Comparison of two engines of the same displacement

  • Thread starter anhtho
  • Start date
  • #1
anhtho
9
0
Hi all,

I have this question, and hope you could help me to solve.

There are two engines with the same displacement (say 250cc). One with smaller piston and the other bigger. Of course the first one will move longer.
If everything else is the same or similar, generally, which engine is the stronger ?

Thanks for any input.
 

Answers and Replies

  • #2
Lsos
803
9
With a larger piston you can have crank/ rod geometry which favors higher rpm (because the piston acceleration is lower). Which means you can get more power.

I believe the longer stroke of the smaller piston favors higher low-end torque, which makes this the "stronger" engine (stronger, but less powerful).

I'm sure there is more to it than that, so someone else please chime in...
 
  • #3
syhprum
29
0
With a short stroke a problem arises with clearance for the valves makers of high performance engines tend to favour an equal bore and stroke a so called square design
 

Suggested for: Comparison of two engines of the same displacement

Replies
17
Views
611
Replies
4
Views
31
  • Last Post
Replies
4
Views
508
Replies
5
Views
355
Replies
12
Views
276
Replies
40
Views
864
Replies
18
Views
745
  • Last Post
Replies
4
Views
590
Replies
12
Views
1K
Replies
20
Views
3K
Top