intake and muffler worth the mpgs??

[Daox]

When you're just cruising (low engine load) there really is no restriction since you are using such a small percentage of the power the engine is capable of providing. During acceleration (high engine load) is actually where your engine is being used most efficiently. Google brake specific fuel consumption for more info.

Bottom line is, intake and exhaust will do absolutely nothing to improve your mileage. It'll actually probably hurt it.

[northguest47]

Bottom line is, intake and exhaust will do absolutely nothing to improve your mileage. It'll actually probably hurt it.

Thanks for the BSFC info Daox, and, I respectfully disagree with the above statement. If one makes the airflow into and out of the motor more laminar then the motor would be more efficient making more horsepower at the same rpm, wouldn't this mean the car would accelerate to target speed using less fuel if it were compared to the same acceleration curve with a stock car? The cruising part makes sense for sure but what about during acceleration, and city driving having a lot of it?

Right off wikepedias entry on BSFC, "a reciprocating engine achieves maximum efficiency when the intake air is un-throttled", and it is proportional to fuel consumption rate, r

A corollary statement could be if you made the intake and exhaust smaller, say 1" or 1/2" are you saying that this won't affect mileage whatsoever? Thats really what I am interested in, because was thinking that some of the horsepower of the motor has to be used just to overcome friction losses in the system, so then it wouldn't be going to the axle, and it seems there is an efficiency loss there.