Bore vs stroke

General Chat
1

So ive been wondering,
whats the difference between a engine having a bigger stroke than bore and vice versa?

Short but powerful question. :smiley:

thx in advance!

2

In essence, bore is the diameter of a cylinder, and stroke is the length of one up or down motion of a piston. This should provide some insight into how they affect engines.

3

A couple things.

  1. Higher stroke means more stress on the bottom end at high rpm
  2. Lower bore means less stress on the top end at high rpm
  3. Bigger bore makes a much heavier engine
  4. Bigger bore makes a more expensive engine (more materials)
  5. Bigger bore lowers your octane requirement
4

I will add also to the gt1cooper list this --> Bigger bore = bigger valves = heavier valves = earlier valve float

5

that’s pretty much the same as the lower bore meaning less stress in Cooper’s list :stuck_out_tongue:

6

Also, this is more of a problem in real life than in the game, but smaller bore can make it harder to put many valves per cylinder.

7

[quote=“gt1cooper”]A couple things.

  1. Higher stroke means more stress on the bottom end at high rpm
  2. Lower bore means less stress on the top end at high rpm
  3. Bigger bore makes a much heavier engine
  4. Bigger bore makes a more expensive engine (more materials)
  5. Bigger bore lowers your octane requirement[/quote]

Thx, was looking for this info.
You’re going in my list of heroes!! :stuck_out_tongue:

8

I’m a hero! :open_mouth: someone save the world from me!

9

[quote=“gt1cooper”]A couple things.

  1. Higher stroke means more stress on the bottom end at high rpm

  2. Lower bore means less stress on the top end at high rpm

  3. Bigger bore makes a much heavier engine

  4. Bigger bore makes a more expensive engine (more materials)

  5. Bigger bore lowers your octane requirement[/quote]

  6. Super true

  7. To some extent, as bigger bore means bigger and heavier valves

  8. Yep

  9. Yep

  10. Wrong way around, bigger bore need more octane

Also im fairly sure bigger bore = more valve area and head flow.

10

[quote=“Daffyflyer”]

[quote=“gt1cooper”]A couple things.

  1. Higher stroke means more stress on the bottom end at high rpm

  2. Lower bore means less stress on the top end at high rpm

  3. Bigger bore makes a much heavier engine

  4. Bigger bore makes a more expensive engine (more materials)

  5. Bigger bore lowers your octane requirement[/quote]

  6. Super true

  7. To some extent, as bigger bore means bigger and heavier valves

  8. Yep

  9. Yep

  10. Wrong way around, bigger bore need more octane

Also im fairly sure bigger bore = more valve area and head flow.[/quote]

Ah, 5 was the only one which I was unsure about. I wanted to test it, but didn’t have access to my computer.