Banks Intake and exhaust system

timmac wrote:

Chum lee wrote:
Simple gasoline engine air/fuel stoichiometry says you need 14.7 lbs of air to 1 lb. of fuel. If you add more air, then you need to add more fuel or you will generate a lean condition which will raise exhaust gas temperatures and eventually cause engine damage. If you add more fuel than necessary, then you generate a rich condition which wastes fuel and reduces mileage. Engineers/chemists know this. I guess the rules of mathematics and chemistry don't apply to everyone else.

Chum lee

Yes that is true on the surface but more HP and Torque also means the motor works less to get up that big hill when we are talking about a 20,000 lb motorhome, so there can be gas savings in certain times with the Banks Power Pack System..

I don't understand the above statement. With a given gas engine (Banks modified or not) a given motorhome, and a given hill, it will take the same HP to go up the same hill at the same speed. If the Banks system squeezes out a few more HP in a given RPM range, to maintain constant speed, the driver will close the throttle to compensate for the increased HP at that RPM. Yes, no? A difference could possibly be that the engine now makes sufficient HP at a lower RPM to go up the given hill in the next higher (numerically lower) gear. That could save fuel due to lower RPM's, higher manifold pressure, and, less intake pumping loss. Yes, no? Fuel mileage is usually maximum at/close to the most economical driving speed which is usually just slightly above the point where the transmission shifts into its highest gear. But, for obvious practical reasons in a Class A gas MH, it's usually figured between 55 and 62 MPH. Above 62 MPH air resistance starts to increase drag substantially reducing MPG. Below 55 MPH, IMO is unsafe to drive on most major highways. Many people seem to get lost with the idea that MPG is never calculated at maximum power. Search BSFC: Brake Specific Fuel Consumption for more understanding. BSFC is the amount of fuel in lbs. that a specific engine burns at a specific power setting per hour per HP produced. It is very well understood by engine designers but not by the general public.

Chum lee