Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
Circle-D
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons


Reply
 
Thread Tools
Old 04-19-2013, 09:16 AM   #15
nyrfan
Let's go Rangers!
 
nyrfan's Avatar
 
Drives: 13' AGM 2SS/RS L99
Join Date: Jun 2011
Location: Orlando, FL
Posts: 10,696
Quote:
Originally Posted by RBL View Post
Read the Lobe Separation Angle and Overlap Changes part.
I guess my real question should have been, is it bad? And does the car tend to stall?
__________________
Soprano 4/1/00-6/14/11, Gone but NEVER forgotten!
FSP tuned: 377/389
nyrfan is offline   Reply With Quote
Old 04-19-2013, 09:34 AM   #16
SC2150
Account Suspended
 
Drives: 2012 Camaro RS, RX supercharged
Join Date: Dec 2009
Location: Bradenton, FL
Posts: 6,069
Excellent Chase! A very much misunderstood component, and far to many are NOT matched to the build or the goals of the customer. The 2 biggest subjects I see misinformation on are:

1. NA cam that is also best for FI. No such cam grind exist's.....all will run, but the type FI requires the proper profile to optimize power, and:

2. "I want a lopey/lumpy idle" This we battled for ages with carburated big cam builds.....this is why we have to idle the drag engines at 1000-1200 RPM to get a signal to the carb. This may sound cool, but it is not the most efficient or optimized for power...expecially off idle. Comp introduced their "Thumper" line due to demand for the sound, not optimal performance.

SC2150 is offline   Reply With Quote
Old 04-19-2013, 09:45 AM   #17
nyrfan
Let's go Rangers!
 
nyrfan's Avatar
 
Drives: 13' AGM 2SS/RS L99
Join Date: Jun 2011
Location: Orlando, FL
Posts: 10,696
Quote:
Originally Posted by SC2150 View Post
Excellent Chase! A very much misunderstood component, and far to many are NOT matched to the build or the goals of the customer. The 2 biggest subjects I see misinformation on are:

1. NA cam that is also best for FI. No such cam grind exist's.....all will run, but the type FI requires the proper profile to optimize power, and:

2. "I want a lopey/lumpy idle" This we battled for ages with carburated big cam builds.....this is why we have to idle the drag engines at 1000-1200 RPM to get a signal to the carb. This may sound cool, but it is not the most efficient or optimized for power...expecially off idle. Comp introduced their "Thumper" line due to demand for the sound, not optimal performance.

I am very confused by this whole cam thing. So can one be done that give you a nice sound, but does not sound like it is ready to stall? Is there a happy medium?

Again sorry if these are dumb questions, but I am really confused by this.
__________________
Soprano 4/1/00-6/14/11, Gone but NEVER forgotten!
FSP tuned: 377/389
nyrfan is offline   Reply With Quote
Old 04-19-2013, 11:11 AM   #18
Tyler360
 
Tyler360's Avatar
 
Drives: 2011 Camaro 2SS/RS
Join Date: Jul 2011
Location: Wittenberg, Wisconsin
Posts: 701
Very informative! Didn't know much about cams till I read this!
__________________
Tyler360 is offline   Reply With Quote
Old 04-19-2013, 01:14 PM   #19
Stitch
 
Stitch's Avatar
 
Drives: SS, CTS & SRT-4
Join Date: Aug 2009
Location: Pittsburgh
Posts: 426
Very clearly explained.

Thanks Chase!
__________________
Stitch is offline   Reply With Quote
Old 05-29-2013, 09:04 PM   #20
Apex Motorsports
 
Apex Motorsports's Avatar
 
Drives: 2000 Camaro SS
Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,211
I am glad that you guys are finding this thread helpful.

Quote:
Originally Posted by nyrfan View Post
I am very confused by this whole cam thing. So can one be done that give you a nice sound, but does not sound like it is ready to stall? Is there a happy medium?

Again sorry if these are dumb questions, but I am really confused by this.
You can buy an "off the shelf" cam or you can custom spec a cam to accomplish any goal you like. Be it performance, sound, or some combination of the two.
Apex Motorsports is offline   Reply With Quote
Old 06-07-2013, 03:28 AM   #21
Bonemaro

 
Bonemaro's Avatar
 
Drives: 2010 RJT 1SS M6
Join Date: Jul 2009
Location: Ann Arbor, Mi.
Posts: 1,692
Send a message via AIM to Bonemaro
Quote:
Originally Posted by nyrfan View Post
I am very confused by this whole cam thing. So can one be done that give you a nice sound, but does not sound like it is ready to stall? Is there a happy medium?

Again sorry if these are dumb questions, but I am really confused by this.
I found these numbers to be a happy medium- (LS3)
227/239 .613 .623 LSA 114

Sounds great/makes good power
Bonemaro is offline   Reply With Quote
Old 06-07-2013, 08:35 AM   #22
DrkPhx

 
DrkPhx's Avatar
 
Drives: 2013 Triple Black ZL1 / 2006 TB SS
Join Date: Feb 2011
Location: St Michael, MN
Posts: 1,633
Quote:
I am very confused by this whole cam thing. So can one be done that give you a nice sound, but does not sound like it is ready to stall? Is there a happy medium?

Again sorry if these are dumb questions, but I am really confused by this.
The more you read about cams, the more you can get confused; but you have to look at it from a valve timing event perspective, then it becomes easier to decipher and digest all of the information out their. While all aspects of cam design play into cam performance the two key events are intake valve closing point (most important) and exhaust valve opening. But don't take my word for it; read on.

Comp Cams has some good articles on camshafts.

http://www.compcams.com/Pages/413/ca...ion-angle.aspx

http://www.compcams.com/Pages/416/va...-tutorial.aspx

Other artcles:

http://www.popularhotrodding.com/tec...s/viewall.html

http://www.chevyhiperformance.com/te...engine_basics/
DrkPhx is offline   Reply With Quote
Old 06-07-2013, 09:56 AM   #23
CGT
 
Drives: 2011 SSm6
Join Date: Oct 2011
Location: St.Louis
Posts: 279
Quote:
Originally Posted by DrkPhx View Post
The more you read about cams, the more you can get confused; but you have to look at it from a valve timing event perspective, then it becomes easier to decipher and digest all of the information out their. While all aspects of cam design play into cam performance the two key events are intake valve closing point (most important) and exhaust valve opening. But don't take my word for it; read on.

Comp Cams has some good articles on camshafts.

http://www.compcams.com/Pages/413/ca...ion-angle.aspx

http://www.compcams.com/Pages/416/va...-tutorial.aspx

Other artcles:

http://www.popularhotrodding.com/tec...s/viewall.html

http://www.chevyhiperformance.com/te...engine_basics/
Yes, the IVC seems to be the dominant valve event, usually followed by EVO. At least in the testing I've done.
CGT is offline   Reply With Quote
Old 06-28-2013, 04:10 PM   #24
MikeMoach

 
MikeMoach's Avatar
 
Drives: 2010 RJT 2SS/RS
Join Date: May 2012
Location: Staten Island, NY
Posts: 1,354
So if I got this right, I gotta get all the supporting mods first and with that info I can spec out what cam would be right for my car correct?
MikeMoach is offline   Reply With Quote
Old 06-28-2013, 05:12 PM   #25
Apex Motorsports
 
Apex Motorsports's Avatar
 
Drives: 2000 Camaro SS
Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,211
Quote:
Originally Posted by MikeMoach View Post
So if I got this right, I gotta get all the supporting mods first and with that info I can spec out what cam would be right for my car correct?
To maximize your results, yes.
Apex Motorsports is offline   Reply With Quote
Old 06-28-2013, 05:44 PM   #26
MikeMoach

 
MikeMoach's Avatar
 
Drives: 2010 RJT 2SS/RS
Join Date: May 2012
Location: Staten Island, NY
Posts: 1,354
Quote:
Originally Posted by Apex Chase View Post
To maximize your results, yes.
Ok but I feel lost, doesn't the size of the lifters depend on the size of the cam?
MikeMoach is offline   Reply With Quote
Old 06-28-2013, 07:15 PM   #27
gotroost

 
gotroost's Avatar
 
Drives: IOM 2SS RS
Join Date: Oct 2009
Location: Sierra Vista, AZ
Posts: 876
I think Chase should start one of those Sunday morning car shows. Nice to be able to learn something instead of watching a half hour of product plugs.
__________________

Mods: JRE 470 cam kit, Dynatech long tubes/hi-flo cats, SLP underdrive pulley, CAI intake/ADM scoop, Pfadt Stage 2 suspension, Hotchkiss strut tower brace, Proven Wicked tow hook and end links, DBA rotors, Melling oil pump, Katech timing chain/LS2 damper, some bloody knuckles, still in progress...
gotroost is offline   Reply With Quote
Old 06-28-2013, 10:05 PM   #28
CAP'N B
Cajun Mariner
 
CAP'N B's Avatar
 
Drives: 10 Camaro SS/RS RJT 99 Silverado
Join Date: Mar 2010
Location: Real Cajun,Golden Meadow, LA.
Posts: 608
Send a message via Yahoo to CAP'N B
Quote:
Originally Posted by MikeMoach View Post
Ok but I feel lost, doesn't the size of the lifters depend on the size of the cam?
No, the lifter size is determined by the hole in the block that they fit in.
The pushrod length changes sometimes, depending on the cup where the bottom of the pushrod sits in the lifter is. I think a LS7 lifter is taller.

The rocker arm ratio can change the dynamic of the valve events. A 1.8:1 rocker ratio will increase lift and duration.

The engine seems to want to stall at times because the valves are open at the same time, bleeding off compression, or cylinder pressure. At higher RPM this happens too fast to make a big difference. So the engine runs smooth.

Some cams have a few degrees of advance built into them this lowers where the Power will be made in RPM's.this is called the power band.

Now lets confuse them some more. On the automatic cars with the L99 engine we have what is called Variable Valve Timing cams, this automatically advances and retards the cam. It will have both , low end power and upper end power.
__________________
'10 Camaro 2SS/RS Red Jewel L99/A6
'15Camaro Z/28 Ashen Gray

CAP'N B is offline   Reply With Quote
 
Reply

Tags
apex motorsports, cam, camaro cam specs

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:50 AM.


Powered by vBulletin® Version 3.8.9 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.