stock oil pump 2uzfe
- Thread starter thalj
- Start date
The 1UZFE EGR Delete Kit is available for sale here.
What is the theory on the failures? To much pressure? Harmonics?
What is the material? Powdered metal?
There would seem to be a limited amount of stress on the pump unless something caused a restriction or debris was ingested.
Here is video demonstrating the action of a gear pump in an SR20 engine.
http://www.youtube.com/watch?v=0jClJuLU2qg
Initial searching of "why oil pump fails" didn't turn up any solid engineering responses but had a number of responses pointing to the harmonic balancer. Changing the engines weights and components will alter its harmonic resonances and could certainly contribute if not outright cause failure in this tight clearanced component (gerotor oil pump).
Here is a honda-tech board discussion
http://www.honda-tech.com/showthread.php?t=2038414
Here is a simple image. The assembly would have tight fitting walls on either side with an intake port just to the top left and outlet to the top right. Notice as the rotation begins at the top the area goes from nothing to expanding this draws in the fluid being pumped. The opposite happens as the rotation continues and the area gets smaller hence moving the fluid. If the speed of rotation moves the fluid faster than whatever is receiving the fluid can flow there will be a pressure increase.
http://en.wikipedia.org/wiki/File:Gerotor_anm.gif
XR8tt
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I havn't heard any issues with these pumps...
JBrady
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The worry is the rods. Stock rods are NOT strong enough for high RPM operation. Never heard of an RPM related oil pump failure on this engine family.
Arnout
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I have seen oil pumps fail on various engines with comparable oil pumps, like RB's and JZ engines.
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We know of one 1UZ VVTi revving to 9,500!
It spun a bearing but the oil pump is fine.
Looks like side clearances on the rods were too tight.
It spun a bearing but the oil pump is fine.
Looks like side clearances on the rods were too tight.
JBrady
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- Houston Texas
What is the theory on the failures? To much pressure? Harmonics?
What is the material? Powdered metal?
There would seem to be a limited amount of stress on the pump unless something caused a restriction or debris was ingested.
Here is video demonstrating the action of a gear pump in an SR20 engine.
http://www.youtube.com/watch?v=0jClJuLU2qg
Initial searching of "why oil pump fails" didn't turn up any solid engineering responses but had a number of responses pointing to the harmonic balancer. Changing the engines weights and components will alter its harmonic resonances and could certainly contribute if not outright cause failure in this tight clearanced component (gerotor oil pump).
Here is a honda-tech board discussion
http://www.honda-tech.com/showthread.php?t=2038414
Here is a simple image. The assembly would have tight fitting walls on either side with an intake port just to the top left and outlet to the top right. Notice as the rotation begins at the top the area goes from nothing to expanding this draws in the fluid being pumped. The opposite happens as the rotation continues and the area gets smaller hence moving the fluid. If the speed of rotation moves the fluid faster than whatever is receiving the fluid can flow there will be a pressure increase.
http://en.wikipedia.org/wiki/File:Gerotor_anm.gif
Arnout
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- Netherlands
I also think it has to do mainly with harmonic balances, however I exploded a 2jz pump on a stock 2jz shortblock. Stock everything (on the shortblock)
XR8tt
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- Sydney Australia
A few Detroit engines have had oil pump issues,,
Main suspect was the metal quality of the gears..
Our XR6T's and 5.4 Boss Ford V8's had issues with big rpm..
Two totally different engines but I suspect same supplier ??
Parts come from all over the world these days..
Some tries cryo treating them while other machine shops made there own
with a CNC machine using better material / alloys..
It seems a harmonic problem. Due to high powered forced induction engines pulling low rpm [std rpm limit] didn't seem to have an oil pump issue..
We have an engine failure due to oil pump in a 2.4 Nissan diesel due to faulty oil pump drive spline.. Simply wasn't one !!
Main suspect was the metal quality of the gears..
Our XR6T's and 5.4 Boss Ford V8's had issues with big rpm..
Two totally different engines but I suspect same supplier ??
Parts come from all over the world these days..
Some tries cryo treating them while other machine shops made there own
with a CNC machine using better material / alloys..
It seems a harmonic problem. Due to high powered forced induction engines pulling low rpm [std rpm limit] didn't seem to have an oil pump issue..
We have an engine failure due to oil pump in a 2.4 Nissan diesel due to faulty oil pump drive spline.. Simply wasn't one !!
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