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Necoa #: 5
Location: San Antonio, Texas, after living in Hawaii for 31 years.
Joined: Apr 12, 2003
Posts: 612
Posted: Fri Nov 02, 2007 8:42 pm Post subject: Mufflers
Time for new mufflers. Just blew the baffles out of one of them with my new heads and cam. My question is:
Has anyone found a brand that does not resonate too much in the cab. A few years ago I tried some Flowmasters and the resonance was terrible. But I have heard that maybe the new 50 series weren't so bad. Any other brands that flow well but don't resonate too bad?
Thanks for any help.
Mike _________________ mygallary
Necoa #: 5673
Location: 2(CT,MA,ME,NH,RI,VT)
Joined: Jun 26, 2005
Posts: 851
Year: 1970
Model: El Camino
Posted: Sat Nov 03, 2007 7:42 am Post subject:
I have Flowmasters in both my 70 Elky and my 69 truck. Both vehicles have 454s with headers. In the Elky, they resonate, in the truck they don't. Go figure. I'm going to try stiffening the smuggler's box and closing up the opening to the cab. If that doesn't reduce it a whole lot, then I'm swapping mufflers at the next opportunity.
About a year ago one of the major car mags did a comparison of mufflers for flow rate and noise at cruise and WOT RPMs. Flowmasters, as I recall, were in the middle of the pack. Not the top (Gee. I guess advertizing really works). A friend used the info to select the muffs for his 65 Vette that was trying to exhale through restrictive 2" stockers. Lost the link to it. Maybe it's still out there in cyberspace somewhere.
Let us know what you select. _________________ 70 Elky (Non-SS) 454CID, TH700-R4
69 Chev C-10 Pickup (recently Upgraded to 454) w/TH400
29 Model A (Recently Sold).
I just finished a muffler test comaprison for Flowmaster 44, Hooker Aero Chambers, Magnaflow and DynoMax. All mufflers were 2 1/2", offset/offset, 4x9 ovals, 20" long. The best muffler for low in cab resonance is the DynoMax Ultraflow. The full report will be in this months magazine.
Click here
Necoa #: 10070
Location: 5(NC,SC)
Joined: Aug 29, 2007
Posts: 103
Year: 1981
Model: El Camino
Posted: Sat Nov 03, 2007 8:43 am Post subject:
I had a thought on resonance. The 5.0L Fox chassis Mustangs had two different length mufflers from the factory. I was told that this was done to reduce resonance. I am not sure how much truth there is to it. Has anyone tried something like this using aftermarket mufflers? _________________ Rhimmel
'81 El Camino
Necoa #: 10275
Location: 19(AK,ID,OR,WA)
Joined: Oct 01, 2007
Posts: 186
Year: 1969
Model: El Camino
Posted: Sat Nov 03, 2007 2:12 pm Post subject:
i laid my whole interior with sound deading adheasive b4 i put my new carpet in and b4 my mufflers where horrible inside, but now its like night and day! _________________ tim fraley
Have had dyna's before and flowmater 40's in my 69 BB. I changed to flowmaster Delta 40's and it is much better than either of the others, less of every thing just like they say. The 50's I here are to mellow for my taste. I have no sound products under my carpet and that is going in this holiday season, one layer dynamat and one layer of 1/8" or 1/4" dynaliner. I am doing this to better the tunes and the heat from the headers and in florida its hot enough so from what I have heard and been told those products work well. _________________ "69" SS 396/350 HP with a stock outside, stock underside, stock inside and a splash of chrome and polish in the engine area.
http://elcaminocentral.com/gallery-album_album488.html
I'm running 50's on my '87 with a LT1. If you step on it a little, you hear them - but, if you drive it normal (who can do that) there is just a little mellow/rumble. Which, sounds nice and kind of lets people know, it isn't all stock under there. .
Hey Don, Your link to that MCN, only lets you have a partial review of the mag, couldn't find your article. Or will it be in the Necoa mag? Your article on the Craftec cover was well written and informative. In fact, it was written so well that I almost bought a second one..... _________________ Mark
1972 Elky Picture Album
Mark,
The muffler test is in issue 9 which is still at the printers but should be out early next week. I don't know if it will be available on-line or if you'll need to buy the magazine. The on-line content is really just a teaser and seldom do they release the full article.
I just looked at the on-line issue, nothing on the muffler test (Exhausting work) but they do have the full cruise control installation available to read
On-Line copy
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