CLASS RACER FORUM

CLASS RACER FORUM (https://classracer.com/classforum/index.php)
-   Stock and Super Stock Tech (https://classracer.com/classforum/forumdisplay.php?f=4)
-   -   rod journal size vs rpm (https://classracer.com/classforum/showthread.php?t=74983)

4speedracer 12-20-2019 01:34 PM

rod journal size vs rpm
 
I know the smaller the better but,what would someone say the highest rpm someone could turn a steel 2.123 sbf rod crankshaft without issue. Thanks

Everett Hill 12-20-2019 02:12 PM

Re: rod journal size vs rpm
 
all the small block fords are steel which one stock or after market,I have turned mine 10,000 at times mostly 9,000 to 9,500

340Cuda 12-20-2019 06:22 PM

Re: rod journal size vs rpm
 
I would say with all the race engines with 1.88, 1.85 and smaller rod journals, turn all the RPM you want.

Ed Wright 12-20-2019 08:53 PM

Re: rod journal size vs rpm
 
Quote:

Originally Posted by Everett Hill (Post 604262)
all the small block fords are steel which one stock or after market,I have turned mine 10,000 at times mostly 9,000 to 9,500

Wasn’t the question originally about crank journal diameter versus RPM?
That is about the surface speed of the bearing against the crank. Smaller crank journal diameter reduced the speed of the bearing against the surface of the crank.
Of course, you can usually get by with high surface speeds. Lower speeds improve reliability. “Honda rods” did not make mine any faster, but did reduce bearing wear.
Your results may vary.

James L Miller 12-21-2019 06:25 PM

Re: rod journal size vs rpm
 
How much power (or torque) can be run through the small journals? I bought a set of Crower rods with the Quad 4 bearing size. I would think the rear journal would take the most power (torque) through them, but only one cylinder is firing at a time.


All times are GMT -4. The time now is 03:03 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.