RE: Considering a large Glow engine ??? For big engines, GAS is better in every way :)  
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RE: Considering a large Glow engine ??? For big eng... - 10/3/2006 8:45:31 PM   
Hobbsy



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From: Colonial Beach, VA, USA
Status: offline 		I had a three year old Ryobi 26cc fourstroke weed wacker and it was piece of junk from day one, I gave it to my neighbor and got a Stihl. I don't have to wear my arm out to start the Stihl, starts on the first pull every time.

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RE: Considering a large Glow engine ??? For big eng... - 10/3/2006 9:07:18 PM   
JettPilot



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quote:

ORIGINAL: DarZeelon

JettPilot,


No, I am not!

Please see both of these pages, to which we were referred:

http://www.rcshowcase.com/html/RCS/rcs50vt.html

http://www.rcshowcase.com/html/RCS/rcs400.html

And also to post #52 by Dave.


I don't think I misunderstood any of them. Do you?

Those that don't are not aerobatic capable due to lubrication constraints.



Your posted links have NOTHING to do with a Honda 32 CC four stroke will run inverted or not. You claim this as "proof", but they are unrelated engines.

You are either to dishonest to admit you were wrong about this, or you are just to bright Which is it ?????

JettPilot

< Message edited by JettPilot -- 10/3/2006 9:09:40 PM >

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RE: Considering a large Glow engine ??? For big eng... - 10/3/2006 9:11:53 PM   
Sport_Pilot



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From: Acworth, GA, USA
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quote:

ORIGINAL: asmund

are you guys going to fly or mowe the lawn



Unfortunately I mow the lawn more than I fly.

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RE: Considering a large Glow engine ??? For big en... - 10/3/2006 9:13:07 PM   
RVM


 

Posts: 1975
Joined: 3/12/2006
From: Sacramento, CA, USA
Status: offline 		4-stroke glowies have gobs of torque compared to 2-stroke glowies. That's another advantage besides transition. Also, in glow engines, the (good) 4-strokes weigh less than 2-strokes with equivalent power output.

Now, when we get to gas, it is a whole other story. Why is it on larger gas engines, such as those found in cars, or in full-scale aviation, they use 4-strokes, yet for smaller applications, such as our models, or some motorcycles, they use 2-strokes? Is there an efficiency problem with 4-stroke gassers that is reduced as displacement increases? I think even in the gas world, 4-strokes produce more torque than 2-strokes. Does glow fuel lend itself better to 4-stroke combustion cycles than gasoline?

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RE: Considering a large Glow engine ??? For big eng... - 10/3/2006 9:17:15 PM   
Sport_Pilot



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quote:

ORIGINAL: Hobbsy

I had a three year old Ryobi 26cc fourstroke weed wacker and it was piece of junk from day one, I gave it to my neighbor and got a Stihl. I don't have to wear my arm out to start the Stihl, starts on the first pull every time.



I think the Ryobi's are the cheap ones you see sold cheap. The MTD's may be better. I don't think I have seen anyone with a Stihl weedwacker. Me? My 16 year ole Weed eater is still going strong. As is my 25 year old Honda mower. They lawnmower burns more oil than the weedwacker.

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RE: Considering a large Glow engine ??? For big eng... - 10/4/2006 6:15:35 PM   
JettPilot



Posts: 1151
Joined: 4/18/2005
From: Paradise, USA
Status: offline 		The best 4 stroke gas engine for RC conversion right now is the Honda 32 CC. There just has not been a market for more expensive 4 stroke gas engines small enough for RC until now, but that is changing. With environmental concerns, expect to see more and lighter 4 stroke small gas engines developed for lawn equipment use, weedwhackers, blowers etc.

JettPilot

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RE: Considering a large Glow engine ??? For big en... - 10/4/2006 6:24:40 PM   
Sport_Pilot



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quote:

The best 4 stroke gas engine for RC conversion right now is the Honda 32 CC.


I don't doubt you cause I don't really know. But the last couple or so conversions I have seen on the conversion forum are the Briggs and Stratton 34.

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RE: Considering a large Glow engine ??? For big en... - 10/4/2006 6:27:32 PM   
Sport_Pilot



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quote:

4-stroke glowies have gobs of torque compared to 2-stroke glowies.


That's not only incorrect its backwards. Two stroke glow has more torque and power. The advantage of four stroke is their lighter muffler, thus allowing installation of a larger engine. That advantage is lessened somewhat with the larger sizes.

< Message edited by Sport_Pilot -- 10/4/2006 6:28:12 PM >

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RE: Considering a large Glow engine ??? For big en... - 10/4/2006 6:29:31 PM   
jlkonn



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Status: offline 		http://www.rcuniverse.com/market/item.cfm?itemId=226635

JLK


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RE: Considering a large Glow engine ??? For big en... - 10/4/2006 6:30:02 PM   
RVM


 

Posts: 1975
Joined: 3/12/2006
From: Sacramento, CA, USA
Status: offline 		I was always led to believe this... but as always I can be wrong.


quote:

ORIGINAL: Sport_Pilot

quote:

4-stroke glowies have gobs of torque compared to 2-stroke glowies.


That's not only incorrect its backwards. Two stroke glow has more torque and power. The advantage of four stroke is their lighter muffler, thus allowing installation of a larger engine. That advantage is lessened somewhat with the larger sizes.



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RE: Considering a large Glow engine ??? For big en... - 10/4/2006 6:33:24 PM   
RVM


 

Posts: 1975
Joined: 3/12/2006
From: Sacramento, CA, USA
Status: offline 		If 2-strokes are so good, why are most engines in the world 4-strokes? More efficient or something?

Sorry, I'm no engineer.

< Message edited by RVM -- 10/4/2006 6:34:24 PM >

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RE: Considering a large Glow engine ??? For big en... - 10/4/2006 6:46:14 PM   
Sport_Pilot



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quote:

ORIGINAL: RVM

If 2-strokes are so good, why are most engines in the world 4-strokes? More efficient or something?

Sorry, I'm no engineer.



Yes, but since modern improvements in two stroke technology, the advantage is slim. Two strokes dominated in dirt motorcycles because of their torque and light weight. The larger muffler didn't really matter because the motorcycle four stroke needs an exhaust pipe that is longer than the two stroke muffler, and not much lighter. But they are being replaced by four strokes because of environmental issues. As the size is reduced the muffler size in relation to engine size is greater. A .91 sized four stroke is about the same weight as a modern .61 two stroke. Never mind that some modern two strokes are overweight pigs. There are some two strokes that show what they could weigh, but none are made by a popular brand.

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RE: Considering a large Glow engine ??? For big en... - 10/4/2006 6:58:58 PM   
Ed Cregger



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From: Ringgold, GA, USA
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quote:

ORIGINAL: RVM

If 2-strokes are so good, why are most engines in the world 4-strokes? More efficient or something?

Sorry, I'm no engineer.



-------------


While two-strokes are simpler mechanically than four-strokes, their operating parameters, and tight control of same, are not. It is much easier to burn up a two-stroke engine than a four-stroke engine, unless the two-stroke engine is severely detuned.

One thing lots of folks do not realize is that a two-stroke engine can only be properly tuned under loaded conditions, or the conditions under which it will be operating. Change the load even slightly and you have changed the mixture requirements. A four-stroke engine, which also benefits being tuned under loaded conditions, is easier to adjust and is not as likely to seize or hole a piston if you get it wrong.

Four-strokes, especially spark ignited/gasoline fueled versions, are much better suited for set and forget operation. Four-strokes are less demanding of the operator for successful operation.

How many folks drive a few hundred miles in their car and then have to stop to clean and regap the spark plugs? Not many, because they are driving four-stroke engines in their cars. Anyone seen movies including the Soviet made two-stroke powered cars some years ago. That is what you had to do with them. I would love to own one of those, just for kicks. <G>



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Artisan

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RE: Considering a large Glow engine ??? For big en... - 10/4/2006 7:10:14 PM   
Sport_Pilot



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From: Acworth, GA, USA
Status: offline 		Ed,
That is way out of date. Modern engines have electronic ignition and fuel injection which now makes your statement false. Also you have the fragility of engines backwards, it has always been the two stroke that is harder to break. Mostly because they have no valves. That is why the old Lawn Boy mowers are so popular with some.

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