4 Stroke (Cycle) Questions - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-12-2006, 07:42 AM   #1
Wayne MIller
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4 Stroke (Cycle) Questions

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I'm venturing into 4 strokes and have some questions. I hope someone can help with the answers.

I understand a rough estimation for conversion from 4 cycle to 2 cycle for a plane is roughly 60 to 70%. That is, a 1.00 4 cycle will comfortably haul a plane designed for a .60 to .75 2 cycle. Is this true?

Also, how does the fuel consumption for a 4 cycle compare to a 2 cycle. That is, will a 1.00 4 cycle have better or worse fuel consumption than a .60 2 cycle?

I notice at the hobby shop they have 2 cycle and 4 cycle fuel, but I have heard you can use 2 cycle fuel in 4 cycle engines. Does anyone have any comments on this?

Should castrol, synthetic or castrol/synthetic blend be used?

Any help would be appreciate. Thanks for your help.


Wayne Miller
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Old 07-12-2006, 08:22 AM   #2
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The 60-70% rule is still safe to use but some of the engines nowadays are more like 80-90..
Fuel use is a bit lower but not 50% like some would think, (4-stroke firing on every other stroke, 1/2 of a 2-stroke)..
I have been using 15% (nitro) 2 stroke fuel in all of my 4-strokes lately, because got a good deal on it.. I don't notice any difference in running.. 2-stroke fuel has a little more oil in it than 4-strk... A difference of a couple %, depends on the brand...
As far as the oil blend goes... I use a blended fuel 90% syn 10% castr, but other blends are fine too (like I said got a good deal on this fuel so I'm going to use it)...
Stick with one of the 3 major brands OS, Saito, or Enya they each have there +'s and -'s .. In a nutshell (There's gona be some arguarguementse )
OS - easiest to use, good power
Saito- bit harder to use, but real good power
Enya - easy to use, lasts a long time (durable)

Not saying that the all 3 don't have these traits but some exell in parts than others do...

If I was recommending one to you I would say get an OS for your first one, I own all 3 plus a few funky ones (Webra, HP....) And I (just my opinion) think the OS is good start...
Darren loves Floatplanes and dirt bikes
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Old 07-12-2006, 11:17 AM   #3
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Hi Wayne, have a look at the RCV line of engines also, especially if you want to swing a big prop look at the RCV-SP line. cheers.....Karl
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Old 07-12-2006, 11:43 AM   #4
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I used to work for the local hobby shop a few years back and had the oportunuty to speak with the byron fuel plant. I asked them what is the diofference between 2 and 4 stroke fuel and he giggled and stated that it is the same fuel from the same vat excpet the label. Hestated that this was for the modeler who demanded 4 stroke fuel because the instuctios said so .
Now this was about 8-9 years ago so at this point in time it could have changed.
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Old 07-12-2006, 10:02 PM   #5
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What about glow plugs? What's the difference between 2 stroke and 4 stroke plugs? Can you use a 2 stroke plug in a 4 stroke engine and vise versa or is that a recipe for disaster?
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Old 07-12-2006, 10:49 PM   #6
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You want a good 4 stroke plug. I've tried many and prefer the OS F plug. OS F plug has a heavier coil in it to help carry the heat as the propeller has to make 2 revolutions before the plug detonates. Even good 2 stoke plugs don't have a heavy enough coil.
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Old 07-13-2006, 08:51 AM   #7
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Four strokes use a hotter plug than two strokes, as they have to hold the heat long enough to fire the fuel air mix on the compression stroke following the exhaust stroke.
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Old 07-13-2006, 11:49 AM   #8
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For some time now I have been using a YS plug rather than an OSF in all my fourstrokes. Most of the guys at the field order them once they try them. Even with on board glo they last a season. They are still good when I swap them out. The best part is the cost $5.39 each US


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Old 07-13-2006, 01:22 PM   #9
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wow, this place (central hobbies) has OS type F glow plugs for $5.49. i just paid $12CAD per plug
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Old 07-13-2006, 05:55 PM   #10
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Not to hi-jack but does the blade profile or brand of propeller make a difference when running a four stroke.

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