Pinking problem causing high oil temp? - RESULT!!

[cняis]

Hi guys.

My car has been suffering from what i assume is "pinking" or detonation/pre-ignotion (whatever!) for the last few months, although its not bad enough to cause any stuttering or misfire. If put under load, whilst the engine is warm (or hot!), it makes a horrible erratic *tinging* sound. Timing and CO is being sorted on Friday, so hopefully it will go away.

Just one question though:

I did approx 150 motorway miles today, and at a steady 65-70mph, oil temp in my 8v digi was around 94-96. Take it up to a steady 75-80mph and it rose to 100-102. Is this normal? I found myself slowing right down to get it to cool down again. I was not ragging it, just cruising along nicely. At that rate i daren't exceed 80mph. Is this temperature excessive and could the pinking be causing the excess oil temp? if not could it be the oil cooler?

n.b. water temp was fine, so rad fan and water levels are ok.

[DarnPB]

The oil temp can vary with the type of oil you have and also the quantity. If the level is low, then it will run hotter. Hot oil would not cause pinking, rather the other way round. If the engine is pinking excessively, then the cylinder head temps will rise. Oil not only lubricates, but also take heat away.
Get the engine tuned first, do an oil change then see what oil temps you get then. If the temps start going over 110, then investigate further, although there will be others who will think this figure is too high.

[cняis]

thanks...

Oil is fully synth 10w40, changed about 1500 miles ago with new filter. it was changed prior to that with 10w40 fully synth about 5k miles before, with an engine flush.

i checked the oil and coolant this morning, coolant was on max and oil was about 3/4 way up. i did not top it up to max as honestly i was in a hurry, i sadly had a berievement in the family last night so had to visit family this morning.

[Dragon6]

I would say your timing could be slightly out this would cause the pinking my G60 was doing it slightly the other week had timing etc set up all is fine now.noticed it  when engine was up to full working temp and you put load on the engine ie going into 4th at low revs and putting your foot down,go steady though as pinking isnt really a good thing and can shaft your engine in extreme cases as it is unburnt fuel being burnt at the wrong time in the cycle the pinking you can hear is shockwaves in the cylinder (in a rough description LOL) .I wouldnt say your oil temp is all that high at motorway speeds certanley nothing to worry about just keep your eye on it..

[Dragon6]

I would say your timing could be slightly out this would cause the pinking my G60 was doing it slightly the other week had timing etc set up all is fine now.noticed it  when engine was up to full working temp and you put load on the engine ie going into 4th at low revs and putting your foot down,go steady though as pinking isnt really a good thing and can shaft your engine in extreme cases as it is unburnt fuel being burnt at the wrong time in the cycle the pinking you can hear is shockwaves in the cylinder (in a rough description LOL) .I wouldnt say your oil temp is all that high at motorway speeds certainly  nothing to worry about just keep your eye on it..

[cняis]

I would say your timing could be slightly out this would cause the pinking my G60 was doing it slightly the other week had timing etc set up all is fine now.noticed it  when engine was up to full working temp and you put load on the engine ie going into 4th at low revs and putting your foot down,go steady though as pinking isnt really a good thing and can shaft your engine in extreme cases as it is unburnt fuel being burnt at the wrong time in the cycle the pinking you can hear is shockwaves in the cylinder (in a rough description LOL) .I wouldnt say your oil temp is all that high at motorway speeds certanley nothing to worry about just keep your eye on it..

ok matey, thank you!

[Organisys]

If your car is an 8v digfant, it has a knock sensor. if getting the timing done doesn't fix the problem, ask garage to consider replacing it.

[cняis]

thanks, i will bear that in mind.

also i need the oil cooler looking at as it seems to be weeping a bit, maybe it wants a new gasket.

[cняis]

RESULT!

had the timing and CO done today, the new garage i took it to were very helpful, printed off the 8v tuning guide (thanks rubjonny) and hey presto. instantly smoother right through the rev band, much better idle and almost no pinking - it makes the noise very rarely, rather than right up the rev band, anyway im happy with it (could it be the 97 RON unleaded?)

there were a couple of point made by the garage though -
* the CO mixture was far too lean, i.e. under 0.2! this has been adjusted.
* the spark plugs, although only 6 months old, were absolutley knackered due to pinking etc
* the cylinders are a bit coked up (what can i do to de-coke them?)
* someone had fitted the flywheel in the wrong place so they had fun trying to find the timing marks!
* blue temp sender and knock sensor were both ok
* at my discretion the timing was set at the suggested 2-2.5k rpm, although normally the garage would have done it at idle


PLUS... it still returns 40mpg on a spirited drive 

[Organisys]

sweet. timing set at 2k ish is correct.

try shell or BP 89/99 RON petrol and she will fly.