Ford's answers to the NHTSA 6.7 Investigation
There was a request for a link to Ford's answer's to the NHTSA investigation posted on a previous thread, since closed. Here is the link: Ford's NHTSA Answers to the 6.7 investigation This PDF i...
Forum Discussion
BenK wrote:NinerBikes wrote:4x4ord wrote:
Am I missing something NewsW? It's not going to take much oomph to move 2.5 gals of fuel per hour even if it is at 29000 psi. Less than 1 HP anyway.
A motor capable of making 240 HP is going to suck down more that 2.5 gallons per hour, just in pressurizing fuel and sending it back/bleeding it off to the fuel tank hot. Same for one capable of 400 HP like the Ford 6.7.
You have to understand the association with both GPH and PSI/BAR
Maybe you would understand a ICE with 7.5:1 compression ratio vs one
with 20:1 compression ratio, both with the same displacement
I think I see what I was missing. I know nothing about these pumps but I do understand how PSI and GPM go together to determine the HP necessary to drive the pump. I am gathering that the CP4 is not a variable displacement pump? So if it is set up to pump say 30 GPH at 3000 engine rpm it will pump that much fuel regardless of what the engine is burning. So the energy stored in the 20 or 25 GPH of fuel that is pumped up to pressure and not being injected into the cylinders is being released back to the fuel tank in the form of heat. So what News is getting at is the pump itself could be acting like a 15,000 BTU heater and if the fuel level is low, the fuel could be getting hot? Is the draw back of a variable displacement injection pump the cost of it?
