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Engine RPM Calculator

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Engine RPM Calculator
Peanut Butter

Peanut Butter

Full Time Jeeper
Posts
2,591
Thanks
15
Location
Boerne, Texas
Vehicle(s)
1979 Jeep CJ7 TH400 Automatic 258 I6 Quadratrac Amc 20 rear & Dana 30 front, 32 x 11.5 x 15 tires. Currently a Complete Custom Rebuild in progress.

Also I own a 2001 Jeep Cherokee, White, all stock with 4.0L. automatic, and police package. Best part of that is it came with leather seats! This package also has the NP242 Transfer Case, 8.25 rear end, and trailer towing package.
<div class="bbWrapper">Want to input your tire size and gear ratio to get the rpms your engine will run at different speeds? Go over to Muscle Car at Power Block TV and click on the calculator on the upper right. Nice tool. Need some transmission gear info, just scroll down the page with the calculator! Rod</div>
 
<div class="bbWrapper">Cool. Thanks for sharing.<br /> <br /> Here&#039;s a chart I made. You want to shoot for the green. It shows engine RPM at 60 MPH<br /> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. Please try again later.", "lightbox_start_slideshow": "Start slideshow", "lightbox_stop_slideshow": "Stop slideshow", "lightbox_full_screen": "Full screen", "lightbox_thumbnails": "Thumbnails", "lightbox_download": "Download", "lightbox_share": "Share", "lightbox_zoom": "Zoom", "lightbox_new_window": "New window", "lightbox_toggle_sidebar": "Toggle sidebar" } </script> <div class="bbImageWrapper js-lbImage" title="_35422.jpg" data-src="/community/proxy.php?image=http%3A%2F%2Fwww.jeep-cj.com%2Fgallery%2Ffiles%2F1%2F6%2F7%2F1%2F_35422.jpg&amp;hash=b82d940b62ad1754037878a72b82e232" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="" data-url="http://www.jeep-cj.com/gallery/files/1/6/7/1/_35422.jpg" class="bbImage" data-zoom-target="1" style="" alt="_35422.jpg" title="" width="" height="" /> </div><br /> And <a href="http://www.jeep-cj.com/forums/members/derf/" target="_blank" class="link link--external" data-proxy-href="/community/proxy.php?link=http%3A%2F%2Fwww.jeep-cj.com%2Fforums%2Fmembers%2Fderf%2F&amp;hash=f024204f942cb2f6c9162035dd37ebf8" rel="nofollow ugc noopener">derf</a> made this much more informative gearing calculator: <a href="http://www.grimmjeeper.com/gears.html" target="_blank" class="link link--external" data-proxy-href="/community/proxy.php?link=http%3A%2F%2Fwww.grimmjeeper.com%2Fgears.html&amp;hash=8c4a7e11ba209b85961c229d5d1bea80" rel="nofollow ugc noopener">Gear Ratio Calculator</a></div>
 
<div class="bbWrapper">Great chart!<br /> <br /> Don&#039;t forget Grimm --&gt;&gt; <a href="http://eriejeeppeople.com/Jeep_tech/tire_size_gear_ratio/ratio_calculator/gears.htm" target="_blank" class="link link--external" data-proxy-href="/community/proxy.php?link=http%3A%2F%2Feriejeeppeople.com%2FJeep_tech%2Ftire_size_gear_ratio%2Fratio_calculator%2Fgears.htm&amp;hash=dd3f0710c703162f68ef9bd867dc5c6f" rel="noopener">Grimm&#039;s Ratio Calcs</a><br /> <br /> and <br /> <br /> --&gt;&gt; <a href="http://www.manoian.net/jeep/gear_ratio_calculator.html" target="_blank" class="link link--external" data-proxy-href="/community/proxy.php?link=http%3A%2F%2Fwww.manoian.net%2Fjeep%2Fgear_ratio_calculator.html&amp;hash=4d39f5f24f521d679ee835adf8160b56" rel="noopener">Gear Ratio Calculator</a></div>
 
<div class="bbWrapper">Or ((336 x road speed x axle ratio) / (tire diameter in inches - 1)) x transmission gear ratio = rpms</div>
 
Last edited:
<div class="bbWrapper"><blockquote data-attributes="member: 1" data-quote="CJ" data-source="post: 159825" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/community/goto/post?id=159825" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-159825">CJ said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Great chart!<br /> <br /> Don&#039;t forget Grimm --&gt;&gt; <a href="http://eriejeeppeople.com/Jeep_tech/tire_size_gear_ratio/ratio_calculator/gears.htm" target="_blank" class="link link--external" data-proxy-href="/community/proxy.php?link=http%3A%2F%2Feriejeeppeople.com%2FJeep_tech%2Ftire_size_gear_ratio%2Fratio_calculator%2Fgears.htm&amp;hash=dd3f0710c703162f68ef9bd867dc5c6f" rel="nofollow ugc noopener">Grimm&#039;s Ratio Calcs</a><br /> <br /> and <br /> <br /> --&gt;&gt; <a href="http://www.manoian.net/jeep/gear_ratio_calculator.html" target="_blank" class="link link--external" data-proxy-href="/community/proxy.php?link=http%3A%2F%2Fwww.manoian.net%2Fjeep%2Fgear_ratio_calculator.html&amp;hash=4d39f5f24f521d679ee835adf8160b56" rel="nofollow ugc noopener">Gear Ratio Calculator</a> </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0"><span style="color:orange">Click to expand...</span></a></div> </div> </blockquote> These are my favorites.<img src="/community/smilies/notworthy.gif" class="smilie" loading="lazy" alt=":notworthy:" title="Notworthy :notworthy:" data-shortname=":notworthy:" /><br /> I like that it&#039;s so easy to change things and see what happens.<img src="/community/smilies/biggrin.gif" class="smilie" loading="lazy" alt=":D" title="Grin :D" data-shortname=":D" /></div>
 
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