gear junkie
New member
So the formula......gpm x pressure divided by 1100 to get engine size. Do gear reducers and belt drives change that formula?
So the formula......gpm x pressure divided by 1100 to get engine size. Do gear reducers and belt drives change that formula?
So the formula......gpm x pressure divided by 1100 to get engine size. Do gear reducers and belt drives change that formula?
why won't gears or pulleys change that? Riding a bike up the hill and you change gears? Is this right? What am I missing?First, forget that formula. That's unrealistic for a real world engine. A better formula is ([gpm X psi] / 1450) X 1.5.
Horsepower is horsepower. Belts, gears, and direct bolt ons won't change that.
Ok this one I can answer. The reason why is because pumps work off rpms to get the flow.....more rpms more flow. If both engines are running 3200 rpm, then the pump will produce the same flow as long as the engine is powerful enough to handle the pressure.No.
I have a spare t9281 with a great drive on it, I've hooked it up to a 9hp and a 13hp, psi and volume was spot on with both.
Hey Russ,..with formula...[gpm X psi] / 1450) X 1.5,...does the 1450 part change if the pump being used is a 1750 RPM pump? Would it be: [gpm X psi] / 1750) X 1.5?
Jeff
why won't gears or pulleys change that? Riding a bike up the hill and you change gears? Is this right? What am I missing?
First, forget that formula. That's unrealistic for a real world engine. A better formula is ([gpm X psi] / 1450) X 1.5.
Horsepower is horsepower. Belts, gears, and direct bolt ons won't change that.
Let's not forget, the pressure washer manufacturing industry has always adhered to a +/- 5% difference from advertised output.
95% of 3500 psi is 3325. 95% of 4 is 3.8. Plug these numbers in, and 13.07 is the magic number.
If you're running at 3,500 psi with a #4 nozzle, that is only 3.74 gpm.
First, forget that formula. That's unrealistic for a real world engine. A better formula is ([gpm X psi] / 1450) X 1.5.
Horsepower is horsepower. Belts, gears, and direct bolt ons won't change that.