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 Post subject: Re: Camshaft Discussion
PostPosted: Tue Nov 17, 2009 10:03 am 
Haha, I just built a W24 Octo-Turbo, now what?!
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Joined: Wed Jun 14, 2006 4:19 pm
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Location: Lethbridge, AB
Ugly Duck wrote:
RSI Stage 1 NA numbers are up. Observations: this camshaft isn't machined for a rear distributor, nor does it have the rear bearing oil groove machined into it like all the other cams do, but at least this one has the right base circle... It appears to be much closer to what RSI advertises: 252 degrees and 110 degrees LSA, with 11.07mm lift. I got 252 and 109, with 10.92mm lift.


Given the overlap, that's going to be one lumpy cam...good thing the K-Jet manifold is long enough to keep intake events isolated (fingers crossed) and I'm bolting up the Stahl header. I don't know how that would work with a stock exhaust and I don't know what the inside of the manifold looks like - but if it is at all sharing ports that would suck - literally. That's not as much lift as I was thinking it would have by the old eyeball method.

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 Post subject: Re: Camshaft Discussion
PostPosted: Tue Nov 17, 2009 10:40 am 
Haha, I just built a W24 Octo-Turbo, now what?!
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Joined: Wed Dec 21, 2005 8:40 pm
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Location: Calgary, Ab
The original manifold pairs 1&4, 2&3, but the lengths are all very short and are uneven. The manifold flows well but doesn't scavenge worth a damn, I imagine. The header should be a huge improvement... probably not quite worth what Stahl charges, but for what you paid it's a deal.

Update: I heard from Jonathan at RSI and he confirmed that there's a typo on the website, where it states the Stage 1 and Stage 2 turbo cams' durations were taken at .050" lift, and it's really supposed to be .020" lift. I'll have a look at my sheets tonight to confirm the numbers. RSI's website has been changed to reflect the info. Jonathan was also aware of the base circle problem on the Stage 2 cam, and has made arrangements to have it corrected in the next batch.

Now you see why you want to measure these things for yourself!!!


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 Post subject: Re: Camshaft Discussion
PostPosted: Wed Nov 18, 2009 6:50 am 
Strapping on extra booster rockets
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Good Job..

as the saying goes..measure twice cut once.

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 Post subject: Re: Camshaft Discussion
PostPosted: Wed Jan 13, 2010 12:59 pm 
Haha, I just built a W24 Octo-Turbo, now what?!
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Joined: Wed Dec 21, 2005 8:40 pm
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Location: Calgary, Ab
I planned on going somewhere with this, didn't I? My, how we get side tracked...


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 Post subject: Re: Camshaft Discussion
PostPosted: Tue Jun 22, 2010 10:16 pm 
Whost Pore

Joined: Sun Feb 11, 2007 7:26 pm
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so, has anyone seen any compiled information on relative torque peaks with each cam?


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 Post subject: Re: Camshaft Discussion
PostPosted: Thu Jun 24, 2010 7:34 am 
Haha, I just built a W24 Octo-Turbo, now what?!
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heheh, no... That would involve money, time, methodology, and effort on the part of the Volvo community. You can usually gather one or two of these things at a time, but rarely all four.

On Tbrix, Oregon Kyle (I forget his screen name) posted some dyno plots comparing a few of the cams, but I consider the information a little dubious. Take it for what it's worth.


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 Post subject: Re: Camshaft Discussion
PostPosted: Thu Jun 24, 2010 9:45 am 
Haha, I just built a W24 Octo-Turbo, now what?!
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Hmmm, how hard would it be to build an engine dyno - the Princess sells engine running stands now.

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 Post subject: Re: Camshaft Discussion
PostPosted: Thu Jun 24, 2010 10:10 am 
Haha, I just built a W24 Octo-Turbo, now what?!
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Location: Missing my garage in Sunnyside
hey craig, get your distributor unsiezed yet? all the cams, intakes and exhaust headers in the world won't help if you don't have spark control!!

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 Post subject: Re: Camshaft Discussion
PostPosted: Thu Jun 24, 2010 4:28 pm 
Whost Pore

Joined: Sun Feb 11, 2007 7:26 pm
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So how would you build the dynamometer part of it? The first part would be easy,... Hmmm.


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 Post subject: BUMP!
PostPosted: Tue Dec 27, 2011 7:14 pm 
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Joined: Tue Aug 07, 2007 9:36 am
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Oh, why hello friends!

So, I thought IADR/IanR had a cam chart for the OHC that mentioned the Volvo cams and some aftermarket cams and their durations at whatever duration they were listed at, but I can only find his OHV info right now(1800philes.com and http://www.brickboard.com/RWD/volvo/129 ... y_cam.html). I finally came across this thread though, and good find it is.

Cool thread and awesome work, Matt!

As Jonathan mentioned to you, his cams are measured at .020"/0.5mm, as are ENEM's advertised durations(not .040"). I don't know that I ever specifically asked Janne that, but it was positioned as such in whatever OHC valve chart that I've seen previously by IanR.

Here's the link to my gallery with all of my dyno charts in it. Not everything is directly comparable because there are ~4 different dynos used at various times, one of the dynojet dynos(with the B cam, specifically) that I suspected was reading low and costing ~20hp(confirmed later when a dragging brake was repaired). Then there's the variances in chip tuning(both ignition and AFRs, not all dyno charts have AFR info), cam timing, and of course the higher charts are after headwork/header/m47 swap, etc.

http://www.ovtuners.org/gallery2/v/memb ... ynocharts/

Right now I'm fighting with myself over what I want to do next. It really needs a larger camshaft to make the most of things, if I really want to make a lot of power. It will also need a larger header and I will eventually get around to modifying a b21F manifold for it's individual, longer(350mm, if I remember correctly, proper for 6500rpm hp peak), larger(flow enough for 240hp) runners. I may have a larger plenum built for the proper volume.

EDIT: Here is another company that I've spoken with recently about a possible camshaft. Their website shows the durations at various measurements, which I appreciated. There aren't any mentions of LSA though...

http://www.agap.se/

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 Post subject: Re: Camshaft Discussion
PostPosted: Tue Apr 29, 2014 11:40 am 
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Hey Matt, I got the cam information from Ian(IADR) about the OHC motors that I can forward to you, if you want to post it up here?

Here are a couple links to some recent discussions that I happened across about cams on TB, too, while I'm at it:
http://forums.turbobricks.com/showthread.php?t=294345
http://forums.turbobricks.com/showthread.php?t=293396
http://forums.turbobricks.com/showthread.php?t=294093

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 Post subject: Re: Camshaft Discussion
PostPosted: Fri Jan 01, 2016 11:23 am 
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Ugly Duck wrote:
M cam:
244/268 degrees at 0" valve lift
204/220 degrees at .050" lobe lift
.374"/.413" (9.50/10.49mm) lift from the lobe
112 degrees Lobe Separation Angle
32 degrees overlap at 0" lift
-12 degrees overlap at .050" lift (calculated)
-10 degrees overlap at .050" lift (actual)

T cam:
252/252 degrees at 0" valve lift
210/212 degrees at .050" lobe lift
.390"/.390" (9.90/9.90mm) lift from the lobe
110 degrees Lobe Separation Angle
32 degrees overlap at 0" lift
-9 degrees overlap at .050" lift (calculated)
-8 degrees overlap at .050" lift (actual)

V cam:
272/270 degrees at 0" valve lift
232/230 degrees at .050" lobe lift
.447"/.447" (11.35/11.35mm) lift from the lobe
111 degrees Lobe Separation Angle
49 degrees overlap at 0" lift
10 degrees overlap at .050" lift (calculated)
8 degrees overlap at .050" lift (actual)

A cam:
280/278 degrees at 0" valve lift
226/224 degrees at .050" lobe lift
.413"/.413" (10.49/10.49mm) lift from the lobe
109 degrees Lobe Separation Angle
61 degrees overlap at 0" lift
7 degrees overlap at .050" lift (calculated)
8 degrees overlap at .050" lift (actual)

B cam:
284/284 degrees at 0" valve lift
228/226 degrees at .050" lobe lift
.416"/.416" (10.57/10.57mm) lift from the lobe
108 degrees Lobe Separation Angle
68 degrees overlap at 0" lift
11 degrees overlap at .050" lift (calculated)
12 degrees overlap at .050" lift (actual)

D cam:
292/288 degrees at 0" valve lift
236/236 degrees at .050" lobe lift
.440"/.440" (11.18/11.18mm) lift from the lobe
112 degrees Lobe Separation Angle
66 degrees overlap at 0" lift
12 degrees overlap at .050" lift (calculated)
13 degrees overlap at .050" lift (actual)

K cam:
284/284 degrees at 0" valve lift
238/238 degrees at .050" lobe lift
.470"/.470" (11.94/11.94mm) lift from the lobe
112 degrees Lobe Separation Angle
60 degrees overlap at 0" lift
14 degrees overlap at .050" lift (calculated)
16 degrees overlap at .050" lift (actual)

Enem V15 Turbo:
290/286 degrees at 0" valve lift
226/224 degrees at .050" lobe lift
.468"/.467" (11.89/11.86mm) lift from the lobe
112 degrees Lobe Separation Angle
64 degrees overlap at 0" lift
1 degrees overlap at .050" lift (calculated)
2 degrees overlap at .050" lift (actual)

RSI Stage 1 Turbo:
276/296 degrees at 0" valve lift
224/254 degrees at .050" lobe lift
.410"/.462" (10.42/11.73mm) lift from the lobe
113 degrees Lobe Separation Angle
60 degrees overlap at 0" lift
13 degrees overlap at .050" lift (calculated)
14 degrees overlap at .050" lift (actual)

RSI Stage 2 Turbo:
274/296 degrees at 0" valve lift
232/254 degrees at .050" lobe lift
.446"/.462" (11.33/11.73mm) lift from the lobe
118 degrees Lobe Separation Angle
49 degrees overlap at 0" lift
7 degrees overlap at .050" lift (calculated)
8 degrees overlap at .050" lift (actual)

RSI Stage 1 NA:
298/294 degrees at 0" valve lift
252/252 degrees at .050" lobe lift
.430"/.430" (10.92/10.92mm) lift from the lobe
109 degrees Lobe Separation Angle
78 degrees overlap at 0" lift
36 degrees overlap at .050" lift (calculated)
34 degrees overlap at .050" lift (actual)


GREAT Work Mister Duck, I believe this is the only time someone has measured redblock cams and published the information. Unless someone has physically measured it, then it is fairly useless info. Kudos! Do you have any addition data meaused at various heights?

Also, does ANYONE know what the hot lash is on these? I would really apreciate this, because no one seems to know.


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 Post subject: Re: Camshaft Discussion
PostPosted: Mon Jan 04, 2016 1:01 pm 
Haha, I just built a W24 Octo-Turbo, now what?!
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Joined: Wed Dec 21, 2005 8:40 pm
Posts: 3477
Location: Calgary, Ab
Hi, Paul

I have height information written down for every degree or two of camshaft rotation. I just don't know where I've put this information... I even had to re-read this thread to remind myself how I measured things up, where and when I included lash numbers, etc.

Everywhere I've read, the hot lash is .002" greater than the cold lash. I always do them cold, it makes my fingers happier plus I don't worry about things cooling down during the process of setting them.


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 Post subject: Re: Camshaft Discussion
PostPosted: Mon Jan 06, 2020 6:03 pm 
Canadian Tire Bolt ons

Joined: Tue Aug 07, 2007 9:36 am
Posts: 29
Location: Portland, OR
More measuring:
http://forums.turbobricks.com/showthread.php?t=337956

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 Post subject: Re: Camshaft Discussion
PostPosted: Tue Jan 07, 2020 5:08 pm 
Haha, I just built a W24 Octo-Turbo, now what?!
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Joined: Wed Dec 21, 2005 8:40 pm
Posts: 3477
Location: Calgary, Ab
Thanks, Kyle


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