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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Two-strokes VS Four-strokes -- Do I dare?
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Two-strokes VS Four-strokes -- Do I dare? - 3/10/2002 6:21:57 AM   
Elwood



Posts: 1512
Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		Thanks, Jack.

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Born in the U.S.A.......Not quite as long ago as Art!!!!!!!

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Two-strokes VS Four-strokes -- Do I dare? - 3/10/2002 8:11:24 PM   
shoom



Posts: 45
Joined: 1/7/2002
From: Corrigin, AUSTRALIA
Status: offline 		well for my two cents I reckon nothing beats the sound of a weber fed mazda rotary engine..

also elwood, all your dreams might be answered with one of the glow V8s available for rc cars!

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it's a bird, it's a plane, it's.... crashlandio airlines!!

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Two-strokes VS Four-strokes -- Do I dare? - 3/10/2002 10:12:08 PM   
MiL



Posts: 281
Joined: 1/22/2002
From: Bend, OR, USA
Status: offline 		As far as cool sounding engines go.. a couple years ago i had a Polaris XLT snowmobile. It's a liquid cooled 600cc inline triple 2 stroke. With triple pipes (each cylinder gets its own expansion chamber) and teeny tiny little spark arrestor/silencers on each line, it sounded beastly. There is something about a snowmobile on a long hillclimb that is an incredible power rush. Maybe it's because of the clutching system which keeps the motor at peak RPM for the entire run. In any case, that thing sounded like a screaming banshee when it hit 9,000 rpm. At an idle it popped and sputtered like a top fuel dragster, also adding to the coolness in my opinion.

Now we run 700cc twins, not as cool sounding, but much more power overall, better throttle response, and more useable power.

Btw, the 600cc 2 stroke snowmobile also made right around 100hp (probably about 95-98), the same as my 600cc motorcycle discussed earlier. However, it is significantly lighter and more compact.

In my opinion both sound much cooler than any r/c motor i've ever heard. <--- R/C related, please don't hang me

I almost forgot about the Yokomo RX .12 that i had in my RC10GT. That thing sounded kinda cool if only for the fact that it revved so high it sounded like it should have been going into some kind of atomic meltdown or something. I'd imagine it must have revved to 20 or 30 thousand rpm... something rediculous like that.

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Two-strokes VS Four-strokes -- Do I dare? - 3/11/2002 12:17:42 AM   
Elwood



Posts: 1512
Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		The Novarossi .12 on my GT does 36,000 rpm.

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Born in the U.S.A.......Not quite as long ago as Art!!!!!!!

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Two-strokes VS Four-strokes -- Do I dare? - 3/11/2002 2:24:00 AM   
ChuckAuger



Posts: 5134
Joined: 12/5/2001
From: Pampa, TX, USA
Status: offline 		Here is a link to an impressive scratch built model of a Ferrari 312.

The link may not be working...I can't tell if it is on my temp folder, somebody give it a shot. It has a scratch built fuel injected dry sump flat twelve 150cc, with a 5 speed (and reverse) scratch built gear box.


http://www.johnegerton.co.uk/cmcc/ferrari312.rm


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Breaking the Speed of Sound, Straight Down!

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Two-strokes VS Four-strokes -- Do I dare? - 3/11/2002 2:26:40 AM   
kylenlord


 

Posts: 87
Joined: 3/9/2002
From: Colchester CT
Status: offline 		What about those old rotary engines in the Sopwith Pup, and Triplane? The ones that didn't have a throttle, just an on and off switch. The whol engine would spin around with the prop, right? Why doesn't someone make an engine like that for an r/c plane? The one thing I don't like about 4-strokes, is the price. Not the initial price but the repair price. If you crash a two stroke at full throttle, you leave a nice dent and maybe a broken needle valve. Then you just bring it home and wash it out with some fuel and oil. If you crash a four stroke, you end up bending some rocker arms, and other things that I have no idea of their purpose. When I augered in my O.S. 91 FS with a pump in, it cost$150 dollars or so to replace everything that was broken.


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Glenn: Why don't you come chat with us about the Leader at the welcome center?
Homer: Will there be beer?

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       Post #: 31

Re: 4444 strokes - 3/11/2002 2:58:19 AM   
desmobob



Posts: 594
Joined: 12/2/2001
From: Whitehall, NY, USA
Status: offline 		[QUOTE]Originally posted by Todd 74
And, yes, a four-stroke single has got to be the most annoying sound in the world........ [/QUOTE]

Oh no! You've got to get to a vintage motorcycle roadrace event and listen to some of the great singles! It's a music of a different sort. (Although I've grown to hate the sound of the 4C singles in the 4-wheel ATVs that are constantly running around the woods behind my house.)

My Kawasaki KLR 650 single sounds great thumping through the SuperTrapp aluminum racing series can. Bra-a-a-a- ppp!

I most prefer the sound of my Ducati 900SS, though.... ;-)

I heard the model V-8 running at the WRAM show last month, although only at a high idle. Sounded pretty nice!

Good flying,
Bob Scott

(in reply to ChuckN)
       Post #: 32

Two-strokes VS Four-strokes -- Do I dare? - 3/11/2002 11:48:38 AM   
Dave Bowles


 

Posts: 575
Joined: 1/7/2002
From: KS
Status: offline 		There was a referance earilier about comparing power of the same size 4 stroke and 2 stroke. The fact is you can't make a normally asperated 4 stroke put out as much power as a 2 stroke (as far as model engines and small gas engines) because it is only firing half the amount of times for a given RPM , So that is why you have a 250cc 4 stroke racing 125 cc 2 stroke . Although , some of our model 4 strokes are running with the same size two strokes depending on the application. The best reason I like 4 strokes is because it is less annoying to our non- modeling people close to runways, I suspect someday that the noise requirements will someday do away with all glow engines in some areas and only electric will be allowed.

(in reply to ChuckN)
       Post #: 33

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Two-strokes VS Four-strokes -- Do I dare?
Page: <<   < prev  1 [2]





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