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No matter how long you let oil or coolant drain there's always plenty left.
Why?
For oil in particular it's because it "clings" to surfaces. One of the aspects of modern oil is that it will never, ever completely run off. And that's a very good thing.
There are also various passages, nooks crannies that don't "point down." (*)
There may also be lines running from the block to heat exchangers.
In the 991 there's a vacuum pump at the same level as the pan that doesn't drain.
Imagine 6 blenders, half-filled with oil, where the 'top' of the blender is a 3d-maze. Turn the blenders on. Then take the tops off an put them on the counter. Dump the containers and set them upside down on the counter.
The containers will drain except for a film. The "mazes" will never drain.
(*) And we know that there's a bunch of oil in the right-side turbo inlet hose
Here's a real world example.
This 928 motor, when the picture was taken had, had the oil drained for *years.*
Yet, you can still see drops of oil on the main bearing cap nuts and girdle bolt heads (and in the drip pan.)
If you drain a 928 engine, let it sit for weeks dripping, then turn it 90° on the engine stand it'll pour a quart of coolant and a pint of oil. If you then turn it back upright and 90° to the other side it'll pour out another quart of coolant and a pint of oil.
The only way to get all of the fluids out is to chemically clean *everything* touched by fluid.
A 928 radiator will drip coolant for weeks after it's drained (3d-maze inside.)
Which brings up another point: the 991 Turbo radiator is surprisingly small for the power output. No doubt a more efficient matrix and the fact that it's hanging out way in front in the bug stream rather than tucked under a svelt nose. Heh... I think I'll take a picture of them side-by-side in a bit.
That's interesting; I never thought that much stayed stuck to the bits and pieces, and short of the remaining film, I figured most volume would evacuate.
Also...how the heck did you get your radiators so clean?? I've used a combination of things before and still couldn't get them to look like yours! Great job. DDG thanks you!
You want The Truth?
<insert Jack Nicholson meme image>
Tools:
- Shop Vac
- Compressed Air
- My 'custom' D-Limonene-based cleaner
And these...
Center rad 1/3-cleaned (picture right)
Center rad cleaned
928 radiator compared to 991TT radiator
Technically those belong in a "What did you do to your 991 turbo yesterday?" thread.
Today, I had to do real work: Sorted out 1890 Cadmium Plated 928 parts (not all shown below). Next step is to sort them back into component-by-component bags for reassembly.
Today, I had to do real work: Sorted out 1890 Cadmium Plated 928 parts (not all shown below). Next step is to sort them back into component-by-component bags for reassembly.
05-20-2023, 07:51 PM
