Quote:
Originally Posted by Altocumulus Thanks kk.
I am basically looking at increasing sound and eventually in sometime I will get a FFE done though there are a lot of fellow BHPians in Kolkata who are saying that it wont be of any use in an Alto.
My question is if the exhaust pipe is too small or the muffler has a lot of air resistance wouldn't it take the engine more power to push the air out?
I am aware that a badly designed exhaust can reduce back pressure but will that really affect a small engine like Alto's ?
Also I am not changing the diameter of the pipe just clearing its path. So the engine should move a little more freely and also the cohesive force/attraction of the exhaust air should not be affected.
I maybe wrong but am just trying to understand how it will be a problem.
Thanks |
I am basically looking at increasing sound and eventually in sometime I will get a FFE done though there are a lot of fellow BHPians in Kolkata who are saying that it wont be of any use in an Alto. - If you plan to get a FFE done later on,why waste time playing around with the stock exhaust ?
As for your query,If you want to increase the sound, remove the Catcon, replace the muffler with one that is smaller in volume compared to the stock one. The universal ones that you see are mostly cylindrical and have straight through passage and have lesser volume compared to stock boxes.
Irrespective of which car or which engine it is, a redesigned exhaust tuned for performance,will definitely show you gains,doesn't matter whether its a 3 cylinder or 800cc engine.The noticeable difference would be lesser compared to let's say a 2L 4 cylinder or maybe a 3L V6 engine.that's all.
My question is if the exhaust pipe is too small or the muffler has a lot of air resistance wouldn't it take the engine more power to push the air out? - The manufacturer knows substantially more than end users like you and me. The exhaust plumbing is designed carefully and with a certain objective in mind. Keep in mind that the Alto wasn't made with performance in mind. The exhaust piping too is calculated.
If you increase the diameter of the pipes, alongwith a cat con delete and less restrictive muffler, the back pressure reduces and you will observe minute drop in low end torque but you will observe that at higher RPM the engine is much more happy.
The small dia of the plumbing and restrictive muffler will not put load on the engine,it will just not perform as freely as it would if there would have been no restrictions.
In the end, an engine is nothing but a very complex air pump. Everything depends on how efficiently the air comes in and goes out of the pump (engine).
You improve intake side by removing restrictions with polished ports,manifolds,larger throttle bodies,bigger intake kits and so on.Simultaneously you redesign the exhaust side as mentioned above and you see how much improvement you notice in the power and torque generated.