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A little late to the game here, but in case anyone ever stumbles on this question like I did, this is a BAD idea. It sounds like you just want to plumb air into a hydraulic cylinder, in which case, when the log splits you will have several TONS of stored energy that will get released all at once. Others have discussed this below. If you're wanting to use a Pneumatically actuated jack, that's going to be very slow, and not have enough stroke to do a decent job. If you have an actual air over oil cylinder, then it's doable but one of those will cost more than a used splitter, and your air compressor is going to burn itself up trying to keep up. If you don't want the noise, you're better off using an electric motor in place of the gas engine. You're probably not going to be able to get 12 Ton out of it even if you have a 230V circuit available, but you might be able to develop 8 ton or so, and do it pretty quietly. They also sell some electric splitters that might do a good job.
The reason air over hydraulics doesn't "fly off the handle" is because the flow rate of the oil is restricted by the size of the orifices that are built into the system. Without these flow restrictions, the system would slam back and forth just like a pneumatic cylinder. In other words your air over oil jacks work smoothly and safely because the components were designed for that purpose. If you rig up your own system, and fail to address this issue, the results may not be what you were looking for.
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