why do GC8 models spin bearings?
#1
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Location: Grand cayman, Cayman Islands B.W.I
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why do GC8 models spin bearings?
Hey all, I live in the Cayman Islands and this is my 3rd scoob that has given trouble with engine bearings, either spun or eaten it, can anyone help me to understand why this happens and does it make sense for me to once again rebuild or rebuild and sell and get a GDB, I have heard they don't give that much trouble. I love my GC's but hate headaches. The car in question is a 99 Version 5 STI, I have owned a 96WRX and a 98 STI, I welcome any help / knowledge you all can pass my way. Thanks
#3
We can't tell you why your cars suffered bearing failure without having physical access to those engines and disassembling them. There are a variety of repetitive causal factors for bearing failure - from oil pump (or pressure relief valve) failure to pre-detonation (especially on a car mapped for Japanese high octane fuel) to the possibility of transient oil starvation caused by oil change, underfilling or surge.
As for what you've heard about newage cars being less prone to it, they do have some revisions to the oil system, but any suggestion that this problem has been "cured" is undermined with a quick search of this forum.
As for what you've heard about newage cars being less prone to it, they do have some revisions to the oil system, but any suggestion that this problem has been "cured" is undermined with a quick search of this forum.
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dont take this the wrong way but to have 3 engine failures on 3 different cars sound to me as it may be down to something your doing more than the engine i have a 96wrx running about 340bhp and its had alot of hammer over the 2 years iv had it with no problems at all (jinks now)id be tempted to look at what oil your useing and fuel grade
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No, I value all the info that is being offered, we have 86 and 93 octane, higher octane has to be imported and is mostly done for track use. Cars have all been serviced regularly, oil used Castrol Synthetic 10w-30 or when higher engine mileage is on the car my mechanic suggest's quakerstate 20w-50, pump in all cars with the exception of the 96 wrx are stock, after the rebuild it's all fine, its hard to get parts here for GC8's they either have to come directly from Japan, or try to get them from your side of the pond. I appreciate all your help/ suggestions.
#6
Cars have all been serviced regularly, oil used Castrol Synthetic
10w-30 or when higher engine mileage is on the car...
10w-30 or when higher engine mileage is on the car...
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#8
as above. 93 octain fuel is your problem. your car will need 97 ron or more.
your engines are failing due to what is called "pre ignition", "pinking" or "det"
either find some better fuel or have the ecu re-maped.
your engines are failing due to what is called "pre ignition", "pinking" or "det"
either find some better fuel or have the ecu re-maped.
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I use 93 octane and octane booster occasionally,
I believe he does, he has over 20 years experience, however could you
explain this process so i could maybe do it myself
Last edited by CarlsWrx; 02 January 2010 at 11:00 PM.
#12
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Really, never thought it could be the fuel, as for Re-mapping ecu's there is no place here that offers that service, would i have to maybe get a safc or something?
#13
As far as the oil change procedure there's already a lot written on it round these parts - have a quick search and you should dig it up.
#16
93 Octane is like 98RON in Europe so not too bad but when the ECU has maps for 100RON you've got to use Octane Booster. Perhaps you can get hold of Methanol or Ethanol for 5%-10% mix with 93Octane fuel to properly raise your Octane number much higher than using an octane booster.
I wouldn't be surprised if all your cars have been detting their ***** off and this is why you've had bottom end problems. You didn't mention if you use Semi-Synth or Fully Synth oil whatever the grade.
BTW... Cayman Islands sounds very nice. I'm on my way!!
I wouldn't be surprised if all your cars have been detting their ***** off and this is why you've had bottom end problems. You didn't mention if you use Semi-Synth or Fully Synth oil whatever the grade.
BTW... Cayman Islands sounds very nice. I'm on my way!!
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I believe reference is being made to part of the fabled "**** oil change procedure" If memory serves me correct, it comes just before "disconnect crank sensor and churn engine on the starter motor, whilst whistling God save the Queen"
JohnD
JohnD
Last edited by JohnD; 03 January 2010 at 01:10 PM.
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Temps here are mostly in the mid to high 80's yes it gets that hot sometimes, as for the meth, if I'm understanding correctly, a meth kit would keep me in the safe zone so to speak with fuel, the oil I use is fully synth, what's been happening here also is most gc guys swapped in the 2.5
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I can hardly credit it that anyone could blow 3 engines by , most likley , using fuel 10 ron less than it should have splitpin
just quietly putting forward the possiblity we have another lewis start-up aliias
just quietly putting forward the possiblity we have another lewis start-up aliias
Last edited by dpb; 03 January 2010 at 03:26 PM. Reason: its not unknow after all
#22
I also see you've failed to answer my question, which says a lot.
What is a "lewis start-up aliias"?
#25
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Gosh, aren't you the comedian?
Maybe you'd like to explain to us why the major Impreza specialists carry out that procedure, or maybe you'd like to read the second part of this and offer us a technically grounded counter-argument?
Maybe you'd like to explain to us why the major Impreza specialists carry out that procedure, or maybe you'd like to read the second part of this and offer us a technically grounded counter-argument?
I will say however, that with the boundary layer of good quality oil held in the bearings, an engine should not suffer damage for the couple of seconds (at the most) before oil pressure is established under minimal load conditions?
The handbook makes no reference to even pre-filling the oil filter, although why you wouldn't, is beyond me!
JohnD
#27
No, you were quoting "previous threads" in a very specific manner, as evidenced by your use/quote of the words fabled and "****", along with the reference to singing a silly song, thereby suggesting you were taking the p*ss.
If it's not your opinion you need to learn to express it a little more clearly.
I know who PSLewis is, what I wasn't sure of was exactly what dpb meant by "another startup alias", given that nobody posting on this thread is exactly new to Scoobynet.
Are you asking me or telling me? You can suggest the above if you like, but the recurring scenario of bearing failures in the minutes/hours/days following an oil change suggests that despite what you might believe, these engines do and are suffering bearing damage in the moments before oil pressure is established. For the third time, read the theory I linked to above and come up with an equally well grounded and explained reason why you think it's wrong.
Your point being? The owner's handbook doesn't tell you a load of stuff that is both important and obvious. The various service manuals contain errata that will result in serious problems if you don't use your common. Moral: Just because the service manual doesn't mention it, doesn't mean it ain't a good idea.
So you do carry out procedures that aren't in the manual then? Doesn't that undermine what you've just said?
It's not necessarily my opinion!
The reference to "Lewis" is the input to these threads by the legendary PSLewis
I will say however, that with the boundary layer of good quality oil held in the bearings, an engine should not suffer damage for the couple of seconds (at the most) before oil pressure is established under minimal load conditions?
The handbook makes no reference to even pre-filling the oil filter, although why you wouldn't, is beyond me!
although why you wouldn't, is beyond me!
#28
93 Octane is like 98RON in Europe so not too bad but when the ECU has maps for 100RON you've got to use Octane Booster. Perhaps you can get hold of Methanol or Ethanol for 5%-10% mix with 93Octane fuel to properly raise your Octane number much higher than using an octane booster.
I wouldn't be surprised if all your cars have been detting their ***** off and this is why you've had bottom end problems. You didn't mention if you use Semi-Synth or Fully Synth oil whatever the grade.
BTW... Cayman Islands sounds very nice. I'm on my way!!
I wouldn't be surprised if all your cars have been detting their ***** off and this is why you've had bottom end problems. You didn't mention if you use Semi-Synth or Fully Synth oil whatever the grade.
BTW... Cayman Islands sounds very nice. I'm on my way!!
please dont attempt to start a debate blaming semi synthetic oil over fully,,,,, these days oils are SOO well refined that on a general road going car even with the engine thermals of a impreza it aint gonna cause him to spin a shell,,,, even if he leaves if for 10k miles between changes,,, track use or very high speed driving AND DOING IT REGULAR then yeah he will need it but the temps for the shear values of most semi's is alot better than people give credit for
ive used semi synthetic for road use in my scooby,,, carlube tripleR and change to fully for track use/when i go to the ring or in the summer when the car gets a pasting on motorways,,,, winter time i use semi synthetic and the engine is fine after 20k miles !!!
same with the " prime the engine first" bollocks,, fill the oil fiter IS a must ill agree but priming is just a load of bollocks,,, where you thing the engine oil sits when you stop the car ???,,,,, and do you REALLY belive you drain ALL the oil out of a car when you change the oil ??? theres always old oil in the parts you are priming like a numpty moving it about,,,, the engine is still spinning ffs hence you are priming it ,,,, or you think that its turning at 2rpm when you disconnect the coil pack ? if so how does the pump get up to presure to pump the oil about ??? think about how the pump works and how a engine REALLY works