How to Measure Crankshaft Runout When Choosing a Harley Cam : Weekend Wrenching

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3 жыл бұрын

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Looking to add some horsepower to you trusty Harley? Well then a cam is probably in your future and one of the choices you will have to make if you have a Twin Cam or a Milwaukee Eight engine is whether or not to use gear drive or chain drive cams. One of the determining factors in making that decision is figuring out if your crankshaft is in spec enough to be able to use a set of gear drive cams. The process is pretty straight forward and since you will be taking your cam chest apart for the cam job you wont be doing any of the work twice.
#TwinCam #MilwaukeeEight #Cams

Пікірлер: 35

@Grunt49 3 жыл бұрын

Thank you! Harleys are not always well engineered,but they are always harleys!

@psychoticmemories2583 2 жыл бұрын

Harleys are engineered as bic lighters. How else do they sell the same 3 motorcycles over and over.

@paulwalker7202 Ай бұрын

this applies not only to gear drive cams, but to any billet cam plate. if total pinion runout is .005 or more DON'T use a high tolerance billet plate. my SE billet plate is now trash because the .009 total runout (.005 flywheel and .004 main bearing ) caused the oil pump to trash the surface of the cam PLATE. going back in now with s&s crank and tc3 plate/oil pump and gear drive cams. not cheap but hopefully it lasts

@MidnightExpressMC 2 жыл бұрын

Very concise tutorial covering all angles with great delivery. Also a superb illustration of how bean counters rule at H-D nowadays. Thank you, sir!

@opel1954 3 жыл бұрын

Great video, first time I knew about this procedure but now I know how to go about it. Thank you.

@dougfresh1341 3 жыл бұрын

Top quality vid and info. Appreciate your work.

@JokerTheVlad 2 жыл бұрын

So much free knowledge THANK YOU SIR!

@superplumber5 3 жыл бұрын

I feel lucky having .003 in both my twin cams 02 RK. 09 Dyna. The wobbling of the crank only gets worse with centrifical force and time. .006 is gonna wear out the oil pump a little faster.

@bigwu100 2 жыл бұрын

Another weak link.

@jigglestickdave 11 ай бұрын

Excellent video. Showed me exactly what I needed to know. 👍🏻

@BigFiveJack 2 жыл бұрын

So enlightening! Thank you!

@timwilsononline 2 жыл бұрын

Hey Patrick, firstly thanks so much for these videos - they're just incredibly well made and informative and I'm learning heaps. Keep up the great work! Q: (maybe an obvious question) Is crank runout the reason manufacturers use chain drive in the first place? e.g. because the chain / tensioner system providesa mechanism for absorbing that minute movement in the crank?

@jpcycles 2 жыл бұрын

Yes, I would assume that is why the manufactures use the chain drive set up. It would be cost prohibitive to build a more structurally sound bottom end and gear drive cam set up. So chain drive is what you get. Although gear drive is the superior way to go, chain drive systems on 95% of all hot rod street motors are going to work great. - Patrick

@bigwu100 2 жыл бұрын

Band-aid on an open wound. Chain drive is your friend. As is belt drive on your primary Slack not necessarily but looser tolerances absolutely.

@nathanschwartzengraber6854 2 жыл бұрын

So does this mean I shouldn’t put cams in my 103 if the runout is out of spec then? Or just gear drive, I thought mine was chain drive.

@jonkalm 4 ай бұрын

What is the process if you want that runout back down to below .003 ? New flywheel ?

@jerichobargas0311 2 жыл бұрын

What about " truing and welding" it, can u put in gears then?

@jpcycles 2 жыл бұрын

You could but in testing the welded crank pins aren't as strong as the S&S cranks.

@davidmatias6239 2 жыл бұрын

Can you still a cam if your run out is more than specified ?

@jpcycles 2 жыл бұрын

Yes, you just need to use a chain drive cam, not a gear drive cam.

@Kyle-ue5uj 3 жыл бұрын

So if you are over that number is it fixable?

@superplumber5 3 жыл бұрын

S&S or Darkhorse crank ....or send yours out to be balanced and trued.....no quick fix

@jpcycles 3 жыл бұрын

You have to replace the crank to fix it.

@allan9584able 3 жыл бұрын

This is not how S&S say to check , it the backlash on the gears and if not in limits you can get under or over sized gears

@jpcycles 3 жыл бұрын

This is not a video on checking backlash, its a video checking crank runout.

@allan9584able 3 жыл бұрын

Thanks for that , so Run out do not affect Backlash ???

@jpcycles 3 жыл бұрын

@@allan9584able runout does effect backlash. It is just measured differently.

@allan9584able 3 жыл бұрын

@@jpcycles less run out the better S&S limit is 5 thou

@jpcycles 3 жыл бұрын

@@allan9584able The S&S limit is 3 thousandths

@creigmacc 5 ай бұрын

So in other words, just use chain drive cams. HD

@vernegibb621 3 жыл бұрын

Damm shame hd put that junk in the m8 too. Guess they did not like 100000 miles engines evos rock.

@bigwu100 2 жыл бұрын

5000.00 price tag on stock Harley motor is ludicrous. I bet there is a whole bin behind the factory just stuffed full of junk engines to be recycled. Anyone work at Harley to verify?

@richardpitts6284 Жыл бұрын

No I didn't work for the factory , but have seen , pictures about 18 years ago , of a long , maybe 40 foot dumpster full to the top , of New engines . So if you bought a new one , and you had a lemon ! The engine would go back , then another was shipped , to the Dealership.