team3d
Senior Member
- Joined
- Aug 15, 2016
- Threads
- 32
- Messages
- 511
- Reaction score
- 296
- Location
- los angeles
- Vehicle(s)
- 2016 civic lx
- Thread starter
- #1
harmonic balancer is a device that added to crossplane v8 engine around 70yrs ago by car manufacturers (gm, ford, etc...) to absorb vibrations
the reason why they need an external device to reduce vibrations is becuase crossplane v8's crankshaft can't be balance to 0 (can balance close to 0) due to it's length. with crossplane's firing order and unbalance-able crankshaft, it create more vibrations that the crankshaft's counterweight can't canceled and thus the "band-aid" fix is to add counterweight to the end of the crankshaft to remove the additional vibrations, to put it in a simple term, they need to "filter" the vibration twice...
now, lets look at our engine, if you look through 9th gen civic's parts catalog, you will not find harmonic balancer. because we don't have harmonic balancer.. we have crank pulley.
k24z7, like most inline 4 engine, we have very short crankshaft. all late model inline 4 engine are internally balanced & due to the advance design of a Japanese engine, our crankshaft's counterweight can cancel out primary vibrations almost 100%, thus we do not use or need harmonic balancer.
k24z7 crankshaft with counterweight.... this is the device honda use to cancel out primary vibrations... not harmonic balancer
but due to the vertical design of the inline 4, our engine have 2 sets of vibrations... it's why the crankshaft counter weight only can cancel out the primary vibrations... to cancel out the secondary vibrations, most inline 4 engine will add balance shafts under the crankshaft. the balance shaft will cancel out secondary vibrations cause by the design of the engine.
k24z7 oil pump with balance shaft.... this is the device honda use to cancel out secondary vibrations... not harmonic balancer
i hope this will clears things up... the problem with this urban myth is cause by both sides...
the consumers especially 1st timers will not know anything about this because this is very technical... so the false information keep spreading like a snowball,
but the blame is to the tuner/vendors, for the past 20yrs, there are too many tuners/vendors without proper engine knowledge/foundation start their own shop, brand, company and when a consumer ask questions about pulley, they don't know the answer either..... just becuase a person can race a car, install a turbo kit or tune your ecu doesn't mean he understand how mechanical parts function, especially this particular knowledge requires a basic understanding on various engine designs..
in conclusion, yes, light weight, underdrive pulley are perfectly safe for k24z7.... will it make any power ? of-course it will... if it doesn't why car manufactures spend 100's of millions developing electric water pump & electric power steering ? and if you can't link electric water pump/power steering to light weight, underdrive pulley ? go to library and pick up some automotive engineering books to read... it will benefit you if you really like cars...
team3d......
the reason why they need an external device to reduce vibrations is becuase crossplane v8's crankshaft can't be balance to 0 (can balance close to 0) due to it's length. with crossplane's firing order and unbalance-able crankshaft, it create more vibrations that the crankshaft's counterweight can't canceled and thus the "band-aid" fix is to add counterweight to the end of the crankshaft to remove the additional vibrations, to put it in a simple term, they need to "filter" the vibration twice...
now, lets look at our engine, if you look through 9th gen civic's parts catalog, you will not find harmonic balancer. because we don't have harmonic balancer.. we have crank pulley.
k24z7, like most inline 4 engine, we have very short crankshaft. all late model inline 4 engine are internally balanced & due to the advance design of a Japanese engine, our crankshaft's counterweight can cancel out primary vibrations almost 100%, thus we do not use or need harmonic balancer.
k24z7 crankshaft with counterweight.... this is the device honda use to cancel out primary vibrations... not harmonic balancer
but due to the vertical design of the inline 4, our engine have 2 sets of vibrations... it's why the crankshaft counter weight only can cancel out the primary vibrations... to cancel out the secondary vibrations, most inline 4 engine will add balance shafts under the crankshaft. the balance shaft will cancel out secondary vibrations cause by the design of the engine.
k24z7 oil pump with balance shaft.... this is the device honda use to cancel out secondary vibrations... not harmonic balancer
i hope this will clears things up... the problem with this urban myth is cause by both sides...
the consumers especially 1st timers will not know anything about this because this is very technical... so the false information keep spreading like a snowball,
but the blame is to the tuner/vendors, for the past 20yrs, there are too many tuners/vendors without proper engine knowledge/foundation start their own shop, brand, company and when a consumer ask questions about pulley, they don't know the answer either..... just becuase a person can race a car, install a turbo kit or tune your ecu doesn't mean he understand how mechanical parts function, especially this particular knowledge requires a basic understanding on various engine designs..
in conclusion, yes, light weight, underdrive pulley are perfectly safe for k24z7.... will it make any power ? of-course it will... if it doesn't why car manufactures spend 100's of millions developing electric water pump & electric power steering ? and if you can't link electric water pump/power steering to light weight, underdrive pulley ? go to library and pick up some automotive engineering books to read... it will benefit you if you really like cars...
team3d......