You mind supporting that statement with proof?
Is there such a thing as true dual?
- Thread starter RaptorHeaven
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You mind supporting that statement with proof?
Maybe he means that engines dont need it but, since all engines have back-pressure when a manifold is present we must try to limit it and make it work for us instead of against us?
Aidan
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It's fluid dynamics.
There is no way having a more restrictive exhaust system can help. You absolutely do not want something pushing back into the exhaust. As I mentioned before, this is normally confused with scavenging. You want the exhaust out of the cylinder as fast and as efficiently as possible, any sort of backpressure would inhibit that.
The confusion comes mostly from oversized exhaust systems, a larger diameter exhaust system reduces the amount of pressure drop in a system (good). However this frequently reduces the amount of low end torque a motor makes because the exhaust has slowed down. At slower RPM engine speeds, the effect of scavenging is much more apparent than at high speeds because there's less gas coming out so you need a little more help pushing/pulling it out of the chamber.
In order to explain what scavenging is, some basics: Obviously an engine has different cylinders and they all fire at different times, that means each one is exhausting at different times. Each time a cylinder exhausts some gas, there is a pulse of exhaust, a small pocket of higher pressure. Behind that moving pocket of higher pressure gases traveling out the pipe is another little pocket of low pressure. That's pretty familiar to any F1 or Nascar fans, they know the idea as drafting. You want to time your exhaust pulses the same way race cars draft behind each other.
I guess more to the point of the original question: No I do not have any testing to prove that. I'd love to see if someone has testing to prove me wrong too (I'm not talking headers v. no headers because that just helps prove scavenging. I mean more like a well designed header system v. a block off plate providing a massive pressure drop or very poorly designed headers). Like I said before, I think it's a wicked interesting subject and just hate when I see misinformation about it. I don't have laboratory testing to prove my claims but I've done research about it and everything fits with my knowledge of fluid dynamics. Feel free to call BS on me if you want though, I'm just trying to spread knowledge.
Wilson
FRF Addict
^^^^that is why I got my exhaust system love it tell me about drone is it because of the cats I'm getting the off road pipe to run at times and just to see if it help the drone I get at 65 mph
MTUH3
FRF Addict
I understand 6.2 point about a "true dual," and I used to think the same thing. Then I started talking to a few hot rod guys. If you run two pipes, one off each header back, even with a muffler, your truck will sound like two I4s competing against each other. The H-pipe or X pipe, or reason to connect the two is to balance out the sound.
I would guess that most OEMs from the factory connect both sides of the engine to 1 tube for packaging reasons. It is hard to run a pipe down the drivers side because of the fuel tank, filler pipes, evap can, and other goodies under there. Don't forget a spare tire hidden someplace too.
I would guess that most OEMs from the factory connect both sides of the engine to 1 tube for packaging reasons. It is hard to run a pipe down the drivers side because of the fuel tank, filler pipes, evap can, and other goodies under there. Don't forget a spare tire hidden someplace too.
Obviously you are extremely wrong about what your opinion of something is 6.2. And now for the remainder of the thread we will tell you why that is the wrong way to do things.
/sarcasm
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