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PISTON SIZES

MAMOD CYLINDER/ PISTON DIMENSIONS IN INCHES and MMs.

This is what we found but your dimensions could be different.

Engine End to  Port to Piston 
Type port trunion Rod
       

SE1 & 1A

 

0.500 ins

12.70mm & 15.27mm

2.50 - 2.60 - 2.70 ins

63.5 to 68.58mm
SE2 (1948)

0.158ins

4.01mm

 

0.3125ins

7.29mm

  

 
SE2 (1954

0.138ins

3.50mm

0.500ins

12.70mm & 15.27mm

2.50 - 2.60 - 2.70ins

63.5 to 68.58mm
SE2A (1970)

0.148ins

3.76mm

0.375ins

9.53mm

2.50 - 2.60 - 2.70ins

63.50 to 68.58mm
SE3

0.177ins

4.50mm

0.500ins

12.70mm & 15.27mm

2.50 - 2.60 - 2.70ins

63.50 to 68.58mm
MM1

0.210ins

5.33mm

0.385ins

9.78mm

1.224ins

31.09mm
MM2

0.138ins

3.50mm

0.382ins

9.70mm

1.673ins

42.49mm
SP4/5

0.130ins

3.30mm

0.610ins

15.27mm

2.510ins

63.75mm
CURRENT STANDARD

0.138ins

3.50mm

0.382ins

9.70mm

1.673ins

42.49mm
       
         Crank hole centre to piston proper.
    Steam inlet to tunnion (centres)  
  End of cylinder to steam hole    

We have found that there is no "standard" for SE engine pistons.

So, we have written down the range of lengths found, from
crank hole to the piston proper and not including the
piston. In other words from the cylinder to the crankshaft pin
when fully extended.

We have found that the piston diameter ranges from 0.311 to 
0.315 with the upper size causing a problem in matching to a
cylinder.

If you want further clarification please call Trevor on 01273 493624.