ScoobyWhite

Hi

Like you all I have a Subaru . I have my passion car it is a Impreza MY00.
Because of this great love I upgrade my car in all sectors and one of this sectors is the engine.

So I would like to know something, and I would like to know you honest opinion, because when we do this (upgrade engine performance) some day we will have problems !!!!
Since I upgrade my whit only "the best" parts that I can find/buy i have troubles!!
I would like to know how do you resolve the big problem whit fail of the bearings??
My car "only" have this kind of problem!!!! and more them once....
Please I would like to ear may answers and some help because I already just do not know what I can do more...............????

Best Regards

john banks

Joao, has a big end bearing gone again? Sorry to hear this if this is the case! If so, what were the circumstances?

Factors I can think of, but no one really knows:

Detonation avoidance - working knocklink should do
Avoiding over-revving/sustained high speed
Oil quality - I and many others use Motul Motorsport 15W50
Oil change procedure - pre-fill oil filter, crank with crank position sensor disconnected to build oil pressure
Oil pump mods - sticky relief valve has been implicated in failures by some, others disagree

If you've sorted all of these I don't know what else to suggest!

ScoobyWhite

Thank you for your care Mr. John.

I do not know but the noise that I ear is not from the heads, so I am affraid that will be again the same problem!!

Has you know I install this engine and run more or less 12000km only !
Now the noise very low but the noise is there.

I will change the engine oil, but I use a good 10w-40 engine oil.
I never have time to test this engine, I never tried the performances in this one , so I never drive hard!!!
Knock Link never tell me nothing So I presume everything is fine!!
I change the engine oil every 6500km and I think that in the work shop they follow the rules.
My engine oil pump, is a better one from Roger Clark Motorsport.

I already does not know what should I do??? What I have to change, what parts I have to buy???

I JUST DO NOT KNOW ANYTHING!!!! I think that I have everything that many of you have and apparently I am the only that have problems!!


Best Regards

john banks

Measuring the oil pressure now will help to add to the impression that a big end that has gone if the sound is similar to the last time but quieter. The oil pressure will probably be low - the oil pressure leaks around the bearing shell which no longer provides a good seal.

Worth double checking the oil change procedure with the garage. You live in a hot environment with a modded car, I think 15W50 may be better. Had the car been sitting unused for a while and then started again?

I'm not saying there is anything in this to explain it though...

I know the feeling, in that I have lost two sets of headgaskets on my 2.5, but I pushed it hard for the spec of the engine and deserved it. With the mods you are running on the 2.0 I think it should be able to hold together nicely though!

ScoobyWhite

This is the problem..............I think that whit the mods that I have the car should be very reliability, but I since fit evertyhing that you see and BR to I have problems!!!!! And I do not know / can understand why???

I have to check the oil change in the garage, but I never push this engine, so I cannot understand!!
The Oil pressure is fine and when runing the engine in all 12000km was fine!!
The sound is there but I do not know what it is?? But I can not imagine anything else, because is a very low noise but is there!!!

Any sugestions??

Yes the car was stop in the garage two weeks. This was the problem??


Best Regards

harvey

iTrader: (48)

Hi Joao : I got your link. I do not know how somebody sat in the UK is going to diagnose your "engine noise" when you are 1000 miles away. If the oil pressure is normal when the engine reaches full operating temperature it is not your main bearings or big ends. Have you measured oil pressure at full operating temperature ?
Who built the engine ? What do they think the noise is ? If you cannot find anything and you have full oil pressure get on an enjoy the car. The worst that can happen is the noise becomes more prominent.

ScoobyWhite

Thanks Mr. Harvey for your help.

I understand that you there cannot ear the engine but I am searching for help only!

The engine is a new Impreza Short block EJ20 built by Subaru that the garage only attach the heads!

The noise just started when I turn on the engine past the two weeks that he was stop and without working!!
The oil presures are normal exactly the same that when this engine first days!!
The people in the garage tell me that if the problem is not from the head must be the same thing that the last one (bearings) but that can only now if they open the engine!!
What you think that this can be?? I am affraid that if I start use the car I can have the same problem that I already have a big expense again!!!

Regards

john banks

Can't see two weeks being a problem Joao. If a few months I would crank it with the crank sensor disconnected, but not a few weeks.

Just wondering if the garage would see anything useful by taking the sump off and looking for bluish discolouration of the rods.... but I'm no engine builder.

As Harvey says, no one can diagnose it remotely. It is not impossible that it could be something else, cambelt tensioners can be noisy, as can clutch release bearings for example.

harvey

iTrader: (48)

If the oil pressure is the same when fully warmed then it is not your bearings.
You have little to loose by running it normally until the noise develops, if indeed it does that. It might go away or you might find it is something else totally unrelated or even unimportant.
Anyway I hope that is what happens for you but worrying over it is not going to achieve anything.

ScoobyWhite

Update!

I last night change the oil filter and the oil again!!
I think that the noise is there but is a low noise now! But is there!!
One sound it is from the engine (I have positive of that) but the other tik tik tik noise I think is from the 3rd port solenoid!!! Could this be??

I because the car was stop have the same gas tank from almoust a month (westerday I fill the tank whit a new gas ) But whit the other gas tank I do not feel the car runing well!! I think is slow!
I put some new gas and I feel the same, and I think (but could be my mind) that the lambda link is reading lower values!! I see evertyhing that I think and only one answer I can think to resolve or that can be that is causing this: MAF sensor!!
I run more or less faster yesterday whit the car and all the values in the gauges (exclude lambda link readings I think) and everything is normal!!
The noise when I arrive home is the same or quiet but is there!!!

I will run the car and see and post here like today some updates !!

But what do you think of what I tell above?? I think that I should have something very strange in my car, but I can not understand what it is???
And the MAF question??? What do you think??


Best Regards

john banks

The 3 port usually gives a frequency of about 15 Hz or so and will be localised to the solenoid itself. MAF sensor could make it leaner, dodgy lambda sensor could make it appear leaner, neither should cause a noise.

The noise really could be so many things... I am glad it seems quieter anyway. Worth thinking about whether the noise changes with revs or throttle, clutch up or down etc.

tweenierob

Take the Right hand cam belt cover off and let us know if the noise sounds louder.

Sounds like classic timing belt tensioner failure.

Rob

Andy.F

Its surprising how much oil pressure the engine holds even when a bearing is on its way out, I recently had a car which was generating slightly increasing background noise from the bottom end during mapping (heard on the det cans) oil pressure at 3000rpm had only dropped slightly from 6.5 to 6.0 bar and oil temp went from 95C to 105C at which point we decided to stop running it as a precaution. On strip down the bearing was found to be shot and even the crank was damaged.

Was there any metal on your sump plug when the oil was changed ?

Andy

ScoobyWhite

Thanks for your care guys!!! whit special attention to the ones that know me

I will buy a new MAF sensor just in case and then I will see the results!
So the noise of the 3rd port solenoid it is explain!!

I will see this of the cam belt cover and them post here what I ear!! Thanks once again!!

When the oil was changed I did not see any metal but I do not have soure!!
Yes I think now that the sound is lower but is there , I think that the sound start about 2000rpm and stop 2500rpm-3000rpm pass this rpm I can ear anything!
But the noise is not always there!! Some times you whit the same action pass this revs and you never ear something, other time you ear!!
Other thing I will trie this of the cam cover because I whit the old acts whit a screw drive I put there my ear and I can not fell any diferences on the engine (left from right) everything sounds good, but you ear outside "whit the other ear" the noise!!

Once again many regards and thanks to everyone!!