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Posting a reply to: RE: Inline Cylinders -vs- V4 etc question

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[QUOTE]Red Man - 2/6/2005  6:56 PM

Muskies confuse me, engines I know. First thing is a V configuration is more compact and better ballanced than a inline. The V four will vibrate less. Tourqe is what moves a vehicle, horsepower is a byproduct of tourqe. The longer the stroke, the more tourqe an engine has at a lower r.p.m., but will not safely rev as high as a short stroke. Two engines can have the same horsepower rating and be of the same displacement, yet one will get a boat on plane faster. The one that makes tourqe at a lower r.p.m. is the one that gets you up sooner. 4,700 ft. per second is considered maximum safe piston speed(This is not r.p.m., but how many feet the piston travels in the cylinder per second) and after that bearings start to come apart. The venerable Ford 300 cbic inch straight 6 was a stump puller becouse of it's long stroke and small bore. It made power at low r.p.m.. There are three types of engine configurations, square, where the bore and stroke are the same (4 inch bore and 4 inch stroke), over square(4.5 inch bore and 3.5 stroke), and under square(3.5 inch bore and 4.5 inch stroke). Todays engines most comonly are square or oversquare. Harleys are still undersquare. My 93 incher is 3 5/8x4 1/2. Higher compression makes more power, but can also cause detonation with low octane fuel. A bathtub combustion chamber can handle more compression than a hemi becouse it burns the fuel more efficiently and evenly. Higher octane fuel is no more powerful than low octane, it simply burns slower to allow more advance of timing and higher compression. When oil is added to gas it lowers the octane. I have tried to keep this simple and I won't go into two stroke limitations becouse of the intake and exoust ports or camshaft lifts, duration and timing. Let alone reversion waves, CV carbs and fuel injection. Bottom line is a V engine is a better design and if two engines have the same power and one has a significantly larger displacement, the one with the larger displacement is not working as hard and will have a longer life, all things being equal like having the same power at the same r.p.m., Later[/QUOTE]

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Red Man

Posted 2/6/2005 6:56 PM (#133982 - in reply to #133981)
Subject: RE: Inline Cylinders -vs- V4 etc question

Posts: 152