LondonRascal Posted September 18, 2014 Share Posted September 18, 2014 Engineers, wizards or just wise people... This has been on my mind for some time and I can’t really figure it out: You have two boat engines one produces 80HP and the other 85HP. One engine and produces 80HP at 2,500RPM and is a 4.085 litre engine. The other engine produces 85HP at 3,600RPM and is a 3.168 litre engine. So the question I have is - the lower horse power producing engine is actually a larger engine as it’s displacement it just over 4 litres, but it revs a lot lower at 2,500RPM. The higher Horse Power producing engine is smaller but revs a lot higher but gives you an extra 5HP. Would the higher HP but smaller displacement engine give better fuel economy, or would a larger displacement engine revving slower give you more fuel economy? Quote Link to comment Share on other sites More sharing options...
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