Ford 7.3 engine users?
Looking to start a discussion with Ford 7.3 gas owners and how they like the truck. My next truck will be pulling a 14-15K 5th wheel and will be a long bed crew cab. The 7.3 looks to be a really coo...
Forum Discussion
wnjj wrote:JRscooby wrote:
The only reason I can see for EB not to increase the whoa, would be stopping air from going in works nearly as well as stopping it from coming out.
It’s not just about stopping air movement. It’s all about PSI exerted on the pistons. The most a throttled engine can do is a perfect vacuum which puts < 15 psi against the back of the pistons. An exhaust brake can compress to more than 4x that psi so much more force on the pistons and more stopping power.
Think of the difference in energy required to run a vacuum cleaner versus an air compressor.
Finally, somebody talking logic/science instead of faith/advertising, but your vacuum cleaner/air compressor breaks down. The cleaner is more similar to a fan based air pump. Move suction hose to outlet to blow does not change power demand. And if you use a piston based pump to pull a vacuum in closed system (Evacuate AC system for example) will need same power as like sized compressor.
Thinking out loud; Now each cylinder with gas engine closed throttle, will resist rotation only on intake stroke, diesel, it will be exhaust stroke. The higher compression ratio of diesel will be of limited increase, because both engines will return most of that energy to crank when cross TDC to what would be power stroke.
Now if added exhaust brake to gas engine, you would in theory have whoa half time on each cylinder.
