I like Car Chemistry. They have baffles for headers and pipe . Plus they come with several diffrent tuning plugs to make quiter if you want. (Jegs , Summit) On pipes just drill a hole for the set screw slip it in and use set screw to hold it in place. Has an open header type sound. More discs equal less sound. Also check out some of the Roundy Round stuff. They have some that knock the sound down also
Thanks for the public service annocment think I will stick to the straight pipe I'm from nyc there are a lot worse things that they give ticket for there. still aint tired of it and its out the back anyway so the sounds behind me thanks again for everybodys comments
..... AND you can get muffler packing material to stuff between the discs to quiet things down even more. I like them too for some things.
i run just straight 32" pipes on my T bucket with a 400SBC & i put turndowns on the ends and beleive it or not it isn't that loud!! When i jump on it or smoke the tires it gets loud .But normal driving it isn't too bad. I removed the mufflers & installed K&N airfilters on it( 3 dueces) at the same time & it seems like it runs better to me. JimV
well tommy I see your concern here so I will be sure to finish off this story when I get home from the hunnert car pile up
Ed,I think with the mufflers on your o2 sensors will see more heat and they tend to work better hotter than not.Thats why the up stream o2s wide band ones have heaters and are real close to the engine. When you do decide to go with a flathead mufflers are always optional
I have straight pipes on my 34 P/U not a muffler to be found. I have no clue what MPGs it's getting and I don't really care very much. You gotta pay to play. As long as it runs good and looks good I'm happy.
one thing though, if your running straight pipes try & connect the 2 together.I haven't on mine yet & it gives a distinct" sperration" sound!! Not that Harley "potato, potato" sound jimv
thanks gary but i have to say its your fault i went to straight pipes and yes your right the o2 sensors have heaters and thats why its getting less gas mileage. time to put the mufflers back on and go for another ride this weekend to the hate show in endicott ny Oh tom yes 75 to 80 mph did get me alittle better gas milieage around 23 to 25 but the o2 sensors were probably colder and making it run fatter we will see
I see we're not done with the "backpressure" myth. How much backpressure is needed? None at all, none, not one, zero. Any backpressure is as useful as a potato jammed into the pipe. Most efficient exhaust in terms of mileage: 8" long open stub. Worst: internal baffle in a straight pipe.
Well the true test will be on saturday when I take a trip upstate for a show we will close this myth out on next sunday night for sure thanks
I'm trying to decide what kind of muffler set up to run, too. As much as I like straight headers with big and long exit pipes...I'm thinking about a 2 1/2" pipe inboard off the collector (which will have a 7" turn out with a block off plate for fun later) and run it along the frame and under the doors with a removable 18" end section at the rear, housing a removable homemade baffle and stuffing and a final turn out attached to this, exiting just in front of the rear tires....engine is a slightly warmed up 350 with 2-4's, t-400 and 3.00 gears, 30" diameter rear tires. Do you think my proposed set up will not make my wife want to buy a plane ticket home after we are on the road for a day or 3 on a long road trip? shes pretty kool for short runs and LOUD but think it might be different with the constant drone for longer periods, and I dont want to wreck her hearing or mine for that matter any more than it already is. We are both in our early 60's so preservation of what we've got is sort of important. The coupe body will be super insulated on all surfaces inside for noise and AC purposes. Wife likes her tunes. Whatdaya think...am I ok here? I'm at that stage where I gotta mock up stuff...dont mean to hijack this ...just have basically same concerns as the originator.... Thanks to all.
Two things any exhaust in front of the rear well make you deaf it should be all the way out back to make it quietier inside. And. 2 your not a smart *** I have ran the exhaust for 5 years with the mufflers off a harley on the back and got 26 mpg and the first time I switch to straight pipe I lose 5or 6 mpg. Sinistercoupe had a good idea maybe the o2 sensors are to cold because no back pressure at all and making it run fatter hence more fuel less mileage I will put the mufflers back on and try it sunday
There are equations involved in calculating for optimum exhaust runner tuning for proper cylinder scavenging and you need pipes if your going to tune anything correctly.....and, FYI, straight open stubs/zoomies on anything this side of injection or a blower is costing you big HP/efficiency and mileage. Besides, 8" is too short even for a Briggs on a Jr. Dragster what makes you think its going to work on a hot V8? Properly designed headers (with collectors) are the imperitive to building max efficiency on a carbed motor. All you need is the pipes. Mufflers are a necessary evil if you want to live with the car daily and/or keep the fuzz (or your old lady) off your ***. -Bigchief.
I put 16 baffles in my zoomies there still some what loud but really not that bad. I just got it running and put over 500+ miles on it. And where i live theres tons of cops and never been pulled over yet..With 425 hp i dont think the zoomies are hurting the hp
As a kid I used insulation out of the folk's attic to repack cycle mufflers all the time. The quieter the backyard 500 was, the more often it could happen I've always wondered what the difference was with the proper packing, like in terms of composition or manufacturing process. With insulation you could always see a glisteney bit of dust come out when revved hard, and the insulation would be noticeably reduced after a couple hundred hours.
If the engine doesn't have a big enough overlap triangle, tuned exhaust doesn't do anything. The next most effective thing is to kill all pumping loss, and avoid any waves that might arrive at the wrong time - 8" tunes above any engine speed you'll use, and is therefore neutral and harmless. The calculations that actually work are far, far more complex than anything you'll see on the web. Read Blair - if you've got $100. to buy the book.
The Jalopy Journal
