running a cam w/o cats? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

camarohead · 03-18-2011, 05:57 AM

when getting a cam, will the exhaust smell get worse or stay the same? exhaust smell not to bad, but i do stink up the garage a little. wife does not like that. will the cam make it worse? might have to add some cats if it does.

Stealth 2010 2SS/RS · 03-18-2011, 01:56 PM

On my car before the cam the smell wasn't that bad, but after she well make your eyes water at idle. I dont know about while driving the snow is just starting to go away.

Alain · 03-18-2011, 05:38 PM

i don't have a cam yet but i do have high flow cats and long tube headers and the exhaust smell is pretty bad as it is.

mikeSS · 03-18-2011, 05:42 PM

ya i also could smell a little more with the cam. anybody know why cams do this? and what makes them not emission friendly ?

SGOS252382 · 03-18-2011, 06:24 PM

It's going to depend on the tune. It shouldn't be too much on an issue if the car is tuned properly.

camarohead · 03-18-2011, 07:57 PM

Quote:

Originally Posted by SGOS252382

It's going to depend on the tune. It shouldn't be too much on an issue if the car is tuned properly.

good to hear.

blake2010ss · 03-18-2011, 08:03 PM

mine definitely has some smell to it.

103FrazzL · 03-18-2011, 09:36 PM

Quote:

Originally Posted by mikeSS

ya i also could smell a little more with the cam. anybody know why cams do this? and what makes them not emission friendly ?

your getting more exhaust valve lift and its open for a longer duration
in the heads so more exhaust gas is coming out per engine rotation. same with the intake valve. kinda in lamins terms but thats prob. the reason for the stronger exhaust odor.

this is a great read http://www.popularhotrodding.com/eng...ecs/index.html

camarohead · 03-18-2011, 10:37 PM

Quote:

Originally Posted by 103FrazzL

your getting more exhaust valve lift and its open for a longer duration
in the heads so more exhaust gas is coming out per engine rotation. same with the intake valve. kinda in lamins terms but thats prob. the reason for the stronger exhaust odor.

this is a great read http://www.popularhotrodding.com/eng...ecs/index.html

great read, very informative.

mikeSS · 03-19-2011, 12:35 AM

Quote:

Originally Posted by 103FrazzL

your getting more exhaust valve lift and its open for a longer duration
in the heads so more exhaust gas is coming out per engine rotation. same with the intake valve. kinda in lamins terms but thats prob. the reason for the stronger exhaust odor.

this is a great read http://www.popularhotrodding.com/eng...ecs/index.html

thanks

greenmachinedriver · 03-19-2011, 10:59 PM

the more duration and overlap the worse the smell, when intake and exhaust valves are open at the same time some of the intake charge gets blown out the exhaust. with a good tune you will still get some fuel smell.

InvaderMoose · 03-20-2011, 12:23 AM

Wait, wait wait. I never heard about this, and planned getting a S/C Cam for my whipple.

If I'm driving normally, am I going to constantly be smelling exhaust? I never heard of a cam making it worse.

mikeSS · 03-20-2011, 12:48 AM

Quote:

Originally Posted by InvaderMoose

Wait, wait wait. I never heard about this, and planned getting a S/C Cam for my whipple.

If I'm driving normally, am I going to constantly be smelling exhaust? I never heard of a cam making it worse.

i dont think its driving when you smell it. it think its more when you start the car up

InvaderMoose · 03-20-2011, 01:38 AM

Quote:

Originally Posted by mikeSS

i dont think its driving when you smell it. it think its more when you start the car up

Oh, well that's good then. I love that smell.

03-18-2011, 05:57 AM	#1
camarohead Drives: 2010 ss rs ls3 red-white rallys Join Date: Oct 2008 Location: Mississippi Posts: 729	running a cam w/o cats? when getting a cam, will the exhaust smell get worse or stay the same? exhaust smell not to bad, but i do stink up the garage a little. wife does not like that. will the cam make it worse? might have to add some cats if it does. __________________ eps cam 226/234 lsa 113+2, bfe 1 7/8 headers, rotofab cai, katech oil pump, 444 rwhp, 411 rwtq, eps tune, Blanchard performance install

03-18-2011, 01:56 PM	#2
Stealth 2010 2SS/RS Drives: Black 2SS/RS M6 Join Date: Mar 2010 Location: Minnesota, Vadnais Heights Posts: 494 View My Garage	On my car before the cam the smell wasn't that bad, but after she well make your eyes water at idle. I dont know about while driving the snow is just starting to go away. __________________ 2010 LS3 2SS/RS M6 AirAid Cold Air Intake, AAC LED sidemarkers, AAC P13w plasmas drl, Kook's Custom 1-7/8" Headers, Corsa Hybrid Exhaust JRE 445 Cam Package, JRE SCT Tune, RX Catch Can and Breather Tech AFX Heater Hose Relocation Kit, Black Chrome Wheels Pfadt trailing and toe arms, Pfadt solid subframe mounts, Pfadt diff bushings, Street Slayer Twin Carbon Technostalgia Camaro LED taillights, CTS-V Front Brakes, Powder Coated Calipers By ME MGW Short Throw Shifter Complete ZL1 Rearend Swap Last edited by Stealth 2010 2SS/RS; 03-18-2011 at 02:36 PM.

03-18-2011, 08:03 PM	#7
blake2010ss Drives: 2010 Camaro 2ss/rs Join Date: Oct 2009 Location: stone mountain, GA Posts: 2,228	mine definitely has some smell to it. __________________ 2010 Camaro 2SS/RS LS3 1093/1066 416, AGP 6262, E85, Cam

03-20-2011, 12:23 AM	#12
InvaderMoose Drives: 2010 2SS/RS CGM Join Date: Apr 2010 Location: N/A Posts: 958	Wait, wait wait. I never heard about this, and planned getting a S/C Cam for my whipple. If I'm driving normally, am I going to constantly be smelling exhaust? I never heard of a cam making it worse. __________________ Engine/Appearance: 530 RWHP Whipple supercharger, Full JBA Exhaust, Ported TB, Cold Air Inductions & ADM Scoop /Complete new paint, 20" Forgestar F14s, Sinister hood, SLP Spoiler, AAC Halos, P13W Fogs

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03-18-2011, 05:38 PM	#3
Alain Drives: 2016 Challenger Hellcat, 2018 ZL1LE Join Date: Dec 2009 Location: Northern NJ Posts: 3,003	i don't have a cam yet but i do have high flow cats and long tube headers and the exhaust smell is pretty bad as it is.

03-18-2011, 05:42 PM	#4
mikeSS Drives: 2015 c7 Join Date: Nov 2009 Location: MI Posts: 7,462	ya i also could smell a little more with the cam. anybody know why cams do this? and what makes them not emission friendly ?

03-18-2011, 06:24 PM	#5
SGOS252382 Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008 Location: S.W. Florida Posts: 6,294	It's going to depend on the tune. It shouldn't be too much on an issue if the car is tuned properly.

03-19-2011, 10:59 PM	#11
greenmachinedriver Drives: white 2010 ss and 2011 6.2 silvy Join Date: Jan 2011 Location: dfw Posts: 316	the more duration and overlap the worse the smell, when intake and exhaust valves are open at the same time some of the intake charge gets blown out the exhaust. with a good tune you will still get some fuel smell.