M8 Cams - Spreadsheet & PDF

[Ohio HD]

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.

[126Glide]

Thanks, very much appreciated!!

[joes124]

That was a time consuming endeavor!  Thanks

[Jmd897]

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

[rigidthumper]

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"

[EddieWolf]

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

[wfolarry]

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

You would have been better off. 

[Buglet]

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

[Durwood]

  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]

[Buglet]

  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.

[rigidthumper]

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

[les]

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

[Don D]

SE517 cam looks good to me.

[codyshop]

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

[swingarm]

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?

[Tail Ridr]

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

[hrdtail78]

A couple of Max-cell's.

Just found this post.   Thank you.

[Ohio HD]

I updated the sheet with three Star Racing M8 cams.

[FlightRisk86]

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

[wjcbsr]

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 :-(

[VernDiesel]

Anybody got CR 540 specs?

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

[rigidthumper]

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

[Ohio HD]

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

[sethjamto]

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

This cam can be had in the States.

[rigidthumper]

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

[NHBagger]

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

Loess Hills HD in Iowa just did a 107/485 combo. Believe they got the cam from A.P.E and ordered 10 more. Maybe they have info?

[Ohio HD]

There's also a CR483 Cycle Rama that looks to be only available in OZ. No specs to be found yet. 

[Ohio HD]

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

[Ohio HD]

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

[Ohio HD]

Uploaded a new cam list.

Added two Andrews cams, M8-465B and M8-485. Compliments of Rigidthumper.       

[Nick L]

Zippers Red Shift 472 Cam
Zippers has it listed as 23.5 Intake Close
It is listed here as 19.8 Intake Close

[rigidthumper]

I've seen it listed both ways
https://www.zippersperformance.com/wp-content/uploads/2020/06/M8-Red-Shift-Page-2020.pdf
https://www.zippersperformance.com/wp-content/uploads/2022/04/Red-Shift-M8-Specs-20220404-1-1024x1024.jpg

[Nick L]

After more looking I see the real early Zippers specs were listed at 053 now they list them at 050 didnt see that at first THANKS

[Sunny Jim]

I noticed Andrew's added two new cam specs to their list as per this publication. I don't seem to find them anywhere in the market place. Am I missing something here?

[rigidthumper]

I noticed Andrew's added two new cam specs to their list as per this publication. I don't seem to find them anywhere in the market place. Am I missing something here?

They were released at the NVP show a couple weeks ago. New item in the Mid USA, WPS, Drag Specialties, and other catalogs.

[dglide20]

I am looking for the specs on the cycle-rama CR485 and the CR483 if anyone has them...

[Mattls6]

I am looking for the specs on the cycle-rama CR485 and the CR483 if anyone has them...

No cam card was included with the CR483 I have sitting around, but I have partial specs for both handy:
483 = 214/260 duration, .483"/.480" lift, 21 degree IVC.
485 = 230/246 duration, .485" lift, 36 degree IVC, 25 degrees overlap.

[yobtaf103]

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

APE/CR485 36 ivc available US
APE/CR515 36 ivc (new high lift version 485) all else same events production a month out

[Ohio HD]

We've moved the M8 cams list to the link below. One interactive sheet for both Twin Cam and M8 cams.
Click for HTT Design Tools

[Sunny Jim]

We've moved the M8 cams list to the link below. One interactive sheet for both Twin Cam and M8 cams.
Click for HTT Design Tools

Are we likely to see more cam models added to this extensive list ? Eg. Wood 22XE

[Ohio HD]

Are we likely to see more cam models added to this extensive list ? Eg. Wood 22XE

If Bob Wood publishes the specs they can be added. I suspect that he's joining the crowd that doesn't supply cam specs to the public.

[HD/Wrench]

I can tell you that I have found several cams are not following the CCP vs cam specs . Just did a cam that was no specs deal . Showed 235 at 10.8 on calculated ..  real world 265  . Cam vendor could not supply supporting data on CCP .  even though 11.1 was stated to be fine .  Hard pass cam has to come out now.... I have been testing the 485&465B from Andrews nice results .

[Sunny Jim]

I can tell you that I have found several cams are not following the CCP vs cam specs . Just did a cam that was no specs deal . Showed 235 at 10.8 on calculated ..  real world 265  . Cam vendor could not supply supporting data on CCP .  even though 11.1 was stated to be fine .  Hard pass cam has to come out now.... I have been testing the 458&465B from Andrews nice results .
 

I have had a similar experience with a popular cam. Way more ccp than calculated on several engine displacement calculators.

[SpectrumWizard]

I'm new to the forum and not so familiar with who I am replying too, maybe everyone but oh well. I wanted to mention that on the M8 Cams listed for the STAR F35a information the IO is 10 BTDC but the calculator shows 0. The lobe lift shows 0.347 and should be 0.357 and the cam timing opens/closes @0.50. 

As well, the lobe lift on the 30/30 shows 0.294 in the calculator but his email says .303 lobe lift.

As well the information on the 3/4 and full race. Might be that the 0.53 for cam timing not being the 0.50 that George is saying is the issue.

I just received this from George Bryce a couple days ago. Don't know what it's worth but wanted to bring it out. I can follow up with Georges email if you need it. Thanks.

[Ohio HD]

I appreciate your effort to help with Star Racing cam specs, but here is why they read what they read.

Star doesn't publish their cam specs. And I respect George's prerogative to do that. That being said, this is a tech site, so we try to offer information that we have to others.

When there are zero values in the specs, it's because it's unknown. Unless there has been direct info from the manufacturer, we don't place a value.

Cam timing @ 0.050" or 0.053" will only change the values slightly. 0.053" is the HD standard since Tom Sifton started using it. That 0.003" lift difference doesn't change the timing more than a degree or two if that.

Cam lobe lift, that's calculated from the manufactures valve lift specification and the rocker arm ratio. Rocker arm ratio is not a certainty based on the info below.

SE cam specs are based on a theoretical rocker arm ratio of 1.65°.
S&S sells roller rocker arms and say they're a ratio of 1.64°.
Feuling says their cam specs are based on a rocker arm ratio of 1.61°.

So you see it's not certain. We use the HD estimated ratio of 1.65°.

Also please do not post a personal correspondence from George Bryce. I respect his privacy and I'm sure he doesn't intend it to be published on the open Internet.
 

[Ohio HD]

Another zero specs cam on the market. This one is from HPI, their JLR-478. I mean no specs, not even lift. 

https://www.horsepowerinc.net/m8-camshaft

[Tail Ridr]

At first I thought it might be a rebranded Dave Mackie 478, but I see it states a collaborative effort by T-Man

[biggzed]

That's beyond no spec. They don't even give a description of what to expect. LOL

Zach

Another zero specs cam on the market. This one is from HPI, their JLR-478. I mean no specs, not even lift. 

https://www.horsepowerinc.net/m8-camshaft

[biggzed]

CycleRama has replaced the CR480 with the CR480MT. I just bought one over the holiday. No specs were supplied with the cam. Not sure it is worth updating the sheet with the MT version or not.

Zach

[Ohio HD]

It's not, I'm not adding anymore no spec cams. It serves no use to anyone here.

[Ohio HD]

Well, we have a new cams comparator coming soon. I forgot that I had already added the CR480MT with all zero values. So it's in there, just nothing to see here.   

[itsafatboy]

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

andrew 485 , this cam repeats dyno numbers , 117" with 6.2 inj, 60mm throttle , getting 132/139 area multiple times , call and talk to steve at GMR performance , he only supports what tests out on dyno and these curves are nice a striate
last one was with a billet cat , but even with other pipes the cam just reproduces numbers   

[BilgeSnipe]

Found this for the Wood Performance WM-22XD

[BilgeSnipe]

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