Electric V8 Engine (Cylinder Based Speed Control)

This Engine is for a Boat i am designing. I got the idea for the engine from youtube and actually designed a 12 cylinder micro version first.

this engine uses size 130 DC motors with optical AB Phase Encoders mounted to the back of them (see: https://www.ebay.com/itm/130-Motor-DC6V-12V-7800RPM-Metal-Speed-Encoder-Tachometer-Motor-AB-Phase/192486576192?epid=18003843567&hash=item2cd1181040:g:hKUAAOSw5k1cdyBy )

gears and shafts are all 0.8 modulus plastic gears that come in assortments on ebay.

you need 8 motors, 8 82 pinions (8 teeth, 2mm hole) and 4 crown gears in order to make this work. the biggest crown gear it will accomodate is a 16mm outer diameter.

the heads are deigned to hold the motors and be cooled by either water, or an oil circulation, or worst case scenario air. in my case since i am going to install this one on a boat i plan to pump cool water across them as to dissipate the heat and hopefully be able to run these way over voltage. if i was to put them on