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Oil Pressure And Temperature Sensors

Roy

By Roy,
in Engines & Forced Induction

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Roy Grand Master

Roy

Posted
Posted

Firstly oil temp. I am rewiring a bunch of meters, and i always thought you wanted to measure the temp of oil in the sump. So in my case i would place the temp sensor after the oil cooler, so i get an idea of the temp of oil the engine is about to ingest.

Now a friend was sayign recently that his mechanic had it on the oil line to the cooler so you read the temp of the oil coming out of the engine.

So anyones thoughts on who is right or why they plumb theirs a certain way.

Also with the oil pressure sensor, does anyone know the thread size? I was going to plun my new VDO sensor in the location of the std sensor. Can you just run a t-piece in the oil cooler lines??? Doenst seem ideal but would make life easier during the insall

Craved Grand Master

Craved

Posted
Posted

you measure water temp after it leaves the engine ....

i would think the same applies to oil temps

but then again, nearly everyone says sump to me aswell. other than people who have the sandwich plates and they just use them without knowing whether its in or out feed

Omurru Veteran

Omurru

Posted
Posted

Not sure with piston engines but I know with turbine engines the sensor is generally on the scavenge side of the system, so between engine out and the cooler, it's said this indicates failure more quickly. Makes sense to me that it would work the same way with cars.....

Measuring from a t-piece isn't the best solution as this creates a restriction in the flow, better if you can use an inline sensor.....

Roy Grand Master

Roy

Posted
  • Author
Posted

Well i will probably end up just teeing into the std location and running some 1/8" tube or something to the inner guard where i will mount it.

msi-press.jpg

The vibration is meant to hurt then if you mount them direct to the engine hence my wanting to use a tpiece into the cooler line...also helps with access

Beer Baron Grand Master

Beer Baron

Posted
Posted

i just mounted the sensors for my defi gauges (oil pres, oil temp) both into the side of the greddy remote filter mount.

on the afla we run a line (braided) from the standard location up to a little 'bar' which is milled from a billet. it has a hole in each end (one is blocked, one has the feed) then 3 holes in the top. One has pressure sensor, one temp, one warning buzzer sensor. It is basically a little fuel rail. very neat way to do it, and it means we can mount it on the firewall so the wiring is away from all the hot stuff. and it's all easy to access.

Craved Grand Master

Craved

Posted
Posted
i just mounted the sensors for my defi gauges (oil pres, oil temp) both into the side of the greddy remote filter mount.

on the afla we run a line (braided) from the standard location up to a little 'bar' which is milled from a billet. it has a hole in each end (one is blocked, one has the feed) then 3 holes in the top. One has pressure sensor, one temp, one warning buzzer sensor. It is basically a little fuel rail. very neat way to do it, and it means we can mount it on the firewall so the wiring is away from all the hot stuff. and it's all easy to access.

wouldn't the temp one lag with this not being a flow through type setup ??

once the line is primed wouldnt the oil that is there to start with not be removed from its place if its pressurised ?? hence taking a long time to heat up since it isnt passing through the engine.

just thinking of the path of least resistance..

  • 3 weeks later...
thommo Mentor

thommo

Posted
Posted

in addition to the above, can anyone help me out regarding the method of changing the oil pressure sender on an R33?

I have the new sender and can see where the plug goes into the old one, just need to know how to go about changing it or whether it is best left to a mechanic. don't want oil to be spilling out all over the place if i remove it.

this is a requirement of a RWC and i kinda need this sorted this afternoon!

any help hugely appreciated.

(apologies for posting in 2 sections, need an answer asap)

Beer Baron Grand Master

Beer Baron

Posted
Posted
wouldn't the temp one lag with this not being a flow through type setup ??

once the line is primed wouldnt the oil that is there to start with not be removed from its place if its pressurised ?? hence taking a long time to heat up since it isnt passing through the engine.

just thinking of the path of least resistance..

nah, the oil is definately flowing through there. oil temp is responsive enough, oil pressure is really responsive too. it's amazing how much faster it works than the stock gauge, though at a constant reading their values are very close.

tommo, are you sure oil pressure guage is a RWC requirement? most cars dont even have one.

thommo Mentor

thommo

Posted
Posted (edited)
tommo, are you sure oil pressure guage is a RWC requirement? most cars dont even have one.

sorry, it's not the actual guage, he sighted "oil around oil pressure switch (sender)", possibly from me spilling a little oil when changing the filter last. only item on his list other than stock airbox ;)

thought fair enough, rang up bursons and got the part, but now the mechanic is too busy to fit it this arvo.

buyer is flying in tonight and driving back to the ACT, so i'm kinda in a bit of a hurry

Edited by thommo
Duncan Grand Master

Duncan

Posted
Posted

I'm about to do what Beer Baron did, was going to tap it into the sump but the guys at Motorsport Connections said that a t to a remote location on the chasis is fine and very common

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