In an inline six, each cylinder that’s undergoing a combustion stroke is balanced out by another cylinder that’s undergoing an induction stroke, and with these ‘paired’ cylinders often being located symmetrically around the centrepoint of the crankshaft, there’s very little vibration generated by an inline six-cylinder engine as a result.
yes they (3 and 4 cylinders) do rotate the same time but their firing interval is different
V6s, by contrast, do not enjoy the same harmonic advantage.
Because having all six exhaust ports on the same side of the engine means they can be merged together in a way that neatly separates the exhaust ‘pulses’ from each cylinder, something that’s harder to do on a V6 (but not impossible). Result: sonic bliss for straight-six performance cars.https://www.whichcar.com.au/car-advice/inline-6-versus-v6-why-are-straight-sixes-making-a-comeback
out of which SPFI is found to be generated only during superharmonics and subharmonic excitation.Video of balancing of 6 straight engine, four stroke - balancing
whilst the nature of the piston motion can never result in a 3rd-order imbalance (the pistons have no oscillation at that rate), it does appear in the kinetic energy exchange between the pistons and crankshaft (mathematically because of the squaring of velocity resulting in a specific intermodulation of frequencies). This means that a constant kinetic energy level for the rotating and reciprocating masses will result in the flywheel rotation speeding up and slowing down three times per revolution. This will in turn result in a cyclic so-called inertial torque being overlaid onto the combustion torque output from the crankshaft, which also has three pulses per revolution.[10]the forces are always balancing out - the primary and secondary cancel out - vid
secondary forces rotate WITH the crankshaft and happen twice as fast - twice per rotation...
In a four-stroke straight-six engine, there is a firing of every 120 a
I have seen ex-taxi examples with over 1,500,000 KM (1 million miles) that have had nothing but oil changes and zero engine work carried out!animation of straight six vid
3D computer animation of inline six with dual overhead camshafts vid
No comments:
Post a Comment