# Thread: Question that has been bothering me

1. ## Question that has been bothering me

So I have been hearing different names for the "big" 2 stroke engine. Is it 947cc or 951cc? Fun fact: I use to rebuild them, and never knew!

2. 951
You can calculate it from the bore and stroke
Bore = 88mm = 8.8cm
Stroke = 78.2mm = 7.82cm

Displacement = 3.14 x (Bore/2)^2 x Stroke x (Number of Cylinders)

Displacement = 3.14 x (8.8/2)^2 x (7.82) x 2 = 951.24 cm^3

3. Seadoo used to end all of the CC's in 7's..
587
657
657x
717 (really a 719.2 or something)
787
947 (951)

4. Originally Posted by dsolie
Seadoo used to end all of the CC's in 7's..
587
657
657x
717 (really a 719.2 or something)
787
947 (951)
+1

Why we'll never know, but this wasn't actual displacement.

5. The "7" as the last digit of the engine moniker indicated a Rotax Marine engine.

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