Model Engine Company of America
Learn about model engine sizes.

Most model engines are designated in cubic inch sizes. A .46 is 0.46 cubic inches(less than half a cubic inch) or converted into metric it is 7.5cc

Since the USA was the biggest producer of model engines in volume and before and after the war the cubic inch size became and still is the standard of the world.

Size designation started prior to WWII with competition class sizes

Class "D" was the biggest at .65 cubic inch and over size
Class "C"up to a .65 cubic inch size
Class "B" up to a .20 cubic inch size
Class "A" up to a .10 cubic inch size
Class "½A" up to a .05 cubic inch size

This is why you find engines in sizes of .09, .19, .29 etc. Only as of the past 15 or so years have other sizes become the norm like .25 and .28

Metric has played a role in the sizes also.

For instance a .15 cu in is the same size as 2.5cc

Here is a conversion chart for the popular sizes
Cubic Inch Cubic Centermeters
.06 1
.09 1.5
.12 2
.15 2.5
.21 3.5
.26 4
.30 5
.36 6
.40 6.5
.45/.46 7.5
.49 8
.60 10
.91 15
1.20 20
1.50 25
 
To determine the dispacement of any engine
 
 
The above information is provided as a guide. Since MECOA/K&B has no way of determining the ability of the individual using and understanding this information, we assume absolutely NO RESPONSIBILITY for any damage to person or property from the use of this information.
 

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