Oil pressure on track!
Discussion
I've only done two TDs with the 5.5 but both times I have noticed that when the engine is really hot, (not overheating) you are mainly at higher revs, tyres are nice and sticky and the G force in bends is at max, oil pressure drops to about 10 psi according go the tiv gauge. The pressure recovers immediately when accelerating out of the bends.
This is when de accelerated and cornering very hard.
This didn't seem an issue with the 4.6 that had a very simple home made baffled sump but an oil cooler 4 times the size of the 5.5s piddly one.
I believe that when the engine is very hot and the oil is like water the problem is exacerbated.
Question. Is it true that if a huge oil cooler is fitted, oil pressure decreases as the pump needs to pump the oil further?
If not then i'll try a much bigger cooler.
Should a Laminova oil/ water cooler be better? Always dubious about these as to layman's thinking, how can this cool the oil more efficiently then a big air cooler.
Or will I have to shell out about 350 squid on a JE baffled sump?
Your input much appreciated.
This is when de accelerated and cornering very hard.
This didn't seem an issue with the 4.6 that had a very simple home made baffled sump but an oil cooler 4 times the size of the 5.5s piddly one.
I believe that when the engine is very hot and the oil is like water the problem is exacerbated.
Question. Is it true that if a huge oil cooler is fitted, oil pressure decreases as the pump needs to pump the oil further?
If not then i'll try a much bigger cooler.
Should a Laminova oil/ water cooler be better? Always dubious about these as to layman's thinking, how can this cool the oil more efficiently then a big air cooler.
Or will I have to shell out about 350 squid on a JE baffled sump?
Your input much appreciated.
slippery said:
You know much more about these things than me Peter, but if your oil pressure is recovering once you're out of the bends, the baffled sump should do the job should it not?
Possibly but as said, I'm not sure if the big cooler helps?Also, if large coolers lower pressure then I would shy away from that possible solution.
BTW, missed you somehow on Saturday, ( as in, "didn't see you"
).slippery said:
You know much more about these things than me Peter, but if your oil pressure is recovering once you're out of the bends, the baffled sump should do the job should it not?
Possibly but as said, I'm not sure if the big cooler helps?Also, if large coolers lower pressure then I would shy away from that possible solution.
BTW, missed you somehow on Saturday, ( as in, "didn't see you"
).phazed said:
slippery said:
You know much more about these things than me Peter, but if your oil pressure is recovering once you're out of the bends, the baffled sump should do the job should it not?
Possibly but as said, I'm not sure if the big cooler helps?Also, if large coolers lower pressure then I would shy away from that possible solution.
BTW, missed you somehow on Saturday, ( as in, "didn't see you"
).phazed said:
Discopotatoes said:
But the oil stays cooler and thicker so pressure is up
This is my theory!I use a drop of this which works a treat
http://www.lucasoil.co.uk/products.php?page=produc...
Edited by Discopotatoes on Sunday 9th February 23:30
phazed said:
It would be hood to hear diffinitively about possible pressure loss?
If I do go that way, what a pain to get the cooler in with the later front end. Looks like a radiator out job!
If I do go that way, what a pain to get the cooler in with the later front end. Looks like a radiator out job!
This is my cooler, with the recommended amount of lucas I get a constant 55 psi on the gauge only dropping on tickover to 25
So how much extra oil do you need in the system with a funky oil cooler, I suppose you could work out the extra weight and pressure drop from the extra lines etc. thing is if your oil is cooler the pressure drop has less relevance ,,,,,,, or does it!
I can't imagine the drop is much anyway. Surely the mechanical pump can cope.
I wish I knew a few answers rather than questions.
I can't imagine the drop is much anyway. Surely the mechanical pump can cope.
I wish I knew a few answers rather than questions.
phazed said:
I get similar pressure using it on the road but the track really effects the oil.
When I had a temp gauge on the 4.6, the oil temp on road followed the water temp pretty much.
On track the water temp was about 75 degrees but oil temp would go up to 110 degrees!
Then that's screaming out for a bigger cooler When I had a temp gauge on the 4.6, the oil temp on road followed the water temp pretty much.
On track the water temp was about 75 degrees but oil temp would go up to 110 degrees!
Edited by Discopotatoes on Sunday 9th February 23:52
Discopotatoes said:
phazed said:
I get similar pressure using it on the road but the track really effects the oil.
When I had a temp gauge on the 4.6, the oil temp on road followed the water temp pretty much.
On track the water temp was about 75 degrees but oil temp would go up to 110 degrees!
Then that's screaming out for a bigger cooler When I had a temp gauge on the 4.6, the oil temp on road followed the water temp pretty much.
On track the water temp was about 75 degrees but oil temp would go up to 110 degrees!
Edited by Discopotatoes on Sunday 9th February 23:52
phazed said:
Discopotatoes said:
phazed said:
I get similar pressure using it on the road but the track really effects the oil.
When I had a temp gauge on the 4.6, the oil temp on road followed the water temp pretty much.
On track the water temp was about 75 degrees but oil temp would go up to 110 degrees!
Then that's screaming out for a bigger cooler When I had a temp gauge on the 4.6, the oil temp on road followed the water temp pretty much.
On track the water temp was about 75 degrees but oil temp would go up to 110 degrees!
Edited by Discopotatoes on Sunday 9th February 23:52
Have a read up on the lucas stuff, I use it in diff and gearbox too, great stuff IMO
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