On a race only car, where is the best place to put the mufflers? I plan on installing the bullet type race mufflers. Where would be best to put them, close to the collector or further back with an "X" pipe? Thanks
There's pretty much only one place they'll fit...in the back where the floor is recessed, right under the rear seat area. That's where I always put them. X pipe went just under the transmission extension housing then the pipes went back to the Mufflers. ....That is, when I used mufflers.
I think it was flowbastard that said you should have at least 18 inches of pipe in front and after their mufflers and the 40's fit our cars.. just dump it after the tires like a chebby or run tailpipes
unless your running sportsman class. then you need mufflers. mine are bolted right to the headers. yeah, they're loud.
funny with a properly built exhaust I'm a 1/4 second faster then open pipes.. consider the extra weight and the ability to listen to the radio I ran cherry bombs off the end of my headers while I got ready to build the exhaust nauseus and I had a headache for a couple of days beside with a fast bracket car they can't hear you coming >;0 http://www.popularhotrodding.com/enginemasters/articles/hardcore/0505em_exh/index.html learn something new >
Scooter, the same applied to the other engine I had in the car. Ran slower with open headers. Also running with an aircleaner made it run better. Disclaimer,(Just my meager experience with my car, may not apply to others.) LOL Some tracks are beginning to require mufflers and changing operating hours due to complaints from neighboring residents. Even though the strip was there when they built houses in the area, they sued and got the owner of the strip to change running hours.
Alot of tracks are requiring some kind of noise reduction device on the exhaust now, Jerry an idea may be some cones...put a 12 inch extension off the collector and slide the cones in and screw em down...they qualify as a noise reduction device....take up no space and are easily removed, I keep a set in the trailer now and my extensions are drilled for em....takes about five minutes to put em on...Summitt carries them...just a thought.
A classic error in judgement. Properly sized system with good components will work better than straight headers and an extension pipe. This has been proven time and again.
every internal combustion engine needs some amount of backpressure to perform effectively. some more or less than others, like sd said, properly tuned components make or break the performance. yea, shannon, thats 2 so far weve agreed on, hahaha, times they are a changin.:16suspect
of course. thats why all the pro stock & comp eliminator cars who need every hp run full exhausts instead of open headers. doesnt it have a lot to do with the engine setup, in particular fuel system & camshaft tuning? jmho
I'll argue with that. Pressure in the exhaust system does nothing but push the air/fuel mixture that is coming into the cylinder...pushes it back out the intake tract. Take a turbocharged engine for an example. They all have a lot of pressure in the exhaust system before the turbo. When exhaust pressure and intake pressure reach equilibrium, you will not make any more power. It's basically suffocating. Now, if you were to open up the exhaust system downstream of the turbocharger, which helps the expanding gasses flow out of both the turbo and the exhaust ports, you will have more power. THAT has been proven time & time again--and is one reason I had a full 3 1/2" exhaust on my old Mustang (2.3 turbo). Pressure in an exhaust system is your enemy. Using the resonance of the expanding gasses to help "pull" the gasses out of another cylinder is your friend. That is called scavenging and is the exact reason that headers will make more power than manifolds. If you look at a header collector, you'll see that all 4 primary pipes are right next to each other. As the gases from one pipe are exiting (at very high speed), they are creating a little bit of a "pull" on the pipes next to it. Then we get into merge collectors, extensions, mufflers, exh. system design, etc...but it all boils down to one thing. Pressure is your enemy! What would be the benefit of pressure in an exhaust system? Reason some people have issues with loss of power with too large of an exhaust system is because the expanding gasses have very little velocity, which creates very little pull on the rest of the system (no scavenging). There's more to it than that, but that's the nuts & bolts of it. Even on a 2 stroke engine...everyone says that the chamber causes pressure, which helps the charge into the engine. Nope! The chamber is a resonance box, so to speak. The shape of the chamber acts like an amplifier and due to it's shape, it will reflect a sound wave back toward the port, which helps push the excaping inlet charge back into the cylinder as the piston is approching TDC. Then we get into power valves, which change port timing which helps reflect some of the charge back into the cylinder at different times according to RPM....but that's another lesson for another day.
