log splitter hydralic question

[jockum]

OK, you all seem to know your stuff on hydraulics, I do not. Here is my question: I have an old brave industriies 28 ton splitter with a 4-1/2" cylinder(replaced about 5 years ago) , a 16 gpm barnes pump, 8 hp tecumseh cast iron cyl motor.I hate the motor because its loud, and I just hate tecumsehs in general. My thought was to replace the motor with a 6.5 hp from harbor freight, and replace the pump with a 13 gpm two stage.What I have been told is that the new setup will reduce the cycle time dramatically.I was also told that my existing pump is a two stage, but I wonder if it is or is malfunctioning, because I never see a decrease in speed, and I can stall the motor on the really knarly stuff or if my son just maxes the cylinder out. My objective to doing all of this is to reduce noise, reduce fuel consumption, and because I am bored. Any ideas will be appreciated

 

[J_J]

What you have selected will work, and it will be a little slower. If you install a hyd pressure gage on your current pump, you will see when the pressure changes between high and low. Low is about 650 psi, and high about 3000 psi.

1.84 sec difference between the 13 GPM and the 16 GPM pump, using a 24 in cyl.

That cycle time is not very dramatic

 

[AKKAMAAN]

here are the numbers you need....13gpm and 16gpm...

28ton is little optimistic...just short of 24tons at 3000psi.....

 

[kjung17]

Bwahaha. I love the spreadsheet guy.:laughing:

 

[jockum]

Thanks for the input guys, the manufacturer is the one who told me it was a 28 ton. Now, the next question: Would a 6.5 hp motor run my existing 16 gpm pump? (effeciently?)

 

[AKKAMAAN]

Thanks for the input guys, the manufacturer is the one who told me it was a 28 ton. Now, the next question: Would a 6.5 hp motor run my existing 16 gpm pump? (effeciently?)

yes, but you will have to reduce max pressure on both stages about 20%...so that will make it a "19ton" splitter...



Edit:
Back from work and my cellphone response earlier....sorry I was little to fast counting with out calculator in the car....right number shall be...

To run that 16gpm pump with a 6.5hp engine, high pressure need to be lower than 2750psi, and low pressure lower than 690psi...
That will put you just short of 22ton and 11.1 sec (6.2+4.9) cycle time at the best....

Edit2: Thats very common that they (manufacturer) give you some extra tons that you do not have to pay for.....LOL....90% of all log splitters are over rated on splitting force....actually fraud advertising in my opinion....