Board index Flathead Power-Technical Questions, Answers, and Suggestions 45 Flatties Connecting Rod sideplay

Connecting Rod sideplay

Moderators: Curt!, Pa

Post Sat Apr 16, 2011 1:20 pm

Posts: 139
Location: USA
I need a little clarification about the female connecting rod side clearance
1.),my 45 service manual ,page 84,item # 8 indicates a .006 to .010 connecting rod side play between flywheels
2.)page 60 of the 45 service manual,item #2 and item #3 further support the.006 to .010 connecting rod side play specification between the female connecting rod and the flywheel.
3.)the 45 performance book by Victory on page 39 of 54 in the section under "Connecting Rods'' states,"The female rod needs .020-.025'' side clearance between the flywheel halves.
4.)Page 54 of 54 of the 45 performance book by Victory has a spec table wherein the female rod end-play between wheels is .015 -.020
With new wheels, rods and bearings I was able to slip a .019 feeler gage between my female rod and the flywheel which I suspect should be between .006 to .010,but I am puzzled about the information from the 45 performance booka and have so much confidence in the 45 performance book that I have doubts about the factory manual.What is the correct side play between the female rod and the flywheel?Thanks for the help. :D :D

Post Sat Apr 16, 2011 5:10 pm

Posts: 386
The factory manual has specs for stock as new assemblies. Most of the 45 performance info is geared towards hard use. it is common on race engines to use more clearance. Racers are not "run in" but put to hard use immediately. Panic has good info but H-D built a whole lot more engine than he has. Build it for its intended purpose. And a little extra won't hurt it by any means.

Post Sun Apr 17, 2011 8:13 pm

Posts: 1642
Location: Interlaken, NY USA

From what I've heard over the years, that's a non critical dimension, as long as you have the minimum. The rods tend to center themselves in use. Best use of that dimension is to check on taper condition if you don't have enough. I wouldn't pull them apart at .019"

Post Thu Apr 21, 2011 5:03 pm

Posts: 139
Location: USA
Thanks for your input guys ,after talking at length about this with my local boys the general consensus is that as you say,due to the rods essentially being self centering and the fact that I am running new bearings ,new crank pin ,new flywheels ,all set up for minimum specs its really a non issue. :D :D

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