2000 R.P.M Vibration - Toyota Yaris Forums

jkuchta · 03-27-2009, 11:11 PM

Don't fotget this is an inline 4, which is inherantly unbalanced. A compromise is made as far as the harmonics are concerned to make the engine as smooth as possible at cruise rpm, while transiant harmonics are mitigated as much as possible through component weights (i.e. a heavy crank will have resonant frequencies than a lighter one).

Also, the stock crank pully is heavy for a reason. When I installed the 10% underdrive pulley I noticed an overall increase in vibrations, but everything smooth's out above 2K rpms.

dallas · 03-28-2009, 12:35 AM

Good info !

Quote:

Originally Posted by jkuchta

Don't fotget this is an inline 4, which is inherantly unbalanced. A compromise is made as far as the harmonics are concerned to make the engine as smooth as possible at cruise rpm, while transiant harmonics are mitigated as much as possible through component weights (i.e. a heavy crank will have resonant frequencies than a lighter one).

Also, the stock crank pully is heavy for a reason. When I installed the 10% underdrive pulley I noticed an overall increase in vibrations, but everything smooth's out above 2K rpms.

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03-27-2009, 11:11 PM	#1
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	Don't fotget this is an inline 4, which is inherantly unbalanced. A compromise is made as far as the harmonics are concerned to make the engine as smooth as possible at cruise rpm, while transiant harmonics are mitigated as much as possible through component weights (i.e. a heavy crank will have resonant frequencies than a lighter one). Also, the stock crank pully is heavy for a reason. When I installed the 10% underdrive pulley I noticed an overall increase in vibrations, but everything smooth's out above 2K rpms.