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Joined: Nov 2002
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Illusive
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Illusive Nov 25, 8:40pm - #62930 
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Posts: 396
Southern California
Okay My concious got the best of me(UR crank pulley)

So here it goes.

Guess what happend.

Oil pump failure. It basically exploded.

Metal shavings all in my oil pan.

This was not due to an overrev and not due to high rpm shifting,

it blew on me at 6200 rpms.

Cause UR crank pulley. Main bearings were okay as I shut it off immidiately after the oil pump blew. I towed it to the dealership, Luckily nothing else was damaged.

I got it replaced under warranty along with a slightly leaky waterpump.

I took off the crank pulley, water pump and alternator, prior to warranty work.

along with stocking out my celica minus AEM CAI and TRD exhaust.(which is why monkeywrench racing has my trial headder for tuning the pfc)


This is a WARNING to all UR crank pulley owners!!!!!!

Take yours off and get a refund. Your oil pump will go along with the main bearings and quite possably your engine.

I am not the first, I have insider info and there have been numerous others with simmilar failures with aftermarket crank pulleys (which were dumb enough to leave on and take to the dealership)

I was concidering selling mine as it was in good working condition but I dont feel comfortable selling it knowing it will cause someone to go though the same problems I went through.

I cant force people to take theirs off, all I can do is warn them. If i save one person from going through this hassle then it will be all worth it.

-J


Controlled Inertia
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ct
C'mon & hit me!
ct Nov 25, 8:45pm - #62931 

C'mon & hit me!
2000 Toyota Celica GTS

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Woodland Hills, CA
this is why i got the AEM. i'd rather have little hp gain and no worries than big gains and a possible engine wrech. sorry to hear about your car man...that sux. UR should compensate you accordingly. angry

Originally posted by SKOOF:
yoru such a clown, i wish you lived in nyc, i would love to just give you the beating that youve probably never gotten in your life.
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spaztikid
dikitzaps
spaztikid Nov 25, 9:27pm - #62932 
dikitzaps
1974 Toyota Celica

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LA
Originally Posted by ct
this is why i got the AEM. i'd rather have little hp gain and no worries than big gains and a possible engine wrech. sorry to hear about your car man...that sux. UR should compensate you accordingly. angry


yeah...thats total BS, i would get in contact with them if i was you.
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Illusive
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Illusive Nov 26, 3:40pm - #62933 
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Southern California
bump

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ct
C'mon & hit me!
ct Nov 26, 4:15pm - #62934 

C'mon & hit me!
2000 Toyota Celica GTS

Joined: Jan 2003
Posts: 2,139
Woodland Hills, CA
this should be stickied just for the fact that this question is asked every week and that it concerns the life of the car. rice

Originally posted by SKOOF:
yoru such a clown, i wish you lived in nyc, i would love to just give you the beating that youve probably never gotten in your life.
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Evan
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Evan Nov 26, 4:18pm - #62935 

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2003 Toyota Celica GT

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Damn that sucks. Glad you got it fixed under warranty thumbsup

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chameleon
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chameleon Nov 26, 4:53pm - #62936 

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2000 Toyota Celica

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Michigan
What makes you so sure that the pump failed because of the pully? There are a million things that could have caused it to blow on you, stock oil pump failure is a known 7th gen Celica issue. Plenty of people have blown the pump with the factory pully.

What other mods do you have to your car? Do you have stiffened motor mounts? Stiff mounts will amplify harmful vibrations a million times more than an undampend pully will.

Do you have suspention mods than improve your cornering ability? The Celica has an unbaffled oil pan, so if you are pulling more than 1G in the corners, you are in big risk of weakening the oil pan from oil starvation, which could definitly contribute to the pump to blowing out on you.

I'm not saying that the un-dampened pully didn't contribute to the pump failer, but I am very skeptical that it was the cause. Increased vibrations from losing the stock dampaner alone is going to be almost negligable, I would think that there would have to be many more contributing factors involved with this.

I am especially skeptical because you say that the engine blew at 6,200 rpm. The 2ZZ engine harmonically unbalanced at 2,000 rpm, so I cant see how you can blame the pully if you were at 6,200 RPM. confused
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chameleon
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chameleon Nov 26, 7:49pm - #62937 

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2000 Toyota Celica

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Michigan
EDIT:

I meant to say, pulling over 1G in the corners will significantly increase the risk of weakening the oil PUMP, not the oil pan.

And I'm sorry to hear about your car Illusive. frown

At least you were able to get everything fixed under warranty, it could have been worse.
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Illusive
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Illusive Nov 26, 8:57pm - #62938 
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this is currently being discussed on two forums as well

nc org thread

http://newcelica.org/forums/showthread.php?s=&threadid=110791

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Illusive
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Illusive Nov 26, 11:11pm - #62939 
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The best way I can explain what happend

quoted from boosted 2.0 off ncorg

"Saying that the pulley was not the main contributing factor is silly.

First of all Harmonic dampeners dampen harmonic vibrations and flexing in the crank. They are NOT for noise reduction. In case you don't know about the danger of harmonic vibrations - look into the most common example of the force of harmonic resonance - how armys have their soldiers march across bridges. They are forbidden to walk in-step with eachother, as the built up harmonic resonance can actually destroy the bridge itself.

Fact 1 - Excessive torsional vibration will most definitely help kill a rotary gear style oil pump like the one in the 2ZZ - the torsional vibrations allow the center drive gear lobes to vibrate back and forth against the outer ring gear which will weaken and put excessive strain on it. The forces are probably comparable to the additional stress experienced during an over-rev. Think about it - oil clearances in the pump are such that a non torsional vibration would have to be WAY out of hand before it actually did damage.

Which is not to say that radial vibration and variance doesn't occur with undampened pulleys - it does. When torsional flex puts the front of the crank out of phase with the rest of the crank then the weighting of the crank itself as well as the force of the power pulse will naturally start to cause some radial imbalance as well as torsional imbalance. This becomes most prominent when the crank reaches a frequency at which it has some harmonic resonance.

Fact 2 - consider the time of failure - just after 6200 rpm when he hit lift. What changes at 6200 RPM? Certainly not the RPM, not significantly anyways. So then what? Torque. Sudden application of large amounts of torque (ie: twisting force). Peak Torque on 2ZZ is 6800 RPM. Hence, the effect of torsional vibration (crank flex) from an undampened pulley will increase significantly in that time. If the failure was viscosity or weakness related it would have much more likely have happened at a higher RPM, not simply at the point just after lift apply.

Fact 3 - Undampened crank pulleys have been shown to cause problems on all kinds of engines. The reasons are always torque related, and thats why the motorcycle argument is so lame. Bikes have **** for torque - their stroke is minimal and they make all their power in terms of VE at high RPM. No torque load+shorter crank+ more precisely balanced assembly = way less torsional strain and vibration.

And all of this assumes that UR has done their job right and designed AND built the pulley to exactly correct balance, depth, and mating surface. The variance that is possible from UR itself could easily explain why some cars experience failures and some don't.

Given that everyone pretty much agrees that the stock pump is pretty weak if you push it past its normal operating environment, this mod seems like a HELL of a gamble to me.

anyways thats my 2 cents. Do what ya wanna do - just do it with full awareness of the POSSIBLE concequences down the road.

"

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VSGTS14
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VSGTS14 Nov 26, 11:33pm - #62940 

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SUBARU TECNICA INTERNATIONAL
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EuRoBoYGT
black & blue 4 you
EuRoBoYGT Nov 26, 11:38pm - #62941 

black & blue 4 you
2000 Toyota Celica GT

Joined: Oct 2002
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El Paso, TX
but is this the same for the gt since it only come with the crank and alternator pulley

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Krayze
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Krayze Nov 28, 6:32am - #62942 

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this does not only apply to ur pulleys it applies to any crank pulley for the 7th gen celica. Unles the new pullye has a damper built in but then it would be heavy and not work near as well. so if AEM makes a crank pulley it is no safer than unorthadox.

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Elec-FuYu
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Elec-FuYu Nov 28, 6:51am - #62943 
2003 Silver Toyota Celica
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damn!
is ur car fixed?
sorry abt ur car man!

I am a HID Maniac!!
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