Jump to content
The mkiv Supra Owners Club

Oversquare, Undersquare, and Bore/Stroke Ratio


Jellybean

Recommended Posts

I am sure Chris Wilson will love this :)

 

Anybody have any experience with this and advs, disadvs

 

http://performancetrends.com/blog/?p=5

 

Oversquare vs undersquare referrs to the Bore/Stroke ratio of an engine. If the bore is larger than the stroke, the engine is considered to be oversquare.

 

How much torque an engine can make is based on its cubic inches. Torque comes from how much air the engine caningest every intake stroke. The more the cubic inches, the more air it can take in every stroke.

 

How much HP an engine can make is based on the total valve area. HP comes from the total air the engine can ingest per unit time, like every second. The intake valve it typically the largest restriction for air flow in an engine. Therefore, an engine with more intake valve area (total valves in the engine x valve area) can ingest more air than one with less valve area. Or, it can rev higher before it runs out of breath. Higher revs mean more HP.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.