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Anyone run a zenoah “pum” engine in a 1/4 scale?
Posted: August 30th, 2021, 4:42 pm
by steve g
I have the opportunity to get a 30cc zenoah airplane engine that’s converted to water cooling with a pull start, it’s not designed for a car but is heavily modified and supposedly can belt out tremendous RPMs and has great power. The block will accept a traditional g2d bell housing and clutch assembly. I’m building a car where width is an issue and this engine has no flywheel/cooling system like traditional 1/4 scale engines.
Anyone done this? Good idea or horrible idea? Any advice appreciated
Re: Anyone run a zenoah “pum” engine in a 1/4 scale?
Posted: August 31st, 2021, 6:17 am
by Kaye
steve g:
These engines are commonly used in model boats. I don't have one in any of my boats, my boats are Mathe powered. I've often thought about running a 'pum' in a model car but never tried it. Obviously a small radiator (with electric fan) would be needed to cool the engine. Coolant circulation can be achieved by using a crankcase pressure tap, or a pressure tap into the carburetor isolating block (both methods commonly used on rc gas boats). If I was doing it, I'd use a small electric pump for coolant circulation.
Kaye
Re: Anyone run a zenoah “pum” engine in a 1/4 scale?
Posted: September 10th, 2021, 7:09 am
by anytimerc
Not recommended and you can wreck the cylinder head if you can't keep it cool. It will overheat and shut down.