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Integral Cams ROCK!!!
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ideola  



Joined: 01 Oct 2004
Posts: 15509
Location: Woodstock IL

PostPosted: Sun Apr 20, 2008 12:58 am    Post subject: Integral Cams ROCK!!! Reply with quote

I ordered my cam from Steve @ Integral on Fri 04 Apr. After a brief discussion about my build, he confirmed that the Stage I for Turbo would be good for my project. Two weeks to the day the brand spanking new cam is on my doorstep. Now THAT's service! Thanks Steve!

Here's the pix:



Porsche 924 Stage I Turbo Cam
Seat duration*: 268° / 260°
.050" duration**: 232° / 225°
Gross cam lift: .500" / .478"
Hot valve lash: .015" / .015"
Net valve lift: .485" / .463"
* with .015" hot valve lash
** with zero valve lash

Lobe separation angle = 112°

At .015" hot lash:
Intake opens 22.0° BTDC
Full intake lift at 112° ATDC
Intake closes 66.0° ABDC

At .015" hot lash:
Exhaust opens 62.0° BBDC
Full exhaust lift at 112° BTDC
Exhaust closes 18.0° ATDC

Max. RPM = 6500 with stock valve springs at sotck installed heights with stock lifters

Intake : Outer Spring : Inner Spring : Total
Valve open : 50.5 lbf @ 1.667" : 11.5 lbf @ 1.555" : 62.0 lbf
Valve closed: 196.1 lbf @ 1.182" : 36.8 lbf @ 1.070" : 232.9 lbf

Exhaust : Outer Spring : Inner Spring : Total

Valve open : 50.5 lbf @ 1.667" : 11.5 lbf @ 1.555" : 62.0 lbf
Valve closed: 188.2 lbf @ 1.204" : 35.4 lbf @ 1.092" : 181.6 lbf

Set the initial cold valve lash at .011" intake / .011" exhaust. After the initial break-in period is over (see below), check the hot valve lash. Allow the motoro to cool down and then adjust the cold lash by your measured cold-to-hot delta so that the valve lash will grow to .015" when the engine is hot. It is the hot valve lash that really matters.

Break-in the new cam at 2000 RPM or slight higher for 20 minutes continuously after the motor is first started with the new cam.
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini


Last edited by ideola on Sat Jul 18, 2009 12:38 am; edited 1 time in total
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Chrenan  



Joined: 15 Jan 2003
Posts: 3901
Location: Canada

PostPosted: Sun Apr 20, 2008 11:29 am    Post subject: Reply with quote

Seems a shame to get oil all over that nice part.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11356
Location: PacNW

PostPosted: Sun Apr 20, 2008 11:52 am    Post subject: Reply with quote

Naw, makes it all slippery and glisteny. . .


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jazz guy  



Joined: 26 Nov 2002
Posts: 382
Location: Colorado

PostPosted: Sun Apr 20, 2008 2:40 pm    Post subject: Reply with quote

Rasta wrote:
Naw, makes it all slippery and glisteny. . .

Rasta I've read a couple of your latest posts, and I've come to the conclusion...(inhale)... that you're...(inhale)...feeling pretty good...(inhale)

But I gotta admit, I agree, that cam only gets better covered with oil.

Cheers, have a homebrew, Brian
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tuurbo  



Joined: 09 Aug 2007
Posts: 1463
Location: East Windsor, New Jersey

PostPosted: Sun Apr 20, 2008 2:50 pm    Post subject: Reply with quote

Ideola that's excellent - so will that sort of wind up and give you more power at higher RPM or how's it expected to behave? I haven't followed any threads you might have had.
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moone924  



Joined: 05 Feb 2003
Posts: 865
Location: Southwest Littleton Colorado

PostPosted: Sun Apr 20, 2008 5:15 pm    Post subject: Reply with quote

jazz guy wrote:


Cheers, have a homebrew, Brian


Homebrew is a good thing.... mead or beer it's all here...
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Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time.
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ideola  



Joined: 01 Oct 2004
Posts: 15509
Location: Woodstock IL

PostPosted: Sun Apr 20, 2008 10:10 pm    Post subject: Reply with quote

It was Roger's thread on Integral Cams that convinced me to go this route. Be sure to read all four pages...aside from a brief distraction on how to type in the ° symbol, the thread has a lot of good info specific to cam selection for forced induction. Excerpted from a quote in that thread:

Steve Greunwald @ Integral Cams wrote:
The improved stock cam is designed to be a modern design upgrade to the stock cam so it would be a good pick especially if you want the most low end torque. I would recommend grinding it with 112 lobe seperation. Generally, you want less overlap with a forced induction application because there is less blow through at TDC and you get a gain at every rpm. I think going to 114 lobe separation will probably be a little too much because the intake valve will close later and this will shift the power band up which isn't what you want.

As for winding up, the lightened solid lifters that are on order from Piper, along with the other valve-train lightening that will be performed during the head rebuild, should all combine for a very fast revving engine.
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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emoore924  



Joined: 13 Apr 2004
Posts: 2790

PostPosted: Mon Apr 21, 2008 1:59 pm    Post subject: Reply with quote

112? 114?

You'll have to tell us how it turns out...
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ideola  



Joined: 01 Oct 2004
Posts: 15509
Location: Woodstock IL

PostPosted: Mon Apr 21, 2008 2:47 pm    Post subject: Reply with quote

112 is standard on their stage I cam (see the specs in my original post).
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emoore924  



Joined: 13 Apr 2004
Posts: 2790

PostPosted: Tue Apr 22, 2008 1:21 pm    Post subject: Reply with quote

Are you going to use moly as a start up lube when you install it? What breakin instructions did they provide? Don't mean to take you to a bad place but recall the earlier discussions on oils and how the new formulations mess with flat tappet cam setups -- be sure you're running the right oil. It would be a terrible shame to lose that schweet looking thing in the first few hundred miles...
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RC  



Joined: 25 Mar 2007
Posts: 2624
Location: Australia

PostPosted: Tue Apr 22, 2008 9:49 pm    Post subject: Reply with quote

Judging by how mine is performing, I`m confident you`ll be very happy with it Dan. Have done over 5000 Ks on it now with no measurable wear. Rechecked clearances at around 500 miles and again recently with most requiring no adjustment, bar 1 or 2 that were initially 0.016". Since the stock type tapered screws moves 2 thou /turn, set it slightly loose rather than tight. Integral`s initial 11 thou cold clearance is spot on as it does grow to 15 when hot and the head expands.

I have only run NA with it and am impressed at the low and mid range torque developed, as well as improvement up top as well compared to stock. 7K is no problem at all and that is where the rev limit is now set after I was pulling 7.2 - 7.3 too easy and had good power there, on hills that would cause revs and power to drop if I changed up.

To be fair however, the cam was fitted at the same time as the EFI and I cant quantify the individual performance gains. With the restrictive CIS gone the increased flow has helped the top end and also the driveability in the low/mid area. Together the overall result is little short of amazing!

Notice your specs are the same on the exhaust with 7 deg and 0.022" lift more on the inlet. Should help you to jam a little more gas in the cylinder for some extra power. Keen to hear how yours goes Dan as you may get it running before I get my blower on since I am just too busy at the moment.

Would recommend using a molly cam lube on installation. Definitely wont hurt. Don`t turn it over much if you can help it before firing up and keep the revs up to move the oil, as per the instructions.

Roger
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ideola  



Joined: 01 Oct 2004
Posts: 15509
Location: Woodstock IL

PostPosted: Thu Apr 24, 2008 11:02 pm    Post subject: Reply with quote

emoore924 wrote:
What breakin instructions did they provide?

Eric, I posted the break-in instructions in the initial post of this thread...it's toward the bottom of the post underneath all of the specifications...
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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emoore924  



Joined: 13 Apr 2004
Posts: 2790

PostPosted: Fri Apr 25, 2008 2:05 pm    Post subject: Reply with quote

got it, thanks...
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friggin  



Joined: 30 Jul 2015
Posts: 39
Location: Montana

PostPosted: Sat Aug 22, 2015 2:30 pm    Post subject: Reply with quote

ideola would this be a good cam to use with ITBs that use bike carbs and eventually a supercharger? I'm very interested how this cam would work as a NA cam for a year or so before i could afford to supercharge my car.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11356
Location: PacNW

PostPosted: Sat Aug 22, 2015 3:26 pm    Post subject: Reply with quote



Ahhhhhhhh
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  • Shaggy (1980 931) - Got Boost?
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