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Gas equivalent

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Old 03-16-2008, 01:48 PM
  #1
vasek
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Default Gas equivalent

Hi,

I would like to know how to define gas engines size(s).

Lets say a glow 2c is 1.40, the equivalent in glow 4c is 1.60 ( or "one size" up), now what would a gas equivalent in cc be? what is the rule of thumb?

thanks,
V.
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Old 03-16-2008, 01:55 PM
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Default RE: Gas equivalent

I'd say 26cc.
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Old 03-16-2008, 02:40 PM
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Default RE: Gas equivalent

1.20=20cc, 1.40=23cc, 1.60=26cc. Thats just the displacement though.
A 20cc gaser is like a 90 sized glow, to make 1.6 glow power you are looking at 35-40cc gas
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Old 03-16-2008, 02:55 PM
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Default RE: Gas equivalent

You would probably need a 1.80 4 stroke to equal the power of a 1.40 2 stroke glow engine in most cases. Guesstimating 2 stroke to gas is about like doing the same with glow radial engines as far as any rule of thumb to start out on.

I'm still a bit fuzzy on converting 4 stroke, gas engines to anything else right now.
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Old 03-16-2008, 05:07 PM
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Default RE: Gas equivalent

Same engine, same case etc, the glow engine will be about 10% to 15% stronger than the gas engine, if you can get it to run right.
Few manufacturers succeeded in producing glow engines in excess of 1.20 that ran right without special attention. The simplicity of glow ignition takes it's toll there.
Not to say that a 2.40 glow engine will be crap. It just needs some more considering before it is fit to use, as methanol racing engines prove without doubt. That is why the small gassers from 1.60 upward are taking over for the guy like you and me.
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Old 03-17-2008, 10:05 AM
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Default RE: Gas equivalent

thanks for your help!
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Old 09-08-2012, 04:05 AM
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I have an airplane that calls for a 30cc gasser. If I wanted to use a glow engine, what would be the size engine to use in either 2 or 4 stroke?
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Old 09-08-2012, 04:51 AM
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Quote:
ORIGINAL: im4rc

I have an airplane that calls for a 30cc gasser. If I wanted to use a glow engine, what would be the size engine to use in either 2 or 4 stroke?
A Moki 2.10
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Old 09-09-2012, 01:39 PM
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Default RE: Gas equivalent

I did a little research on my own & I think a Moki 2.1 would be too much. A 30cc engine equals 1.83 cu. in & an equivalent glow engine of the same displacement is more powerful than a gasser. Additionally, if I'm correct, a two stroke of 1.37 cu. in. would equate to a four stroke in the 1.8 cu. in. range. The question is, do you use a 1.8 four stroke or a 1.8 two stroke to replace a 30cc gasser? I'm at a loss on that question, so any help you might have would be appreciated.
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Old 09-10-2012, 03:45 AM
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Default RE: Gas equivalent

Use a 1.60 or 1.80 glow engine. MVVS or Moki have good ones.
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Old 09-10-2012, 06:55 AM
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Thanks for the info. I've got a Super Tiger 2500, Moki 1.8 & a Saito 180 4stroke. I guess any of them would work for a 12 pound airplane.
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