Exhaust pulse is not back pressure, and back pressure is not exhaust pulse. Look it up.Back pressure is good 4 low rpm power.. Eg town driving
But 4 racecar like NASCAR they eliminate d back pressure.. Coz their cars aren't 4 town driving
I think the current engineering marvel is the Mazda Skyactiv engines, that comes with optimized exhaust header/manifolds. Very good low end torque for a naturally aspirated engine, maybe you can google it up and read more about it? Lots of papers on it.So is it possible to achieve good low end torque with a straight pipe and a straight flow muffler but with a standard exhaust diameter? least restricted setup. Or "back pressure" is required, thus using a S flow muffler but sacrificing high end powerband?
any engineers can explain? :D
Pulse is like a sync between the cylinders to work as a system. Too short the pipe at low rpm, you will lose scavenging which will lower the engine efficiency.'pulse' all managed at the header (manifold)...after that, its nothing...only to silence the noise and remove poisonous gas as far as possible...
Flow is volumetric rate lorh...I guess u mean flow and velocity? With a big straw, flow rate is higher but discharge at a lower pressure and vice versa. Bigger diameter, if the volume of air doesn't fill up the area of the pipe there is an expansion and it is bad if it is exhaust air because any expansion of air means lower pressure (the air itself) thus lower temperature hence lower energy to "move" or "travel".I think the current engineering marvel is the Mazda Skyactiv engines, that comes with optimized exhaust header/manifolds. Very good low end torque for a naturally aspirated engine, maybe you can google it up and read more about it? Lots of papers on it.
The easiest way to explain..is imagine your exhaust system is a straw
use a big straw, like those for bubble milk tea, and a small straw.. like McDonald's.
take a mouth full of water, and try to blow the water through the straw with full power, you will find that
1. with the big straw, the water will flow slower, i.e. shoot nearer but ALL the water release from your mouth very fast. in other words, the amount of time it takes for all the water to come out from your mouth is shorter
2. with the small straw, the water will flow faster, i.e. shoot further, but ALL the water in your mouth will release slower. In this case, the amount of time it takes for all the water to come out from your mouth is longer.
So 2 factors at play, flow & volume. you can say with small straw there's "backpressure" and with the big straw you lose "pulse or power". This is NOT a very accurate example, it is only meant to illustrate the difference between big & small exhaust diameter.
i was just about to say that haha..Its engineering not myth laa bro...
I know some of the guys feeling of maintaining 'back pressure & my car will accelerate like rocket'
That sounds like farting prettt preeett pruuuuhhhIts engineering not myth laa bro...
I know some of the guys feeling of maintaining 'back pressure & my car will accelerate like rocket'