Engine Failure - Survey
18 September 2002, 01:23 PM
#92
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Andy, missed that one, but FWIW ...
Cruising temps in winter : about 80°C
Cruising temps in summer: about 90 to 95°C
Idling after normal drive: going up to 100°C
Pushing it on normal roads : about 105°C max
Pushing it on track : highest I've seen is 115 to 120°C after being out for more than 2 hours.
Removing the splash guard lowered temps by about 5°C, but that may be due to the position of the sensor (sump plug). I think Bob Rawle saw a similar thing (can't remember the thread)
Using RS 10W60 again both lowered average oil temp by about 5°C & increased oil pressure slightly.
This was all pré-FMIC, no data on current situation yet (apart from normal driving, temps seem to be the same)
Cruising temps in winter : about 80°C
Cruising temps in summer: about 90 to 95°C
Idling after normal drive: going up to 100°C
Pushing it on normal roads : about 105°C max
Pushing it on track : highest I've seen is 115 to 120°C after being out for more than 2 hours.
Removing the splash guard lowered temps by about 5°C, but that may be due to the position of the sensor (sump plug). I think Bob Rawle saw a similar thing (can't remember the thread)
Using RS 10W60 again both lowered average oil temp by about 5°C & increased oil pressure slightly.
This was all pré-FMIC, no data on current situation yet (apart from normal driving, temps seem to be the same)
18 September 2002, 06:10 PM
#93
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Thats good news Theo 
Looks like an (additional) oil cooler isn't really necessary then. Most oils are happy at that temp AFAIK.
Nom's results seem a bit high though ?
Looks like an (additional) oil cooler isn't really necessary then. Most oils are happy at that temp AFAIK. Nom's results seem a bit high though ?
18 September 2002, 06:24 PM
#94
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They're actually a little lower than Theo's I think, or vary less anyway.
Cruising temps in winter : haven't had one with the temp gauge yet
Cruising temps in summer: about 90°C
Idling after normal drive: going up to 95°C
Pushing it on normal roads : about 95°C max
Pushing it on track : only just got the brakes sorted
The 145°C is peak as recorded by the gauge - I don't actually see anywhere near that figure when driving. But why it is there in the first place puzzles me - my intention (but I keep forgetting) is to reset it, drive about as usual, check the peak after the drive & if it isn't registered as that high check it again at next startup. If it's high then, there's either some serious heatsoak coming from somewhere, or an electrical spike causing the reading... (this is with the meter reading even when the ignition's off).
Well, it gives me something to do, anyway
Cruising temps in winter : haven't had one with the temp gauge yet
Cruising temps in summer: about 90°C
Idling after normal drive: going up to 95°C
Pushing it on normal roads : about 95°C max
Pushing it on track : only just got the brakes sorted
The 145°C is peak as recorded by the gauge - I don't actually see anywhere near that figure when driving. But why it is there in the first place puzzles me - my intention (but I keep forgetting
) is to reset it, drive about as usual, check the peak after the drive & if it isn't registered as that high check it again at next startup. If it's high then, there's either some serious heatsoak coming from somewhere, or an electrical spike causing the reading... (this is with the meter reading even when the ignition's off).Well, it gives me something to do, anyway
18 September 2002, 09:57 PM
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nom, just a hunch but
would be my bet really.
Your temps don't seem to be very different from mine (once you sort yer brakes
), I don't trust those gauges up to 5°C's anyway, and I just don't have the gut feeling oil temps on the Impreza are way off the scale.
The "doughnut" (oil/water cooler) seems to work quite well, and we probably would better be monitoring water temps than oil temps. From what I gathered in reading this BBS for 3 odd years now, we don't need oil coolers at all in most states of tune.
I admit though that this is pure speculation as well, but I just don't think the engine failures are due to high oil temps. Pressure problems... maybe.
I also think the frail MAF's are scewing the numbers quite a bit... I am now conviced that the MY99/00 MAF's just die after 3 years, and are the reason for quite a few engines going haywire. But that doesn't explain the failures of people running Link/Motec/GEMS etc...
What we should concentrate on is the "just serviced" bit IMHO. I don't remember Bob posting any stats, but it seems to be a major issue. Maybe you missed that post, but my dealer had *exactly* the same thing. Serviced his own car on Saturday, went bang on the Sunday...
or an electrical spike causing the reading
Your temps don't seem to be very different from mine (once you sort yer brakes
), I don't trust those gauges up to 5°C's anyway, and I just don't have the gut feeling oil temps on the Impreza are way off the scale. The "doughnut" (oil/water cooler) seems to work quite well, and we probably would better be monitoring water temps than oil temps. From what I gathered in reading this BBS for 3 odd years now, we don't need oil coolers at all in most states of tune.
I admit though that this is pure speculation as well, but I just don't think the engine failures are due to high oil temps. Pressure problems... maybe.
I also think the frail MAF's are scewing the numbers quite a bit... I am now conviced that the MY99/00 MAF's just die after 3 years, and are the reason for quite a few engines going haywire. But that doesn't explain the failures of people running Link/Motec/GEMS etc...
What we should concentrate on is the "just serviced" bit IMHO. I don't remember Bob posting any stats, but it seems to be a major issue. Maybe you missed that post, but my dealer had *exactly* the same thing. Serviced his own car on Saturday, went bang on the Sunday...
06 November 2002, 06:00 PM
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1 MODEL
Impreza wrx import
2 YEAR
1995
3 MILES
40,000
4 FAILURE DESCRIPTION
Broke, big end number 3 shell
5 FAILURE DATE
April
6 MILES SINCE SERVICE
150ish
7 SERVICEB BY
Wouldnt like to say
8 OIL TYPE USED
Semi synthetic
9 FILTER TYPE USED
Genuine subaru
10 FILTER PRIMED PRIOR TO START
I doubt it
11 ENGINE PRIMED ON STARTER MOTOR
I doubt it
12 FUEL & ADDITIVES IN USE
Nope optimax
13 AMBIENT CONDITIONS AT FAILURE
Warm
14 ENGINE MODIFICATIONS / POWER
Apexi turbo, hks filter an zorst hks plugs should of been about 280ps
15 BOOST PRESSURE MAX HELD
0.8bar at time. Had run before 1 bar
16 TYPE OF USE NORMALLY
Driving? to from work and stuff
17 TYPE OF USE PRE FAILURE
Just came onto motorway from slip road gave it some.
18 MAX RPM USED IN GEARS
6,500
19 MAX RPM HELD TOP GEAR
6.500
20 DURATION OF MAX HELD IN TOP GEAR
About 15 seconds
Ok?
[Edited by cryptwalk - 6/11/2002 6:03:08 PM]
Impreza wrx import
2 YEAR
1995
3 MILES
40,000
4 FAILURE DESCRIPTION
Broke, big end number 3 shell
5 FAILURE DATE
April
6 MILES SINCE SERVICE
150ish
7 SERVICEB BY
Wouldnt like to say
8 OIL TYPE USED
Semi synthetic
9 FILTER TYPE USED
Genuine subaru
10 FILTER PRIMED PRIOR TO START
I doubt it
11 ENGINE PRIMED ON STARTER MOTOR
I doubt it
12 FUEL & ADDITIVES IN USE
Nope optimax
13 AMBIENT CONDITIONS AT FAILURE
Warm
14 ENGINE MODIFICATIONS / POWER
Apexi turbo, hks filter an zorst hks plugs should of been about 280ps
15 BOOST PRESSURE MAX HELD
0.8bar at time. Had run before 1 bar
16 TYPE OF USE NORMALLY
Driving? to from work and stuff
17 TYPE OF USE PRE FAILURE
Just came onto motorway from slip road gave it some.
18 MAX RPM USED IN GEARS
6,500
19 MAX RPM HELD TOP GEAR
6.500
20 DURATION OF MAX HELD IN TOP GEAR
About 15 seconds
Ok?
[Edited by cryptwalk - 6/11/2002 6:03:08 PM]
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