Two stage pump engine requirment

[sly601]

What is the engine HP requirment for a 16 gpm two stage hydraulic pump for a log splitter and how do you come up with this value. I now use a 16 hp engine because that is what I had on hand. It burns alot of fuel, Is this overkill? What is optimum hp.
Thanks Sly601

 

[AKKAMAAN]

What is the engine HP requirment for a 16 gpm two stage hydraulic pump for a log splitter and how do you come up with this value. I now use a 16 hp engine because that is what I had on hand. It burns alot of fuel, Is this overkill? What is optimum hp.
Thanks Sly601

Rule of thumb is 16/2= 8hp...but the best is to calculate pressure by flow divided by 1714...on both low pressure/high flow and high pressure low flow....

Do you have the actual flow number for your pump plus the cut off pressure setting and the main relief valve setting??

Example
high flow 16gpm
low flow 4gpm
cut off pressure 700psi
main RV setting 2500psi

high flow calc hp= 16x700/1714=6.53hp
low flow calc hp = 4x2500/1714=5.83hp

Then you will need a 7 hp at minimum, I'd choose an 8hp

If you want to increase the cut off pressure to the max possible like 1100psi??
You will need more than 50% increase on power...11-12 hp...

Same thing with main RV....if you want to go with 3000psi you'll need 20% more power.....that could put you all the way up to a 14hp engine....now you have 16hp....

So go and get your numbers right....do your home work and tell us what and how you found it out....:thumbsup:

 

[glastron23]

Totally agree AKKAMAAN .. since you have the horse power you might as well use it, if the pump has the ability to turn up the low pressure/high volume side then turn it up, you will find that most of the wood that you split will be on the low psi side, so if you do this it will increase the speed of the splitter on the wood that requires a little more push with out having the pump going into the high pressure/low volume. it will be a little most efficient and be faster.. Jim

 

[J_J]

These are the specs for a 16 GPM hyd two stage pump. Some have already said you only need an 8 HP engine.

SPECIFICATIONS0.776 cu/in displacement low side
0.258 cu/in displacement high side
3000 PSI max
4000 RPM max
First stage 16 GPM @ 650 PSI
Second stage 4 GPM @ 2500 PSI
16 GPM @ 3600 RPM

The GPM are already set by the displacement of the pump and the engine rpm, and essentially you have 16 GPM in the low pressure mode, and 4 GPM in the high pressure mode. I don't think there is any change you can do to the pump to increase flow. 16 GPM is max, at 3600 rpm. There is no advantage in using a larger engine over the amount of HP required. and that is 8 HP.

The unloader adjustment can be set between 400 psi up to 900 psi. I believe it comes set at 650 psi. At the max unloader pressure, you will have the 16 GPM for a longer time, until the pressure builds up, and then the high pressure/low GPM will take over and slow down the splitting rate, but with higher pressure