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Most Log splitters using small engines as a power source will use a two stage pump. Using low pressure/high volume stage to advance and retract the cylinder (to get reasonable cycle time) and then will switch to a low volume high-pressure stage when the ram meets a restriction to provide the splitting power. Most commercial small engine driven log splitters are rated at 20 tons, so lets assume you are shooting for a 20 Ton unit. Force = 20 ton *20000 lbs/ton
Force = 40,000 pounds
If we work around your cylinder as a given we will find the following Cylinder area =PI * radius squared
Cylinder Area=3.1416*2.5^2 =19.635 Sq inches So if PSI= Force/area 40,000 pound /19.635 sq inches = 2037 pounds per square inch Is your cylinder rated for at least 2000 PSI of pressure? HP=GPM *PSI * 0.0007
GPM = HP/(PSI *0.0007)
If you use a single stage pump then,
4.5 gallon per minute is the max you can pump with 6.5 HP at 2037 PSIG
5.6 gallon per minute is the max you can pump with 8 HP at 2037 PSIG and I don't think you would be happy with your cycle times. Here is a good place to look at hydraulic components Link
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