Spec C It's Staying
12 June 2013, 12:06 AM
#961
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I don't know, I've seen a press in work run for months non stop with out an issue but after a 24hr maintenance we started it back up and smashed the tooling. It would only run after the casting was warmed up.
Only after an X-ray/ultrasound (can remember which) was the hairline fracture found.
Strange things happen in this world. Like an engine failing for the same fault twice??
Only after an X-ray/ultrasound (can remember which) was the hairline fracture found.
Strange things happen in this world. Like an engine failing for the same fault twice??
12 June 2013, 12:10 AM
#962
I've seen some weird things in my time Dylan but given the serverity of the failure previous and if a crack was present and caused it then you wouldn't have done 5 miles on boost let alone 5K.
Cracks in heads or blocks that are bad enough to cause severe over heating and boiling don't just go away after a new HG is put on.
Cracks in heads or blocks that are bad enough to cause severe over heating and boiling don't just go away after a new HG is put on.
12 June 2013, 12:20 AM
#968
lol, ok, I should read posts more closely 
I was aware that Ty had only got it back recently, so was wondering if it might only have been driven in anger/on boost for a few 100 miles. Or was the SC50 the most recent addition?
Trying to see if there was, indeed, an issue prior/at the time of rebuild that might only have come to light once given some beans? For example, hariline cracks around plug holes are really common: no big deal at standard power, but wind up the boost and power, and things will soon let go.
I tried to read the history on this, but there are so many pages, it's difficult to get a potted history.
I was aware that Ty had only got it back recently, so was wondering if it might only have been driven in anger/on boost for a few 100 miles. Or was the SC50 the most recent addition?
Trying to see if there was, indeed, an issue prior/at the time of rebuild that might only have come to light once given some beans? For example, hariline cracks around plug holes are really common: no big deal at standard power, but wind up the boost and power, and things will soon let go.
I tried to read the history on this, but there are so many pages, it's difficult to get a potted history.
12 June 2013, 12:25 AM
#969
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lol, ok, I should read posts more closely
I was aware that Ty had only got it back recently, so was wondering if it might only have been driven in anger/on boost for a few 100 miles. Or was the SC50 the most recent addition?
Trying to see if there was, indeed, an issue prior/at the time of rebuild that might only have come to light once given some beans? For example, hariline cracks around plug holes are really common: no big deal at standard power, but wind up the boost and power, and things will soon let go.
I tried to read the history on this, but there are so many pages, it's difficult to get a potted history.
I was aware that Ty had only got it back recently, so was wondering if it might only have been driven in anger/on boost for a few 100 miles. Or was the SC50 the most recent addition?
Trying to see if there was, indeed, an issue prior/at the time of rebuild that might only have come to light once given some beans? For example, hariline cracks around plug holes are really common: no big deal at standard power, but wind up the boost and power, and things will soon let go.
I tried to read the history on this, but there are so many pages, it's difficult to get a potted history.
If I was to make an educated guess its a hair line fracture that is only causing an issue if the car is stressed to certain point. Once the point has been reached either through boost levels or over rev, the fracture never returns to its natural state and re seal. That's just my HND in Engineering guess.
12 June 2013, 12:29 AM
#971
Tim-the car had done around 4K or so on the LM400billet already and then the SC50/ID1000 and your toucan plus the alcatek upgrade were added while I freshened up the manifold/IC pipe work and fitted a new clutch plus a few other smaller bits.
At was at this point after mapping that it became evident that the engine was not happy running that sort of power,tbho it's not like it got used in anger during the short period on the new upgrades,the drive home Ty was stuck in traffic for most of it and then it literally did a couple of short trips after that.
Take from that what you will.
At was at this point after mapping that it became evident that the engine was not happy running that sort of power,tbho it's not like it got used in anger during the short period on the new upgrades,the drive home Ty was stuck in traffic for most of it and then it literally did a couple of short trips after that.
Take from that what you will.
12 June 2013, 12:33 AM
#972
An LM400 is not overly stressing the engine compared to an SC50 of course...so could well be something that was there all along, but something that would ideally have been found during the rebuild, assuming higher power was always the goal of course.
Either that, or it's the Toucan that's to blame
Either that, or it's the Toucan that's to blame
12 June 2013, 12:34 AM
#973
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Tim-the car had done around 4K or so on the LM400billet already and then the SC50/ID1000 and your toucan plus the alcatek upgrade were added while I freshened up the manifold/IC pipe work and fitted a new clutch plus a few other smaller bits.
At was at this point after mapping that it became evident that the engine was not happy running that sort of power,tbho it's not like it got used in anger during the short period on the new upgrades,the drive home Ty was stuck in traffic for most of it and then it literally did a couple of short trips after that.
Take from that what you will.
At was at this point after mapping that it became evident that the engine was not happy running that sort of power,tbho it's not like it got used in anger during the short period on the new upgrades,the drive home Ty was stuck in traffic for most of it and then it literally did a couple of short trips after that.
Take from that what you will.
I really don't want to drag this thread down. I didn't want to comment because I knew you would start again.
Ty all the best I hope you find the cause, I wish you all the best.
12 June 2013, 12:42 AM
#974
Your comment about the crack again,now if the crack appeared with the boost levels and volume of air from the stock turbo which was installed at the time of the first failure,what do you think said crack would do when the LM400 was installed given the extra boost pressure and volume of air?
My educated guess would be that it would be made worse given extra stress levels?
12 June 2013, 04:54 PM
#976
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ET is in Plymouth so a good few miles plus the miles on the rollers/road test afterwards and 2 trips down to me which is 90-100 miles depending on the route taken so yes around 1K miles.
Your comment about the crack again,now if the crack appeared with the boost levels and volume of air from the stock turbo which was installed at the time of the first failure,what do you think said crack would do when the LM400 was installed given the extra boost pressure and volume of air?
My educated guess would be that it would be made worse given extra stress levels?
Your comment about the crack again,now if the crack appeared with the boost levels and volume of air from the stock turbo which was installed at the time of the first failure,what do you think said crack would do when the LM400 was installed given the extra boost pressure and volume of air?
My educated guess would be that it would be made worse given extra stress levels?
With the old set up, the stress wouldn't be as big, maybe just separating the crack (going off the judgement that there is one) slightly, but now with the huge amount of power, boost etc, it could have stressed it all much more than before, highlighting everything very quickly.
12 June 2013, 05:09 PM
#977
I would have to disagree,like I say if the crack got to the point of causing severe over heating problems and pressurisation then adding even more stress from upgraded turbo etc it would have been evident from the start of the first mapping session when boost was applied.
12 June 2013, 05:15 PM
#978
Basically my point is that if the previous problem was crack related then simply rebuilding the engine and putting new HGs in place wouldn't have solved the problem and the problem would still have been there which leads me to believe that there isn't a crack issue.
Obviously I could be wrong and as stated,the issue points will be found upon strip down.
Obviously I could be wrong and as stated,the issue points will be found upon strip down.
12 June 2013, 05:16 PM
#979
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But when the car had the issue the first time, it wasn't survere, as such. It was done before it got to that stage I think, iirc.
This time, it's shown more or less straight away, with the mappers even suggesting its not going to last long, going off what was said on here.
And evidently, soon as its started seeing proper boost etc when being driven, it's given up.
On the rolling road, true pressures are never used, with no actual weight of the car having to be dragged, no wind etc. soon as its seen real world use, it's shown the problem.
I think I'm also agreeing there's something underlying since day one.
Anyway, I'm sure Ty will keep this enormous thread updated lol
Hope it all turns out okay
Edit: not amazingly clued up on Subaru engines. Is this a closed deck?
If not, maybe the crack has gone through the water jacket too and straight into the bore, causing this dramatic use of oil and water.
This time, it's shown more or less straight away, with the mappers even suggesting its not going to last long, going off what was said on here.
And evidently, soon as its started seeing proper boost etc when being driven, it's given up.
On the rolling road, true pressures are never used, with no actual weight of the car having to be dragged, no wind etc. soon as its seen real world use, it's shown the problem.
I think I'm also agreeing there's something underlying since day one.
Anyway, I'm sure Ty will keep this enormous thread updated lol
Hope it all turns out okay
Edit: not amazingly clued up on Subaru engines. Is this a closed deck?
If not, maybe the crack has gone through the water jacket too and straight into the bore, causing this dramatic use of oil and water.
Last edited by -G-; 12 June 2013 at 05:19 PM.
Tubbs 
12 June 2013, 05:38 PM
#984
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We're all only trying to help Ty. Not here to argue.
12 June 2013, 05:42 PM
#986
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12 June 2013, 08:01 PM
#989
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