Log splitter

Couple years back I purchased a 6-ton mini log splitter. http://www.minisplitters.com/6_Ton_Manual.html
The unit works as advertised but I'd like to upgrade the unit with an air-hydraulic jack. The manufacturer sells such an upgrade but the cost of it is nearly the price of the original log splitter itself. Plus they do so only for the next larger size splitter which may have different dimensions.
As I shop around I see numerous air-hydraulic bottle jacks available. Each calls for a range of CFM and pressure. Ideally I'd like to be able to utilize a simple home quality electric compressor. Are the CFM and pressure requirements critical if not trying to split larger pieces?
Without resorting to modifying the base, the jack would need to fit into a space approximately 3 1/8 x 5 1/4. Might someone be able to recommend where I can find components that fit?
Any chance someone here has already done a similar upgrade?
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Some engineer is getting big bucks to do design and testing on those things. There is a reason they come up with certain numbers. Less CFM will slow down the job considerably, less pressure may cause it to stall.
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Edwin Pawlowski wrote:

design limits for the bottle jack.
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