Displacement

    Royal Enfields have been built in several different displacements, some with different bores & strokes. Here are some of the more common with comments on application.

Royal Enfield Bore & Stroke Data

ID

Type

Size, CC

Bore, MM

Bore, Inches

Stroke, MM

Stroke, Inches

Rod, Inches

Rod, MM

Rod Ratio

4K
P-speed

5K
P-speed

1  

500 Twin

  495

    64

2.520

    77

3.031

  7,918

  9,898

2  

Meteor Minor

  496

    70

2.756

    64.5

2.539

  9,453

11,816

3  

Constellation

  693

    70

2.756

    90

3.543

  6,774

  8,467

4  

Interceptor

  736

    71

2.795

    93

3.661

  6,556

  8,194

5  

Bullet single

  693

    70

2.756

    90

3.543

  6,774

  8,467

6  

Interceptor

  736

    84

2.795

    90

3.661

  6,556

  8,194

“4K, 5K P-speed”: RPM at 4,000, 5,000 feet per minute piston speed ID:
  1.  *-1958 twin
  2.  1958-* twin
  3.  Meteor, Super Meteor twin
  4.  Interceptor twin
  5.  
  6.