V slot flow

Abstract

Exhaust pipe or exhaust stack 3 a extending vertical from the trucks diesel engine is modified with a slot to reduce back pressure. This pressure reduction enables the engine to operate more efficiently resulting in improved fuel economy.

1 . The V SLOT creates less back pressure in the exhaust stack. This is accomplish-by creating a suction and a low pressure in the exhaust stack. 
     
     
         2 . The suction of  claim 1  is created when the truck vehicle is traveling forward faster than the exhaust gases are flowing inside the exhaust stack prior to the V SLOT. The vehicle moving forward 60 mph exceeds the exhaust gases flowing 20 mph inside the exhaust stack. This excess air flow (40 mph) thru the V SLOT helps extract or suck the exhaust gases out. 
     
     
         3 . The low pressure of  claim 1  is created when the exhaust gases travel thru the narrowed exhaust stack. This narrowed portion is formed by the V SLOT at the inner apex of the exhaust stack's curve. This creates a low pressure (gases flowing thru) area in relation to the outside atmospheric pressure. (Bernoulli's Principle) This accelerates the exhaust gases reducing back pressure which contributes to better fuel economy.