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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> 2 or 4 stroke...
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2 or 4 stroke... - 2/22/2007 8:38:53 PM   
Zephirus79


 

Posts: 57
Joined: 11/9/2006
From: , GA, USA
Status: offline 		Been in the hobby for 6 months and still flying my trainer. I did put a bigger engine in it .55AX from OS. im gonna be getting my second plane soon and I still dont really know the difference between the 2 stroke and the 4 stroke. I hear the 4 stokes are much harder to tune and maintain. The only plus side I hear of them is that they sound more authentic and they burn less fuel... Just doesn't make sense to leave the 2 stroke, especially since they are much cheaper.
       Post #: 1

RE: 2 or 4 stroke... - 2/22/2007 8:55:40 PM   
Ed Cregger



Posts: 7744
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: online
quote:

ORIGINAL: Zephirus79

Been in the hobby for 6 months and still flying my trainer. I did put a bigger engine in it .55AX from OS. im gonna be getting my second plane soon and I still dont really know the difference between the 2 stroke and the 4 stroke. I hear the 4 stokes are much harder to tune and maintain. The only plus side I hear of them is that they sound more authentic and they burn less fuel... Just doesn't make sense to leave the 2 stroke, especially since they are much cheaper.



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


For sport flying, I agree with your conclusion. There is no reason to fly more expensive, more complicated four-stroke glow engines instead of two-stroke glow engines.

I own and still buy both types of engines of all brands. I don't play favorites that much.

However, if you have heard a four-stroke engine before, chances are that you will want to experience one, just for the heck of it. Then there is the less "peaky" behavior of four-strokes. Two-strokes tend to favor being ran wide open. Their power production is most pronounced when revving up (this is a generalization) because most two-strokes have been tuned to exhibit a lot of power in a higher rpm range than a four-stroke. As a result, when you do fly a four-stroke, you will most likely enjoy flying at part throttle and will like the quicker nature of a four-stroke's throttle response over a two-stroke glow engine.

Most folks that try a glow four-stroke slowly convert their engine fleet to exclusively four-stroke engines. Not all, but a fair percentage of them.

I've been flying two-strokes so long that I have no desire to give them up for four-strokes exclusively. There is absolutely no reason why we can't use both, now that four-stroke manufacturers recommend using a good two-stroke fuel for their operation.


Ed Cregger


< Message edited by Ed Cregger -- 2/23/2007 12:22:09 AM >


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(in reply to Zephirus79)
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RE: 2 or 4 stroke... - 2/22/2007 9:23:14 PM   
alan0899


 

Posts: 2023
Joined: 4/17/2006
From: Cundletown, NSW, AUSTRALIA
Status: offline 		G'day Ed,
I totally agree, we have students with 2 strokes & others with 4 strokes in their trainers, no big deal either way, but they all have someone to help them tune, & or maintain their engines, & both types, 2 or 4 stroke, teach the student about engine tuning & maintaining.

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RE: 2 or 4 stroke... - 2/22/2007 10:58:10 PM   
w8ye



Posts: 17488
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: online 		Four strokes are better in lower throttle setting applications.

Two strokes are much better for all out top end speed.

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       Post #: 4

RE: 2 or 4 stroke... - 2/23/2007 12:28:44 AM   
Campgems


 

Posts: 1924
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		I've gone to all four strokes. One point that hasn't been raised yet, there is less crud to clean off your plane at the end of the day with a four stroke.

One other point is noise. I'm guessing here, but I would think there would be less flying fields closing if only four stroks were used. They just don't have that ear shattering whine that the two strokes have. I hate to be in the air when a two stroke if flying also. It overpowers the engine noise from my plane and it is hard to hear what is going on.

Don

(in reply to w8ye)
       Post #: 5

RE: 2 or 4 stroke... - 2/23/2007 12:52:25 AM   
Rcpilot


 

Posts: 6556
Joined: 3/20/2002
From: Arvada, CO, USA
Status: online 		2-stroke fan here.

4-strokes are more expensive
4-strokes have more moving parts
4-strokes are sometimes heavier
4-strokes require more maintainence than 2-strokes (fact of life--no valves to adjust on a 2-stroke--you DO adjust the valves occasionally on a 4-stroke) more maintainence

I use 2-strokes for 3D. Anyone who says you can't 3D with a 2-stroke is just dead wrong. Yes, a 4-stroke does have quicker throttle response than a 2-stroke if you load it down with a big prop. But, a 2-stroke works just as well.

I've had 2 of the 4-stroke engines. First was a TT .91 LOVED IT. Bored it into the runway after just 1 gallon of fuel trying to do the inverted limbo at a fun fly contest. Didn't help that 200 guys were laughing their butts off at my expense. DOH!!

2nd 4-stroke engine I had was the OS 120 Surpass (non-pumped) It was the biggest pain in the butt I've ever had the misfortune of fuddling with. Total junk engine. It was a lemon, but I was too inexperienced at the time to realize it and send it back while it was still under warranty. I fuddled with it for 3yrs and finally took a sledgehammer to it one Sunday evening in the garage after another looooooooooong day of deadsticks and horrific problems with needles valves. Threw it in the trashcan with a grin so big the corners of my mouth were almost touching behind my ears. Good riddens. .

I'm just stuck on 2-strokes for their simplicity and raw HP. I'm so addicted to gasoline and oil mix now--that I've sold every glow engine I ever had except for 3 of the TH .75 and an AquaCraft .46 (Tower clone).

< Message edited by Rcpilet -- 2/23/2007 12:53:34 AM >

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       Post #: 6

RE: 2 or 4 stroke... - 2/23/2007 1:50:59 AM   
Hobbsy



Posts: 10683
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		I have gone to fourstrokes and Diesels, I rarely fly a glow 2 stroke. Fourstrokes need maintainance so seldom it does not count as a qualifier for a purchase descision. Fourstrokes rarely deadstick, and don't load up when just tooling around the patch and when you get done tooling around the patch, give it one notch of throttle or ten it does not matter, it just accelerates cleanly.

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       Post #: 7

RE: 2 or 4 stroke... - 2/23/2007 2:21:45 AM   
Checklst


 

Posts: 492
Joined: 12/19/2002
From: Alpharetta, GA, USA
Status: offline 		I agree with Ed, I fly both and love them all.............I let my plane pick the motor.......some planes just have to have 4 stroke and some just need 2C. As for the tuning not to much difference but 4c need a little more maintenance.....valve adjustments every once in a while, and of course they cost more up front.

(in reply to Hobbsy)
       Post #: 8

RE: 2 or 4 stroke... - 2/23/2007 3:40:59 PM   
asmund


 

Posts: 1907
Joined: 11/20/2005
From: Floroe, NORWAY
Status: offline 		You will need both! After I have been flying twostrokes for a while I start missing the sound and looks of my fourstrokes and the throttle control as well. But then again after some time with my fourstrokes I start missing the screaming two strokes too. I will keep all my two AND fourstrokes.

(in reply to Checklst)
       Post #: 9

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