![]() ![]() Likely your pumps are not operating with the crankcase at pumping pressure, so there will be blow-by past the rings. It ignores all the inefficiencies of the system - such as pressure drops across both filter and reed valves during operation. The displacement is simply derived from the bore and stroke, nothing more. It is the volume of air, measured at atmospheric pressure, which the compressor can deliver. Compressor output has little to do with ICE power outputs. My ‘interpretation’ is most certainly not an interpretattion at all - t is the plain facts. Not the whole answer by a long chalk, but a healthy starting point before adding in variables. I did a whole paper on Gabriel's Horn for my dissertation back in the 80's, a really amusing principle which demonstrates why variables are important in such matters, but for real world comparison on compressors a great starting point is displacement x frequency. Even something as simple as adding up the internal angles of a triangle where everyone knows the answer is always 180 degrees, right? Correct in Planar mathematics but not necessarily in Hyperbolic maths. ![]() That's the trouble with maths, as is demonstrated by accountants everywhere, every day, it's all in the interpretation. Suffice to say even the ideal gas equation is purely theoretical and takes no account of variables. ![]() Same principles which allow a 1300cc (ish) turbocharged rotary engine to produce ridiculous power outputs, (because they aren't really 1300cc) purely a baseline which can be used for comparisons otherwise we have to include elevation (above sea level), relative humidity, frictional losses and all other things which can be variable in the equation. It can only ever be theoretical on paper and thus it is a mathematical calculation which comes from cylinder displacement multiplied by the number of piston strokes per minute, nothing more, nothing less. Your interpretation of FAD is different to mine. So what do we think chaps? Replace the complete motor or try to repair it? Spinning the motor over the front bearing is noisy as hell too and since I don't have a press it will be hard to replace. It used to play hell with my tools until I called time and got rid of the drier. Started stripping the bits off the motor and there's a lot of rust inside, probably from 10 years of a tumble drier in the garage and all that condensation. One or two of the spade connectors on it have been hot in the past but they weren't exactly tight. The big capacitor seems physically OK but electrically I have no way of testing it. Temporarily bypassed that to see if it was just that thing and motor will turn but very slowly. Motor tried to turn over once I got the belt off but it trips the thing on the compressor power box - it's like a mini re settable fuse in the neutral. At least 18 years old and not worked massively. Left it, went out and set about it this morning.Ĭompressor is an old Clarke, about 14cfm if I recall. Went to check the car tyres before going out to a 50th birthday and BANG!. ![]()
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