Tuscan oil pressure when cold
Discussion
It depends on what oil you used as well. It sounds pretty normal. As quoted many times here before, check out http://www.mytuscan.co.uk/ it tells you pretty much everything you need to know about your Tuscan. Relax and enjoy the car. They are more solid than you think, just look after her and warm her up properly. Happy motoring!!
I just got round to checking the pressures on my car. I'm guessing there must be a big difference in the calibration of the measurement system and variations engine to engine. When started from cold the oil pressure on mine is around 70 psi and at 2500 rpm is around 75 psi. When it's fully warmed up at tick-over the pressure is 19 psi with around 60/65psi at 2500 rpm. The engine has done 27K and is currently using Mobil 15W40 racing oil.
I don't doubt what is said but I can't really get my head around the logic here. As I understand it the FFF cylinder head is a direct replacement for the standard part and does away with the finger follower design. Why does that raise the oil pressure so much? Do they alter the oil pressure relief valve spring rate?
BobE said:
I don't doubt what is said but I can't really get my head around the logic here. As I understand it the FFF cylinder head is a direct replacement for the standard part and does away with the finger follower design. Why does that raise the oil pressure so much? Do they alter the oil pressure relief valve spring rate?
The way the oil travels through the head is completely different.. You no longer have the follower shaft for a start. Its essentially completely re-engineered.m4tti said:
BobE said:
I don't doubt what is said but I can't really get my head around the logic here. As I understand it the FFF cylinder head is a direct replacement for the standard part and does away with the finger follower design. Why does that raise the oil pressure so much? Do they alter the oil pressure relief valve spring rate?
The way the oil travels through the head is completely different.. You no longer have the follower shaft for a start. Its essentially completely re-engineered.BobE said:
I understand that but how does it raise the oil pressure? Oil is fed to other areas of the engine as well and these are unchanged. I don't know what the setting is for the oil pressure relief valve but I would have thought it was either around or less than what is shown. It maybe counter-intuitive but I'd be slightly worried by the oil pressure going up like that as it could mean the oil flow is restricted in the head.
In the original design (simplistically) oil just falls out of lots of different holes in the head (you have the follower shaft, the followers etc ..Obviously the pressure drop is largely in the head.Its now being directed to where its required. Less exit points increase the pressure. Like putting your finger over the end of a hose. The Oil pressure relief valve isn't touched. The engine now runs at normal car oil pressures...
Edited by m4tti on Wednesday 13th August 14:05
High/low oil pressure!!!!!!!!!!!!!!!!!
The customer/operator should be just as concerned with high oil pressure as with low oil pressure. In fact any deviations, low or high, from "normal oil pressure" should be investigated.
Higher oil pressure means that more work has to be done to pump the oil around the engine and this loss of efficiency should be minimized. High oil pressure does not equate to good oil flow and in many cases it is an indication of the opposite.
Alteratively, lower oil pressure can mean that the oil is flowing rapidly around the engine which is a very desirable condition for minimizing wear.
Uwe
The customer/operator should be just as concerned with high oil pressure as with low oil pressure. In fact any deviations, low or high, from "normal oil pressure" should be investigated.
Higher oil pressure means that more work has to be done to pump the oil around the engine and this loss of efficiency should be minimized. High oil pressure does not equate to good oil flow and in many cases it is an indication of the opposite.
Alteratively, lower oil pressure can mean that the oil is flowing rapidly around the engine which is a very desirable condition for minimizing wear.
Uwe
Tuscanuwe said:
High/low oil pressure!!!!!!!!!!!!!!!!!
The customer/operator should be just as concerned with high oil pressure as with low oil pressure. In fact any deviations, low or high, from "normal oil pressure" should be investigated.
Higher oil pressure means that more work has to be done to pump the oil around the engine and this loss of efficiency should be minimized. High oil pressure does not equate to good oil flow and in many cases it is an indication of the opposite.
Alteratively, lower oil pressure can mean that the oil is flowing rapidly around the engine which is a very desirable condition for minimizing wear.
Uwe
Go look up cold start up oil pressures of modern engines. Think you'll find theyre between 80 - 100 psi The customer/operator should be just as concerned with high oil pressure as with low oil pressure. In fact any deviations, low or high, from "normal oil pressure" should be investigated.
Higher oil pressure means that more work has to be done to pump the oil around the engine and this loss of efficiency should be minimized. High oil pressure does not equate to good oil flow and in many cases it is an indication of the opposite.
Alteratively, lower oil pressure can mean that the oil is flowing rapidly around the engine which is a very desirable condition for minimizing wear.
Uwe
The hot oil pressure at idle is 30 psi. Again all inline with a modern engine.
The pump wont work any harder. It's driven off the crank, it's delivery is governed by the rpm of the crank and the viscosity of the oil.
Edited by m4tti on Wednesday 13th August 17:56
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