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Originally Posted by max8791 how much of power gain and FE will one can get after fitting 2 exhausts on 4 cylinder engine.
i.e. 1st exhaustpipe on cylinder 1 and 3 and
2nd pipe on 2 and 4 cylinder
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iam car dumb |
The horsepower/torque is not dependant on the number of pipes.
Basically depends on the combination of cam profile ,valve overlap and back pressure of exhaust system at different rpms.To define the entire mechanism would be very exhaustive. In short if you are looking for low end torque there should be slightly high back pressure so the valve overlap controlled by cam profile does not allow too much charge to escape. this would give a torquey feel at low rvs but you will lose out on top end at higher revs. If you are looking for torque at higher speeds then a slightly more free exhaust system would be recommended with a lower back pressure. But lowering back pressure to get high end can be done only to a certain extent, the cam profile which controls how much the valve opens and how long and at what degree also needs to be altered when dealing with exhaust gases. Other factors such as header design also need to be taken into considration depending on the firing order as they have to evacuate the gases from the cylinders by providing a slight amount of lower pressure to some extent during the exhaust stroke.
You can have 8 pipes if you want but if they dont provide the correct evacuation/back pressure they are of no use
All the team BHP motorheads plz feel free to correct me.
