mufflers

Mike Savelle · 07-29-2008, 07:25 PM

I just installed a set of mufflers on my stocker engine . Has anyone tried mufflers and if so what should I do with the timing and jets ? Richer or leaner or what . Any help would be greatly appreciated . Mike

Alan Roehrich · 07-29-2008, 07:37 PM

I have not tried mufflers on a stocker. I have tried them on various race engines. MOST any muffler that actually works as a muffler will present at least some restriction.

It depends on how much of a restriction the mufflers are compared to your open headers. The more of a restriction they (the mufflers) are, the leaner you'd need to be, compared to the open exhaust. Of course, that all depends on how close you were to ideal to begin with. It also depends on how well your headers were tuned to your combination to begin with. I'm not sure on timing. However, if the mufflers present any real restriction, they MAY contribute to left over exhaust contaminating the intake charge. That MIGHT require more timing. Again, it depends on how close to ideal you were to begin with.

THE LEGEND · 07-29-2008, 10:17 PM

I put a set of the IMCA mufflers on my crate motor stocker. It was .08 slower in the 1/8th mile.
Chip

Mike Savelle · 07-30-2008, 06:26 PM

Chip Did you change anything .? I haven't had the car to the track yet but it sounds lazy ???????? Mike

THE LEGEND · 07-30-2008, 09:50 PM

I used a self tapping sheet metal screw. I screwed them directly into the collector. I ran them a couple of races. I needed to move up on the sheet at a race and took them off I picked up .08 from previous pass.
These mufflers are cheap. I bought them from Speedway Motorsports, Around $50 for the pair. If car is tuned properly probably won't be any difference.
Chip

Bud Lefevre · 07-31-2008, 06:24 AM

I run Flowmaster 1 chamber race mufflers , didn't see any difference with or without them on the car. Installed an X pipe and picked up .2.
Does any stocker's run an X pipe on an open exhaust ?

07-29-2008, 07:25 PM	#1
Mike Savelle Member Join Date: Dec 2001 Location: Ontario Canada Posts: 369 Likes: 125 Liked 7 Times in 5 Posts	mufflers I just installed a set of mufflers on my stocker engine . Has anyone tried mufflers and if so what should I do with the timing and jets ? Richer or leaner or what . Any help would be greatly appreciated . Mike

07-29-2008, 07:37 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,103 Likes: 1,560 Liked 1,782 Times in 406 Posts	Re: mufflers I have not tried mufflers on a stocker. I have tried them on various race engines. MOST any muffler that actually works as a muffler will present at least some restriction. It depends on how much of a restriction the mufflers are compared to your open headers. The more of a restriction they (the mufflers) are, the leaner you'd need to be, compared to the open exhaust. Of course, that all depends on how close you were to ideal to begin with. It also depends on how well your headers were tuned to your combination to begin with. I'm not sure on timing. However, if the mufflers present any real restriction, they MAY contribute to left over exhaust contaminating the intake charge. That MIGHT require more timing. Again, it depends on how close to ideal you were to begin with. __________________ Alan Roehrich 212A G/S

07-29-2008, 10:17 PM	#3
THE LEGEND VIP Member Join Date: Aug 2002 Location: Fayetteville, n.c. Posts: 1,411 Likes: 0 Liked 1 Time in 1 Post	Re: mufflers I put a set of the IMCA mufflers on my crate motor stocker. It was .08 slower in the 1/8th mile. Chip

07-30-2008, 06:26 PM	#4
Mike Savelle Member Join Date: Dec 2001 Location: Ontario Canada Posts: 369 Likes: 125 Liked 7 Times in 5 Posts	Re: mufflers Chip Did you change anything .? I haven't had the car to the track yet but it sounds lazy ???????? Mike

07-30-2008, 09:50 PM	#5
THE LEGEND VIP Member Join Date: Aug 2002 Location: Fayetteville, n.c. Posts: 1,411 Likes: 0 Liked 1 Time in 1 Post	Re: mufflers I used a self tapping sheet metal screw. I screwed them directly into the collector. I ran them a couple of races. I needed to move up on the sheet at a race and took them off I picked up .08 from previous pass. These mufflers are cheap. I bought them from Speedway Motorsports, Around $50 for the pair. If car is tuned properly probably won't be any difference. Chip

07-31-2008, 06:24 AM	#6
Bud Lefevre Member Join Date: Mar 2002 Location: Toledo, Ohio Posts: 250 Likes: 0 Liked 0 Times in 0 Posts	Re: mufflers I run Flowmaster 1 chamber race mufflers , didn't see any difference with or without them on the car. Installed an X pipe and picked up .2. Does any stocker's run an X pipe on an open exhaust ? __________________ Bud Lefevre 3075 STK IHRA World Record Holder