When it comes to the large industrial Diesel engines like these, there is only really cat that makes them in the US. John Deere does some smaller ones, but nothing like what's needed for these grinders.
The more HP you can put into a grinder the better, with the larger C32 you won't need to push it nearly as hard to go through most woody material like you would a C27 or smaller. That will let the engine work less at maximum output and last longer. Our 4600 horizontal has a C27 in it, but we found it as a repo so we didn't specify the engine when it was built.
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