Reason For Balance Shafts???

[jyoungblood87]

wat is the reason the F-series motor to have front and rear balance shafts??? and are they really that neccessary???

[prNonVtec4u]

from what i know, there's people that actually just take the belt off and run just like that, so i guess it's not that necessary

they say it actually frees up some power up top, just gotta make sure they don't have any spin to keep oil pressure....

i might be incorrect... Hondafan and d112crzy will know from first-hand expirience

[SMseagren83]

they are supposed to keep engine vibrations to a minimum and everything rotating smoothly....


they arent necessary, there are other honda engines that dont have them.

[NAiL05]

Balance shafts are used cancel out vibrations in the motor basically (easiest definition i can think of). They arent needed but they are there as more of a comfort device.

EDIT: damn it sms beat me to it lol.

[prNonVtec4u]

so you CAN just take off the belt and everthing will be just fine?

[starchland]

im questionning the engine longevity of the engine w/o belts

[prNonVtec4u]

im questionning the engine longevity of the engine w/o belts

engine longetivity of the engine

x2 on that though ...

[Shadow1]

i know d112crzy did. i asked if really did but he never answered me. i hate it when people do that. lol


anyways. ive been thinking about it but i want to find out for sure tho.

[starchland]

what i meant was the longevity of the engine lol braind diahria fart

[SMseagren83]

i cant say based on personal experience....BUT its just something honda decided to do with the accords/preludes.

look at the B-series engines! high reving, no balancer shafts, no issues. its just kinda like a luxory that our engines got. hahaha

shoot even old fart techs at work have said they dont do THAT much, and they arent necessary...


food for thought. do it if you want, OR not. IMO the little gains arent worth it. lol

[AshesWagon]

well balance shaft are meant for what everyone else has said they are also meant to help with damageing harmonic frequencies to the internal components (piston crank rods)they are meant to absorb these. not trying to scare you off from doing it cuz when i had my lude and built the engine there is a company that sold a delete kit oil jacket plugs and block plugs and whatnot and i never had a problem but during the build i also balance everything in the motor even so i donnt know what to tell you. as for engine longevity come on you drive a f series only like the most beat on and longest lasting little motors in the world.

disclaimer: i didnt say do it so if you do dont get mad at me, just do some research on it.

[owequitit]

The balance shafts serve actually no structural purpose. I haven't had one in years, on my F22, or my H22.

It is simply because 4 cylinders inherently have what is known as "second order vibration." The bigger the rotating mass (i.e. displacement), the bigger the vibration. This would be felt through the steering wheel as that vibrating sander texture.

Pretty much anything above 2.0 L needs them simply to smooth them out. I think even the K20 has them if I remember correctly, as does the R18 in the new Civic. There is a noticable difference in the vibration with the belt off, when your hands are on the steering wheel at idle. But it isn't really that much, and it isn't going to hurt anything. It also helps it rev slightly more freely, but also makes it sound a little more coarse. It saves about 3WHP on an H22, mostly up top, since the shafts rotate at 2x the engine speed, and at 16,000 RPM, they do produce friction. The newer designs are probably more efficient, as they are located down in the crankcase, below the crank, and are contained in a small case.

Honestly, I left mine off because it was easier. I have been thinking about putting it back on next T-belt change, but we will see.

[owequitit]

well balance shaft are meant for what everyone else has said they are also meant to help with damageing harmonic frequencies to the internal components (piston crank rods)they are meant to absorb these. not trying to scare you off from doing it cuz when i had my lude and built the engine there is a company that sold a delete kit oil jacket plugs and block plugs and whatnot and i never had a problem but during the build i also balance everything in the motor even so i donnt know what to tell you. as for engine longevity come on you drive a f series only like the most beat on and longest lasting little motors in the world.

disclaimer: i didnt say do it so if you do dont get mad at me, just do some research on it.

Honda's rotating assemblies are very finely balanced from the factory. It isn't like an old GM where the crank pulley is there to keep the rotating assembly from exploding.

The balance shafts in an H22/F22 have nothing to do with harmonic damping, as they are not directly part of the rotating assembly, and thus have no way of damping harmonic vibrations.

[NAiL05]

well if you take out the complete assembly as in the complete shafts supposedly you get pretty good gains as people have been saying on HT and scott mentioned it a few times as I recall. But then you would need to purchase that Kaizen kit and press some stuff in. And a slight rise in oil pressure with it removed because of the blocked ports to the balance shafts.

[prNonVtec4u]

i guess i can give it a try... still kinda gives me a lil bad tickle