Welcome Guest [Log In] [Register]
Home

Welcome to the CJ-3B Bulletin Board, the discussion forums section of the website CJ3B.info. Everyone is invited to view the postings here, but you must register as a member in order to post messages. The moderator reserves the right to remove items posted. Items may be archived in the Tech Tips section of the website. If you post a tech problem, please follow up by posting the solution when it is found, as it may be useful to other readers. For forums covering other Jeep models, see the bottom of this page.

Search for keywords or phrases anywhere in the CJ-3B Bulletin Board using Google. Enter key words here.

Google
WWW CJ-3B Bulletin Board
You're currently viewing the forums as a guest. This means there are some features you can't use. If you register, you'll be able to post messages and use member-only features such as customizing your profile and sending personal messages. Registration is simple and free.


Join the CJ-3B Bulletin Board!


If you're already a member please log in to your account to access all of our features:

Username:   Password:
Add Reply
Calculate RPM at given speed
Topic Started: Oct 30 2013, 01:04 PM (258 Views)
SteveK
Member
[ *   *   *   *   *  ]
FYI... The following site will calculate your RPM's at a given speed if you know tire diameter, rear end ratio, and final ratio of transmission (1, OD, etc)

http://www.csgnetwork.com/multirpmcalc.html

With a 4.56 rear end, 26" tire size, and 1:1 trans final gear ratio, it says RPM should be 3241 RPM's at 55 MPH.

You can plug in your own specifics to get what your Willys may be turning. Helpful if speedo seems off and and you have a tachometer, or you have changed tire size or ratios, or want to know impact first.

It says my new 29" tires will reduce the RPM's to 2906 RPM's, and 3500 RPM's should yield 66 MPH (but not for long, I'm sure), and my speedo should be 11.5% slow from actual. I'm getting an adapter to correct that.

Something that may be needed some day by someone.
SteveK
62 Dispatcher
South Florida
Offline Profile Quote Post Goto Top
 
« Previous Topic · DJ-3A Dispatcher Posts · Next Topic »
Add Reply

Other Willys Jeep forums:

The CJ-2A Page has a CJ-2A Message Board.
There is also a CJ-3A Page Forum.
For CJ-5 and Dauntless V6 postings, see the Early CJ-5 Bulletin Board.
The Old Willys Forum is dedicated to wagons and pickups.
Surrey Gala and Dispatcher Jeeps are under DJ-3A Dispatcher Posts.
The M38/M38A1/M606 Preservation Group has a forum.
For other CJ and military Jeeps, see the g503 Message Boards.
See the Forward Forum for Forward Control Jeeps.
To post ads for other Willys parts or Jeeps, see the WillysTech Buy/Sell/Swap Message Board.
For tech problems with other Willys models, try the WillysTech e-mail list.
The Bantam Trailer forum covers Jeep trailers.