Well you call it any way you like but unless there is air in the oil in the sump or problems with the oil pump itself a wet sump system wont have that problem . Virtually all oil pumps , or on cheaped out engines oil filters , there is a spring loaded oil pressure relief valve so if there was a restriction downstream of the oil pump the pressure is regulated close to the pump .
I really cannot see how any downstream restriction would cause the oil pump to cavitate if everything is working as its supposed to .
I can see a dry sump scavange pump drawing some air out of the crank case with returning oil and it ending up in the oil tank - but you don't have a dry sump system .
Trust me I've seen automotive and industrial engines both diesel and petrol with external oil coolers and none of them have oil pump cavitation issues .
Cavitation issues with propellers means that the low pressure areas at the blade tips allows water to boil at lower temperatures and the hammer blows of the blades temporarily unloading is the major issue .
Anyway my Evo 6 has a factory fitted air/air oil cooler and 4G63Ts are not known for having oil airation problems . Everyone fits them to WRXs when they go rallying and they don't have any problems either .
A .
Which dual core(s) will fit in a 93 L Series?
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Gannon
- Senior Member
- Posts: 4580
- Joined: Sat Nov 05, 2005 10:00 am
- Location: Bowraville, Mid Nth Coast, NSW
Yeah I too am puzzled by how air can be introduced into oil when passed through an oil cooler?
Ive heard references to frothy oil coming out of the oil outlet of a turbo, hence its large (3/4 inch) size, but I am somewhat sceptical of this too. Maybe its in the definition of "frothy"
And oil pumps cant cavitate because they are a positive displacement pump.
Ive heard references to frothy oil coming out of the oil outlet of a turbo, hence its large (3/4 inch) size, but I am somewhat sceptical of this too. Maybe its in the definition of "frothy"
And oil pumps cant cavitate because they are a positive displacement pump.
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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discopotato03
- Senior Member
- Posts: 2134
- Joined: Sun Mar 18, 2007 9:29 am
- Location: Sydney
Thats true about turbocharger oil drains and the oil coming out like dirty whipped cream . This is because of the eighty plus thousand revs they can be doing and oil spinning off their bearings . BB turbos don't need as much oil as plain bearing ones because the bearings use all hardened surfaces .
The large drain tube is used because all you have is gravity to send it back to the sump in "froth" form .
The large drain tube is used because all you have is gravity to send it back to the sump in "froth" form .