WBX

[itchyfeet]

WBX tend to burn more oil if you keep it at the top, it may have something to do with the fact that 99% of us have a broken breather tower.

[bigbadbob76]

pop a 80 (instead of 87) degree thermostat in for £6 and let the radiator do the work of cooling.

Any chance of a link to where you got yours 007?
Cheers.
BBB.

[DoubleOSeven]

https://www.brickwerks.co.uk/thermostat ... -80-c.html" onclick="window.open(this.href);return false;

[itchyfeet]

I had one in in winter and was told it stoped the engine getting warm enough so I took it out., can't really be arsed swapping it twice a year.

I have had mixed views on what oil temperture should be some people say cool oil is bad for your engine some say it's OK at 80 degC as some thermostatic oil coolers maintan that temp

dunno who to believe but one this is for sure if you don''t have a reliable oil temp gauge you have no idea whats really happening.

[Cobra88]

7 degrees is not going to make it run too cold in the winter

I just put an 80 in mine and its much better running as original opens at same temp as fan switch
Operates so temp is up and down

After fitting 80 it sits right in the middle of the gauge right where i want it

Rick

[bigbadbob76]

Sounds good to me Rick.
I'll try it and see, maybe use a radiator baffle in winter if it's running too cold.

[Cobra88]

Agreed

Can always cover a bit of the rad but im not sure we would need to

Definately improved my oil temp since i changed it.

Regards
Rick

[silverbullet]

All of which begs the question: why did VW spec the 87 degree stat?
To ensure that the oil gets hot enough to evaporate the condensation and unburned fuel that gets past the piston rings at every cold start...

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[itchyfeet]

All of which begs the question: why did VW spec the 87 degree stat?
To ensure that the oil gets hot enough to evaporate the condensation and unburned fuel that gets past the piston rings at every cold start...

Sent from my S60 using Tapatalk

Yep this is what I'm led to believe so why are oil coolers thermostatted to 80degC
perhaps the oil in the sump is higher because its just been through the engine with an 80 degC oil cooler stat so hot enough to burn off nasties

[itchyfeet]

Just been reading the engine creates the same weight of water as the weight of fuel burnt and that having the right oil temp is vitally important to remove water from oil
if oil is not 100 degress + water mixes with sulphur and creates acids.

not 100% sure but I think lpg combustion generates more water than petrol
my tin top with lpg suffers some mayo in winter in the breather tower I wonder if this is why?

[bigbadbob76]

Just been reading the engine creates the same weight of water as the weight of fuel burnt.

Sounds believable but shouldn't the water be blown out with the exhaust?

[itchyfeet]

Just been reading the engine creates the same weight of water as the weight of fuel burnt.

Sounds believable but shouldn't the water be blown out with the exhaust?

yep but some goes past rings into sump it seems rings are not a perfect seal

[937carrera]

Do you remember this posting ?

Alright you asked for it, simple version (nicked, not checked)

2 C8H18 (petrol) + 25 O2 = 16 CO2 + 18H2O

Of course petrol is a blend of different chain length hydrocarbons and other components and additives, so it's a damn sight more complex than this in reality

Now spell stoykimetrik

That's why cold engines have a visible exhaust, water vapour shows where the exhaust gases are, hot engines don't as the water is in the gas phase, aka steam.

Any combustion gases going past the rings will contain water in the gas phase, whether it stays as steam or condenses back to water depends on the temperature of the crankcase, and then on the next combustion cycle the crankcase air is drawn back into the combustion chamber and forms part of the exhaust gases for the next cycle. In other words it isn't a constant fill into the crankcase / sump, there's a hole in the bucket too, dear Liza.

[silverbullet]

Yep this is what I'm led to believe so why are oil coolers thermostatted to 80degC
perhaps the oil in the sump is higher because its just been through the engine with an 80 degC oil cooler stat so hot enough to burn off nasties

I would surmise that it is so the oil can actually get hot enough (allowing for some thermal lag in the oil thermostat) before the stat can start circulating oil through the cooler.
Also, because oilstats are mostly used in race or motorsport applications where temperatures are significantly elevated for longer periods of time, when compared to road use?
It is possible to get 100C capsules as a spare from Mocal/Think Automotive for their remote unit.

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[itchyfeet]

Yep baffle us with science was my answer If I remember 937

VW chose 87 thermostat to keep oil at close to 100
not a coincidence its the boiling point of water imo.

Because I now have a filler cap on my breather tower I can remove it and you get a visible stream of something boiling off.