Ecoboost engine question
With the Eco doing so well and loved by many and bragged about by Ford. Why is it not offered in the F250 ? I love mine but I'm curious.
Forum Discussion
Wes is does not matter if it's a race engine or street engine or carb or DI. A turbo/supercharged engine will always have a higher BSFC figure than a N/A engine.
The turbo, or belt drive supercharger (pump) needs power to turn the compressor blades or rotors. That power just does not come out of thin air. It comes from fuel burnt and this is why a supercharged engine will have a higher BSFC.
It has been erroneously stated many times, and sometimes in big publications that turbo's are "Free Horsepower." Nothing could be further from the truth. Pumps need energy to work and that energy comes from fuel.
It takes a lot of HP to turn pumps. Whether it's a water pump or an oil pump or an air pump. In the case of an ICE that power comes from fuel.
Now let me talk about DI engines and the way they function. There is a wide misconception that DI engines can't pre-ignite because they inject the fuel after TDC. This is just not the case for several reasons.
Without writing a big book about the subject this article explains it better than I can.
In short, a DI engine has 3 main modes:
#1. Ultra lean burn. (The DI engines see this mode VERY, VERY seldom. Going down a slight hill or during a medium to low speed at a steady speed are some times that an engine might this mode. The fuel is injected during the latter parts of the compression stroke)
#2. Stoichiometric mode. (In this mode the engine injects the fuel exactly the same "time" as an old bank to bank system; during the intake stroke. Nothing new here, same ol, same ol of yesteryear.)
#2. Full power mode. (Fuel is again injected during the intake stroke. The fuel curve goes to full rich mixture to prevent detonation.
For those that still want to debate the facts please answer this question. Why does Ford recommend premium fuel for the Ecoboost when towing? Why would they do that? After all, if the Ecoboost can't detonate why do we need premium fuel for it during heavy load and HP? The only reason to cut back timing or use premium is to prevent detonation.
Or this question: Why does Ford ecoboost have a detonation sensor if it can't detonate?
The turbo, or belt drive supercharger (pump) needs power to turn the compressor blades or rotors. That power just does not come out of thin air. It comes from fuel burnt and this is why a supercharged engine will have a higher BSFC.
It has been erroneously stated many times, and sometimes in big publications that turbo's are "Free Horsepower." Nothing could be further from the truth. Pumps need energy to work and that energy comes from fuel.
It takes a lot of HP to turn pumps. Whether it's a water pump or an oil pump or an air pump. In the case of an ICE that power comes from fuel.
Now let me talk about DI engines and the way they function. There is a wide misconception that DI engines can't pre-ignite because they inject the fuel after TDC. This is just not the case for several reasons.
Without writing a big book about the subject this article explains it better than I can.
In short, a DI engine has 3 main modes:
#1. Ultra lean burn. (The DI engines see this mode VERY, VERY seldom. Going down a slight hill or during a medium to low speed at a steady speed are some times that an engine might this mode. The fuel is injected during the latter parts of the compression stroke)
#2. Stoichiometric mode. (In this mode the engine injects the fuel exactly the same "time" as an old bank to bank system; during the intake stroke. Nothing new here, same ol, same ol of yesteryear.)
#2. Full power mode. (Fuel is again injected during the intake stroke. The fuel curve goes to full rich mixture to prevent detonation.
For those that still want to debate the facts please answer this question. Why does Ford recommend premium fuel for the Ecoboost when towing? Why would they do that? After all, if the Ecoboost can't detonate why do we need premium fuel for it during heavy load and HP? The only reason to cut back timing or use premium is to prevent detonation.
Or this question: Why does Ford ecoboost have a detonation sensor if it can't detonate?
