HarleyTechTalk

Jamie posted some of the M8 cams from his web page a few days ago. Just adding to the information, a spreadsheet with some additional cams. The spreadsheet you can also easily compare one to another by the index number on the compared tab.

I also have a PDF file for those that don't use spreadsheets.

Just FYI, the few Feuling cams where I have them twice, and one row says "calculated", this is where the numbers didn't make sense, so I added the mathematical derivation from the timing. I've seen cams data listed like this before, but believe it to be an error because some of their cams the data is mathematically correct.


01/11/2020: Added Cycle Rama 470, 480, 530, Thanks Robin 
(duration, and lobe centers calculated)

01/21/2020: Added SE 517 cams,  Thanks Robin 
(duration, and lobe centers calculated)

10/17/2020: Added S&S 540C and S&S 590C

09/06/2022: I added the two Max-Cell cams that Jason had listed below some time back. I have been trying to find the specs on their M8 and TC cams, but none of the specs seem to be available. So I added what was known from below. At least if you used them you know how to configure for corrected compression, valve opening and TDC opening. Unfortunately this is all we have right now.  Thanks hrdtail78

12/15/2022: Added Ward Performance WP475, WP550, WP580 and WP610. The WP475 I have no specs for it.

12/15/2022: Added T-MAN M8-2652 and M8-3262.

01/29/2023: Added Andrews M8-465B and M8-485, thanks Rigidthumper.

02/03/2023: Corrected Zippers RS468 opening and closing values, thanks Rigidthumper.

Thanks, very much appreciated!!

That was a time consuming endeavor!  Thanks

Does anybody have the specs for TTS cams and the cyclerama 470/480 is not on this list though. 

Quote from: Jmd897 on January 11, 2020, 05:17:49 AM
Does anybody have the specs for TTS cams and the cyclerama 470/480 is not on this list though. 

CR470- 16/40, .470" | 60/14 .460"

CR480- 09/17, .480" | 52/18 .480"

CR530- 17/49, .530" | 60/12 .530"

wish I would have found this site and seen this before ordering my WM8-22X

Quote from: EddieWolf on January 21, 2020, 09:36:52 AM
wish I would have found this site and seen this before ordering my WM8-22X

You would have been better off. 

  Which cam would you go with for a 117 ST Heritage. Cam change with a 2 into 1 ex.

Quote from: BUGLET on January 21, 2020, 09:58:27 AM
  Which cam would you go with for a 117 ST Heritage. Cam change with a 2 into 1 ex.

I have tested a bunch of these bolt in cams and so far I like the CR-480 in a stage 2 application.
here's a 114" Softail I did recently.
[attach=0]

  What other cam would be good besides CR. I like to use a cam I deal with and CR is about the only cams I don't deal with, nothing against them but I deal with enough companies.

SE517- 25400353
Front   7/40, 62/7  .515/.513
Rear  -7/40, 61/5  .515/.513

This is the first time I've seen front/rear specs that are different on cams.  Can someone please educate me about this?

SE517 cam looks good to me.

I vacillated between Redshift 468 and S&S 475 and it came to a coin-toss.   In hindsight, I'm so glad the S&S 475 was heads.   Great cam for my 107, as it may be the most perfect cruising cam in the bunch.  HH

Quote from: les on June 04, 2020, 06:45:43 AM
This is the first time I've seen front/rear specs that are different on cams.  Can someone please educate me about this?

I think it has to do with the V-Twin firing interval.
1st piston fires.
2nd piston fires after 315° crank rotation
There is then a 405° crank rotation under no power
1st piston fires again and cycle continues... (315 + 405 = 720)
So a Harley V-twin has a 315° firing interval or 45 degree overlap in power stroke. That's what makes that nice lope.

Seems to me the leading or 1st cylinder needs more torque to get the mass moving as there is 405 degree of non power stroke rotation after the second piston fires until the leading piston fires again.  The 2nd trailing cylinder can best manifest HP to keep that mass moving because it fires after only 315 degrees of crank rotation after the first cylinder.  I think that is why the two different grinds.  One is better at producing torque and the other hp.  Just a thought?

Due to crank rotation, wouldn't the rear cylinder fire first?

A couple of Max-cell's.

Just found this post.   Thank you.

I updated the sheet with three Star Racing M8 cams.

Joined the site, just so I could see this chart.  It does not disappoint - Thanks!

I'm looking for the Cycle Rama CR-512 cam specs.  Can anyone help me?  I can't seem to find specs on this cam anywhere :-(

Anybody got CR 540 specs?

Any builder / dyno operators or owners that can compare & contrast the CR 540 to the Star 3/4?

Also BOLO for the CR485 (Aussie use only at the moment) specs.

I just came across this cam, but no specs. MHP-485 (Part Number: MHP-S485) at Moonshine HD. Designed by George Bryce.

Quote from: rigidthumper on November 10, 2022, 07:06:06 AMAlso BOLO for the CR485 (Aussie use only at the moment) specs.

This cam can be had in the States.

Got any specs & source? Last time I asked Wes, he said not available stateside?