Exhaust Note and Cam Duration
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Exhaust Note and Cam Duration
I've got a 224/218 cam on a 114 lsa that sounds down right MEAN when its idling. I'm running a turbo with strait pipes out the back. I've only had the engine on the dyno, but before I put it back in the car my dyno curve says that i should add some more exhaust lobe into the cam to increase the top end powerband.
My problem is that I really don't want to loose that really mean sounding idle. I'd be willing to give up a few HP for it anyways. It has a pop to it almost that I think is from the small exhaust durration. If I bump the exuast lobe up to 224 do you guys think that it would really mess with the exhaust note??
Lets hear some theories....
My problem is that I really don't want to loose that really mean sounding idle. I'd be willing to give up a few HP for it anyways. It has a pop to it almost that I think is from the small exhaust durration. If I bump the exuast lobe up to 224 do you guys think that it would really mess with the exhaust note??
Lets hear some theories....
Instructor
Joined: Mar 2002
Posts: 239
Likes: 0
From: Fredericksburg VA
How does it sound now? The crackle is more from early exhaust valve opening, and the lope is more from overlap.
Also, how do you have that cam installed? I.e. what is the Intake Lobe Centerline Angle? What leads you to believe that you need more exhaust lobe? I am just interested to know your thoughts on this.
Also, how do you have that cam installed? I.e. what is the Intake Lobe Centerline Angle? What leads you to believe that you need more exhaust lobe? I am just interested to know your thoughts on this.
Drifting
Joined: Jun 2005
Posts: 1,824
Likes: 1
From: Middleboro Massachusetts
Originally Posted by mn_vette
I've got a 224/218 cam on a 114 lsa that sounds down right MEAN when its idling. I'm running a turbo with strait pipes out the back. I've only had the engine on the dyno, but before I put it back in the car my dyno curve says that i should add some more exhaust lobe into the cam to increase the top end powerband.
My problem is that I really don't want to loose that really mean sounding idle. I'd be willing to give up a few HP for it anyways. It has a pop to it almost that I think is from the small exhaust durration. If I bump the exuast lobe up to 224 do you guys think that it would really mess with the exhaust note??
Lets hear some theories....
My problem is that I really don't want to loose that really mean sounding idle. I'd be willing to give up a few HP for it anyways. It has a pop to it almost that I think is from the small exhaust durration. If I bump the exuast lobe up to 224 do you guys think that it would really mess with the exhaust note??
Lets hear some theories....
Click on any G5X3 114 lsa cam and hear the idle.
