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Straight vs helical cut oil pump gears
Posted: Fri Jun 11, 2010 3:53 pm
by Lunacy
Well had my oil pump all ready to go, but after finding a set of early evo helical cut gears in the box of bits i got yesterday, i started wondering if there were any benefits of running one more than the other?
They are the same size and both fit in my front timing cover.
Any thoughts?
Posted: Fri Jun 11, 2010 4:04 pm
by fugazi
Probably less noicey, but does it need to be? :)
Flow? Pressure?
Not better just different?
Posted: Fri Jun 11, 2010 4:09 pm
by Lunacy
fugazi wrote:Probably less noicey, but does it need to be? :)
Flow? Pressure?
Not better just different?
Yeah the noise was only thing i could think of, and as this is a track car, i dont really care about noise :beer
Posted: Thu Jun 17, 2010 6:44 pm
by Adriano
Ive actually seen the helical ones wear the oil pump housing, as they generate end thrust as they turn, wheras the straight cut ones dont
Posted: Tue Jun 22, 2010 10:05 pm
by Junkers
I always thought that unique 'electric' sound of the sohc 4g63 came from those straight cut teeth.. keep em