I have watched a video of engine balancing in which the Technician told that the in engine balancing they make the counter weight= Rotary mass+Half of reciprocatory mass..Why full reciprocatory mass is not taken..and what are the impacts of taking full reciprocatory mass.
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Engine balancing and reciprocatory mass
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GregLocock
Automotive
OP - you aren't talking about overall imbalance as such, but using out of balance on the crank webs to compensate for the linear reciprocating mass. The 50% figure is a rule of thumb, but in real engines where people calculate this stuff out, a number between 40 and 60% is the usual result. The way it is done these days is to simulate the pressure in each main journal for every speed and load, and to optimise the local imbalances, while retaining overall balance, to minimise the peaks in bearing load.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
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