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12-18-2012, 12:14 PM
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#1
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Regular Member
Join Date: May 2010
Location: Northeast PA
Posts: 360
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Identifying what cam I have?
Hey guys.
For a while its been bothering me what kind of cam is in my car. I was told it's a comp cam, and it has comp cam rockers that I can see, but I have no clue about anything else as far as the cams concerned. All I know is my car only pulls 12 pounds of vacuum and has a pretty damn mellow idle. (Maybe the slightest bit choppier then stock) Lopes pretty good on a cold start though haha.
Is there any way to tell what's in there or at least the specs so I know what im working with, without pulling the whole motor apart? To access the timing cover is a lot more work on my car since the supercharger sits up there too...
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 1994 Pontiac Trans Am "Boosted Turd"
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12-18-2012, 12:34 PM
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#2
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Regular Member
Join Date: May 2010
Location: Northeast PA
Posts: 360
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I should also add it seems like the power peaks at 5400rpm according to the dyno... (The runs I did werent being tuned, I threw it on the dyno for 60 bucks just to get numbers)
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1994 Pontiac Trans Am "Boosted Turd"
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12-18-2012, 01:31 PM
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#3
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Regular Member
Join Date: Feb 2008
Location: Vancouver Isl., BC
Posts: 2,106
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only way to know for sure is a casting number
you could dial gauge lift and estimate duration just pulling a valve cover and making some degree marks on the crank hub while you turn it over, then compare it to some comp cams spec sheets.
some people say its hard with hyd. lifters, but i'd just take the rockers out of the way of the pushrod and leave it for a while so they bleed out and the pushrods aren't in lifter travel, should be pretty accurate
12 pounds of vacuum could be because of your supercharger running, even moving just slightly, vac readings would be lower. you'll have to unbelt it to get any meaningful vac. readings as they relate to your cam
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'97 z28 m6. built for DD torque. obd-i, lunati 262/270 cam, cc915, aluminum 1.5rr, mids, etc
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12-18-2012, 01:53 PM
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#4
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Regular Member
Join Date: May 2010
Location: Northeast PA
Posts: 360
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Never thought about unbelting it. I'll give that a shot.
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1994 Pontiac Trans Am "Boosted Turd"
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12-19-2012, 01:26 AM
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#5
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Regular Member
Join Date: Jul 2010
Location: New Mexico
Posts: 875
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http://www.strokerengine.com/CompCams.html
XR276HR 12" (inches) of mercury at 800rpm idle better known as cc503
Pounds are boost from turbo or supercharger.
The supercharger tames the idle somewhat and power peaks sooner than normally aspirated. Huffer makes it seem like larger cubic inches than it is.
The 503 with supercharger Sounds closer to this Lunati 60102 with normally aspirated.
This one also has a mild idle
This is a CC503 with a fairly smooth tune
cc503 tuned for nasty idle
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93 Z28 T-tops T56 6spd 3.23 Gears,
Mostly Stock.
Last edited by Viper; 12-19-2012 at 02:00 AM.
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12-19-2012, 08:58 AM
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#6
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Regular Member
Join Date: Apr 2010
Location: Western MA
Posts: 3,369
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Peaking out at 5400 RPM's isn't necessarily going to give you an idea of what cam is in there. You could be experiencing valve float, timing/fueling isssues, or a restriction somewhere. Like steveo mentioned the only real way to tell is numbers or measuring it.
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12-19-2012, 10:03 AM
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#7
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Regular Member
Join Date: Dec 2009
Location: Barberton OH
Posts: 641
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You can tell exactly what cam you have with a degree wheel and a dial gauge with a mount.
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Quote:
Originally Posted by CKJ
Hi-performance is so outdated.. everybody's doing it to where its not even cool anymore. I'm going for Prius MPG on a LTx  |
94 z28. Forged 383 12:1, Trickflow 205cc heads ported by TEA, LE 242/248, Viperized T56, Carbon Fiber Driveshaft, Moser 9'' with strange center section, 4.11 gear, Full UMI suspension, everything from the k-member to the sway bar links, 150 shot of N20, and lots of other crap
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12-19-2012, 10:06 AM
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#8
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Regular Member
Join Date: Dec 2009
Location: Barberton OH
Posts: 641
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I actually like to do it this way just because I find it more useful than a cam card. I put the information to a visual graph which allows me to see the overlap and the ramp of each lobe, and the amount of lift at a given degree.
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Quote:
Originally Posted by CKJ
Hi-performance is so outdated.. everybody's doing it to where its not even cool anymore. I'm going for Prius MPG on a LTx |
94 z28. Forged 383 12:1, Trickflow 205cc heads ported by TEA, LE 242/248, Viperized T56, Carbon Fiber Driveshaft, Moser 9'' with strange center section, 4.11 gear, Full UMI suspension, everything from the k-member to the sway bar links, 150 shot of N20, and lots of other crap
Last edited by MYLTWON; 12-19-2012 at 10:44 AM.
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12-19-2012, 11:52 AM
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#9
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Regular Member
Join Date: May 2010
Location: Northeast PA
Posts: 360
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Wow you guys are all being very helpful, thanks!
Viper- My cars idle literally sounds JUST like that second video you posted. Identical. I think you may have hit the nail on this head on this one. Nothings for sure until I actually dial-gauge it but if that site is true, my car runs around the same vacuum, peaks around the same area, and idles identical.
Mystery- Car definitely isn't experiencing valve float. It pulls really hard and smooth all the way past 5400 by quite a bit (which I don't do often because it's pointless) But timing/fuel could definitely be an issue. Because with the supercharger and IF IN FACT I do have a cc503 I should DEFINITELY be making more then 360 wheel. I've always thought my tune was off anyway. But im swapping my supercharger for a 60-1 turbo kit so im not going to pay to get it retuned until I get the other kit on.
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1994 Pontiac Trans Am "Boosted Turd"
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12-19-2012, 11:53 AM
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#10
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Regular Member
Join Date: May 2010
Location: Northeast PA
Posts: 360
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MyLTone- I have all that stuff to measure so while im doing the turbo swap im going to take a reading and see what I get.
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1994 Pontiac Trans Am "Boosted Turd"
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12-20-2012, 03:34 PM
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#12
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Whistles go Whoooooooooo
Join Date: Feb 2008
Posts: 15,493
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Quick google on a 60-1 turbo, thats tiny.
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12-20-2012, 09:31 PM
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#13
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Regular Member
Join Date: May 2010
Location: Northeast PA
Posts: 360
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it won't be bad for the setup I have. and I can always sell the turbo down the road for a different larger one.
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1994 Pontiac Trans Am "Boosted Turd"
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12-20-2012, 11:16 PM
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#14
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Whistles go Whoooooooooo
Join Date: Feb 2008
Posts: 15,493
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Quote:
Originally Posted by DMC4OOEX
it won't be bad for the setup I have. and I can always sell the turbo down the road for a different larger one.
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Not to derail, but, no tiny as in, spooling at idle and overspeed at like 5800 small. 
And as far as cam, I would just dyno tune it and forget what cam may or may not be in there for now.
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12-20-2012, 11:20 PM
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#15
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Regular Member
Join Date: May 2010
Location: Northeast PA
Posts: 360
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It's a complete Turbo technologies kit made for an LT1 haha. If I end up making 420whp I'll be happy. It may not be the biggest Turbo but it won't exactly choke out. I've seen smaller on our cars. it'll spool fast which is What I want and make more power.
plus the manifold can also be used for a T76 if I wanted to upgrade.
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1994 Pontiac Trans Am "Boosted Turd"
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