## Question: Which log splitter pump should I choose for my log splitter?

Answered with another question… (Sorry): What kind of splitter are you building?

The size of the cylinder determines the splitting force and speed, while the pump will affect speed, alone. The larger your cylinder bore, the more force it will exert, so it will split more, but it requires more fluid to fill it up which makes it slower.

The formula for hydraulic cylinder volume is:

**Pi X Radius ^{2} X Stroke**

So, a 4 X 24 would break down as follows: **3.14 X 2 ^{2}** (Radius = Bore divided by 2)

**X 24**(Stroke)

**= 301.44 In**

^{3}. 301 In^{3}= 1.3 Gallons.Therefore, a 4 X 24 will fully extend as follows (no logs):

- 11 GPM pump = ~7.1 seconds (1.3 g / 11 gpm X 60 seconds)
- 13 GPM pump = ~6.0 seconds (1.3 g / 13 gpm X 60 seconds)
- 16 GPM pump = ~4.9 seconds (1.3 g / 16 gpm X 60 seconds)
- 22 GPM pump = ~3.6 seconds (1.3 g / 16 gpm X 60 seconds)

Check out our **Log Splitter Speed Calculator Tool** to figure out how fast your log splitter would be.

Some smaller splitters will use a 3.5 X 24 2,500 PSI tie-rod cylinder and the 11 GPM pump. This would make a fast, small splitter. For a larger, heavy-duty splitter, a 5X24 welded cylinder would be commonly used, so you would want to choose a pump that would give you higher flow (16 to 28).

I hope this helps!

what rpm do I need to run the pump at?

what is the difference in 16 gpm 22 gpm? will they both split the same just the 22 will do it faster?

also I am going to use pulley system and electric motor to run the pump

any help would be great