[s-cars] Oil Cooler Pics posted...

[Paul Friedenberg]

Yes, teddy,

The unit is designed for oil, but the charger company decided to use it for
water. Don't ask me why.

I am not at all concerned with the rubber lines, their rating far exceeds
any pressure that the oil system would produce, even a cold start. Audi used
steel braided lines because they could, and they (the Germans) love to
overengineer everything. Rubber oil lines have been used for years
successfully by many manufacturers and individuals. Besides, the most
compelling arguement for rubber lines is-- You guessed it, Hap uses
rubber(lines that is)!

The temps that I see on a hot day, at high speeds, is comprable to what you
would see with a normal oil cooler on a winter day, at non highway speeds,
ie the first tick mark, for lack of better terms. I cannot give you a number
for this value.

Paul


>paul,
>
>i'm not quite sure what you're saying, but this thing looks like an oil
>cooler to me.  they probably took it and used it for water.  i definitely
>wouldn't want to take a heat exchanger designed for water and use it in
>an oiling system without doing some checking first.
>
>the viscosities of oil and water are different.  i don't know if you
>can take a heat exchanger meant for water and use it for oil.  it
>depends on the particular heat exchanger.  another issue is whether
>the heat exchanger is designed to withstand the higher pressures seen
>in an oiling system.  the cooling system doesn't see much more than
>16-24 psi.  the oiling system, on the other hand, sees 30 psi (2 bar)
>at idle when warm and 90 psi (6 bar) above idle.  i'm sure the pressure
>spikes higher than that when you start the engine.  radiators aren't
>built to withstand those kinds of pressures.  even if it holds together
>the first few times, that's no guarantee that it won't blow up the 100th
>time you start the engine.
>
>i'd also be concerned about the rubber lines and hose clamps.  oil is
>the lifeblood of your engine, and rubber hoses have been known to blow
>up with pressure spikes.  i'd much rather use braided stainless steel
>hose with screw-in fittings, such as AN fittings or NPT fittings.
>
>and if you blow it up at speed, you could wind up oiling your tires
>and stuffing the car into a wall.
>
>so what temperatures are you seeing for the oil?  oil should be around
>220-240 degrees F.  if you're not going above the first tick mark,
>which is 60 degrees C or 140 degrees F, the oil isn't hot enough.
>i would install a thermostat if that's the case.
>
>-teddy
>
>
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