Skip to content
View in the app

A better way to browse. Learn more.
rollaclub.com

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

5k Compression Ratio

KE-JG
in Automotive Discussion

Featured Replies

Anyone know what the compression ratio is for a standard 5K?

 

I measured it by filling the combustion chamber with oil, etc. to be about 8.5, but that seems a bit low.....

 

I'm now running on LPG, so could handle 10.5. Anyone know how much to take off the head to get 10.5???

As far as I know stock 5K is 9.0

My 5K was running 9.5:1. Its in the head shop now getting bumped up to 10:1 (and new valve springs). I heard the bloke say he would shave the head 30thou to bump it up half a ratio.

Please sign in to comment

You will be able to leave a comment after signing in

Sign In Now
Go to topic listing

Account

Navigation

Search

Search

Configure browser push notifications
Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.