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Air cooled two stroke as inboard?
Err... the guy said "putting a small (300cc) aircooled two stroke as an inboard in a small wooden boat". He didn't talk about enclosing it or anything else. In fact he says "With adequate air circulation can anyone see any potential issues here?". Given his specifications (small boat, small engine) and that he has stated that he is prepared to cope with air circulation problems what are your concerns? That he, like you, has grossly underestimated this issue. In reference to the Honda, do you really think that the cooling requirements on a two stroke engine is different from that on a four stroke? Absolutely. Small gas engines of the utility variety ("lawn mower"engines) have long been used as inboard engines in small wooden boats. Up here in the Pacific NW USA, a local traditional boat called the Poulsbo (or Young) boat was frequently powered with an air-cooled Wisconsin or B&S single lunger. The Poulsbo boat usually was between 16 and 18 feet long and was open. The motor hung out in the breeze. These air-cooled four stroke engines were relatively slow turning and the noise was only mildly objectionable. A modern air-cooled two stroke inboard would need to spin at a much higher speed and would create quite a racket. Would a small, 300cc, two stroke inboard work? Sure but the effort would be high and results may not be satisfactory. If the OP really wants a small boat inboard, look for a vintage four-stroke. It might be more practical to design/redesign/modify the boat for an outboard. A few of the surviving Poulsbo boats have been modified to use an outboard, either on a bracket on the stern (easiest) or in a well (elegant but lots of work). |
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