2 stage pump question

[polemidis]

Remember that a motorcycle engine produces that HP at a very high RPM and has little torque, comparatively speaking.

What kind of 16hp motor do you have?

DuroMax XP16HP 16 Hp., 1'' Shaft, Recoil Start Engine

About the unloader valve. I am looking for specs at least 12gpm@2000 psi, correct? Will this work? Or anyone from here

 

[muddstopper]

Have we switched to working on pressure washers.
I have no ideal how one of the pressure washer unloader valves would work in a hydraulic system. I have my doubts they will work for what you want them for.
My suggestion is to contact Sun Hydraulics and buy one of their manifolds and cartridge valves. Might cost $200 give or take a few million $$$$. Unloader valves work using pilot pressure to shift the spool. The right manifold will have internal pilot pressure sensing as well as a built in check valve and would be very simple to plumb in without a lot of extra fittings and hoses.

 

[polemidis]

It was the only unloadind valves I could find online. Thanks for the Sun Hydraulics resource. It looks they have it for only $700

 

[muddstopper]

$700!!! Me thinks you are looking at the wrong one. Call them, tell them what you want to do, A manifold should be $150+/- and a cartridge would be about $60-$70.
Hydraulic Two-Pump Hi-Low Unloading Valves | Flowfit
YRES | Solutions >> Two Pump High-Low Unloading | Sun Hydraulics

 

[CincyFlyer]

For example, my '77 two-stroke twin Yamaha RD400 put out something like 43HP @7100RPM in stock configuration. After extensive mods, it put out closer to 60HP @10,000RPM+. It could pull 11:92 @119MPH in a quarter mile. But I could hold it back and do burnouts with just a little bitty hand brake on a thin front tire and my feet on the ground. Plenty of HP, NO torque from a 400CC engine. My Kohler Comand Pro is something around 700CCs and only 25HP... but only runs at 3600RPM.

There's a reason many of these machines are powered by these 3600RPM air cooled engines.... they work. Keep it simple and use what's already been designed.

There's all the torque in the world, with the proper gearing. But you'd not want to run that engine as a mule on a fire wood processing line, to be sure! 40 years ago we ran Kawasaki H2s with extensive modifications to the engine. Ten seconds bikes, all day long. But in terms of engine life, hours.

 

[LD1]

There's all the torque in the world, with the proper gearing. But you'd not want to run that engine as a mule on a fire wood processing line, to be sure! 40 years ago we ran Kawasaki H2s with extensive modifications to the engine. Ten seconds bikes, all day long. But in terms of engine life, hours.

I was gonna leave the HP vs Torque discussion alone. Always seems to get heated.

But you are 100% correct.

You cannot change HP with gearing.
But you can have whatever torque you desire by changing gearing.

Horsepower is just the time element of torque.

 

[MossRoad]

There's all the torque in the world, with the proper gearing. But you'd not want to run that engine as a mule on a fire wood processing line, to be sure! 40 years ago we ran Kawasaki H2s with extensive modifications to the engine. Ten seconds bikes, all day long. But in terms of engine life, hours.

Do you mean H1? The two-stroke triples?