Comp Cam Question
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From: Soddy Daisy TN
Comp Cam Question
Hey guys. I have installed a Comp Cam (CCA-08-300-8) in my L98. Is there a difference in the "Advertised" duration and actual duration of a camshaft? I just got the engine back in the car last night and have several other mods also so it will be a while before she's ready to crank. I was wondering what kind of idle I might have with this cam. Will it sound pretty much stock or maybe a little lopy? Here are the specs:
Roller Cam
Advertised duration: 262 intake/264 exhaust
Duration at 0.50 in. 206 intake/210 exhaust
Gross valve lift: .450 in. intake/.480 in. exhaust
Lobe seperation 112 degrees
Thanks guys, Troy
Roller Cam
Advertised duration: 262 intake/264 exhaust
Duration at 0.50 in. 206 intake/210 exhaust
Gross valve lift: .450 in. intake/.480 in. exhaust
Lobe seperation 112 degrees
Thanks guys, Troy
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From: Iowa BITES
The only real measurement you need to compare cams is @.050 lift at the valve with stock rocker ratio, usually 1.5 and overall valve lift. The cam you are using should give you some rumpety rumpety at idle but a properly tuned engine should respond to it very nicely. The cam we used is crane 214/222deg at .050 with .488"/.509" (intake/exhaust) , it has a very rumpety idle ,but with the mods (Edelbrock heads etc etc) it runs wicked scary fast. 
and the idle is a steady rumpeta rumpeta that shakes the car at 600rpm. 
and the idle is a steady rumpeta rumpeta that shakes the car at 600rpm.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
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From: Portland Oregon
Originally Posted by drumboytroy
Hey guys. I have installed a Comp Cam (CCA-08-300-8) in my L98. Is there a difference in the "Advertised" duration and actual duration of a camshaft? I just got the engine back in the car last night and have several other mods also so it will be a while before she's ready to crank. I was wondering what kind of idle I might have with this cam. Will it sound pretty much stock or maybe a little lopy? Here are the specs:
Roller Cam
Advertised duration: 262 intake/264 exhaust
Duration at 0.50 in. 206 intake/210 exhaust
Gross valve lift: .450 in. intake/.480 in. exhaust
Lobe seperation 112 degrees
Thanks guys, Troy
Roller Cam
Advertised duration: 262 intake/264 exhaust
Duration at 0.50 in. 206 intake/210 exhaust
Gross valve lift: .450 in. intake/.480 in. exhaust
Lobe seperation 112 degrees
Thanks guys, Troy
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Posts: 63
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From: Iowa BITES
In the past unscrupulous cam grinders would post "advertised" duration using different valve lift measurements, .001", .003" etc therefore the @.050 is used to compare cams today. If you would care to send me your current engine configuration I would be happy to run it across Desktop Dyno and give you a "reasonable" estimate of the power you will be making. 
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From: Soddy Daisy TN
Originally Posted by jeffie8696
In the past unscrupulous cam grinders would post "advertised" duration using different valve lift measurements, .001", .003" etc therefore the @.050 is used to compare cams today. If you would care to send me your current engine configuration I would be happy to run it across Desktop Dyno and give you a "reasonable" estimate of the power you will be making.
Here is what I've done so far.
1987 L98
Edelbrock Performer RPM heads: (60859)
Comp Roller Cam (CCA-08-300-8)
Roller Lifters, hydraulic
Summit Racing Roller Rockers: (1.5 ratio)
Edelbrock High-Flo T.P.I. base plate intake: (#3860)
Stock TPI runners, plenum, injectors, and throttle body: (48MM)
Accel HEI Super Coil on distributor
Hedman Ceramic Coated long tube headers: (H68446)
Straight dual exhausts
K&N Hi-Flo air filter with breather lid cut out
Air Foil in throttle body
Removed A.I.R. pump and components. Replaced with pulley
180 degree thermostat
Thanks a million man!!
Troy
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From: Soddy Daisy TN
Thanks bradvette. This cam was already in the engine when I bought it. This engine is to hold me over until I build my 383
stroker. Would the Lingefelter 211 be a cam to consider for that application?
stroker. Would the Lingefelter 211 be a cam to consider for that application?
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From: Iowa BITES
Troy I think I can use some of the info you gavebut you have a few variables that the program doesnt recognize so the results will be just ballpark. "Your results may vary". I do need a compression ratio and overbore if you have it. Jeff
Racer
Joined: Feb 2001
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From: Springboro OH
I have the next biggest Comp Cam, as I recall its 488 / 509 @0.50 and it has a little rumpty rump, I think its just right. If I remember correctly this cam has a slightly lower lift and slightly longer duration than the ZZ9 cam. The longer duration is why you get a little more lope and may also be a problem with Smog check. I have not had a real problem (either in AZ or NC) but its real close at idle.
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From: Soddy Daisy TN
In July of 2005 they will start emissions testing in all Tennessee counties. I will have to put the cat back on my car before then. I have straight duals right now and am considering 2 cats,....one for each side. Hopefully the cam won't be too much. From what I hear and read it's on the mild side. Thanks man.
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From: Iowa BITES
Yo sorry for the wait. Troy it looks like you have a nice combo. About 460 ft lbs @2000 holding to about 4000 then tapering off . Horsepower should be 350@4500 holding to 5500. Typical TPI power curves according to Desktop Dyno.I think you will like it. 
Burning Brakes
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From: Costa Mesa CA
And you can believe what JEFFIE has to say.
He was my Vette mechanic before he moved back to Backwater, USA. He ported my heads and base intake and I did the plenum work and added the 52mm TB. And for a light-cammed motor this thing is quite a ride and it passed CA smog with flying colors.
Jeffie's the man!
BTW, Desktop Dyno 2000 says 372HP at 4000 RPM and 445 ft.lbs. torque at 3500 RPM. I have a CompCam as well. Cam # is 501-8.
BIG JIM
He was my Vette mechanic before he moved back to Backwater, USA. He ported my heads and base intake and I did the plenum work and added the 52mm TB. And for a light-cammed motor this thing is quite a ride and it passed CA smog with flying colors.
Jeffie's the man!
BTW, Desktop Dyno 2000 says 372HP at 4000 RPM and 445 ft.lbs. torque at 3500 RPM. I have a CompCam as well. Cam # is 501-8.
BIG JIM
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From: Soddy Daisy TN
Hey Jeffie,
Sorry I didn't get back to you sooner. Iv'e been on vacation all week. The figures you gave me sound encouraging! It was actually what I was shooting for pretty much. I'm about to fire this baby up. I can't wait to see how she does. Thanks again for the info and I'll be in touch and let you know how things go. Have a great day man! Troy
Sorry I didn't get back to you sooner. Iv'e been on vacation all week. The figures you gave me sound encouraging! It was actually what I was shooting for pretty much. I'm about to fire this baby up. I can't wait to see how she does. Thanks again for the info and I'll be in touch and let you know how things go. Have a great day man! Troy
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From: Soddy Daisy TN
I've been there before man....it does suck. I hope you find something soon. Good luck and again thanks for the info. By the way, I cranked her up today for the first time and she sounds awsome dude. Sounds just like I hoped it would. Later man.