - 9/13/2005 9:10:33 PM