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Small Engine Comparison
Engine
2YM15
2GM20F
3YM20
3YM30
Atomic 4
Atomic 4
HP
14
18
21
29
30
30
Reduction
2.6:1
1:1
2:1
Weight pounds
227
251
266
271
330
345
Width in.
18.2
19.0
18.2
18.2
19.31
19.31
Length in.
24.1
25.60
27.3
28.2
26.6
32.68
Height in.
20.8
22.32
20.8
21.5
19.31
19.31
Height above prop shaft in.
16.3
18.38
16.3
17.0
13.125
14.16
Prop size
14 x 13
12 x 10
14 x 10
Number of blades
3
3
3
3
2
2
We recommend a 3-blade prop be used as it gives better thrust, less vibration, and better reversing.
             
Large Engine Comparison
Yanmar Diesel
GM Gas
Engine
  
4LHA-STE
6PLA-DTE
6LPA-STE
350
454
Horsepower  
230
250
300
350
454
Weight w/gear in pounds  
932
942
1044
870
1025
Bobtail weight in pounds  
827
837
899
741
871
Bobtail length in.  
28.5
35.5
35.5
26.0
29.5
Length w/gear in.  
41.69
47.4
47.4
50.5
53.6
Width in.  
26.6
26.4
26.4
27.5
31.8
Height in.  
28.46
28.7
29.1
30.36
32.0
Height above crank shaft in.  
19.0
19.37
19.75
19.6
20.75
Height above prop shaft in.  
24.6
25.0
25.4
19.6
20.75
             
Yanmar transmission ZF 63A
GM transmission Warner 72 series w/reduction
Yanmar is easily adapted to Mercruiser Bravo Drives