I might go with a series wound motor, something like a golf cart motor would work well and give more peek HP and low end torque, but they might not do well with high speeds (6,000 RPM red line of the gas engine), so yeah a free wheel, I'd also have to make an end plate for it as golf cart motors don't have them, or I could try to talk my dad out of his 36v series wound motor that is sitting in the garage as that one has an end plate and normal shaft but is not something everyone else can get their hands on, those motors are also sealed up for the most part, so dust, dirt and water wouldn't be as much of an issue.
Time to take some measurements, will a 6.7" by 9" motor fit where the A/C compressor lived?
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