> <<When Porsche went to water cooling, emissions played a large part in
> their decission. The air cooled engines were also expensive to build. The
> new engine remained a flat 6, and had the oil tank kind of build into it, so
> not a dry sump engine as in having it's own oil tank like in previous cars.
> I think some of the thinking was, fewer hoses, less parts, fewer things to
> break and leak, and simpler to make. I'm not sure how long the new engine
> was on the design board, but I'm sure porsche saw the changes coming. I'm
> not 100%, but I think some of the earlier air cooled race engines, like the
> 962 had the heads cooled by water. As far as I know, there were very few if
> any carry over parts from the older air cooled engine into the new water
> cooled 996 and boxter models. Again, can't say for certain as I haven't dug
> into one yet.>>
>
All true. The other factors were noise, since the aircooled engines at the
end had a tough time passing pass-by noise regs in Switzerland, as one example.
Plus, reliable 4-valve designs with variable valve timing that could be cooled
adequately and turbocharged without the old turbo problems. Well, almost.
But, Porsche, after twelve production years is still having engine problems
which they refuse to reveal or admit. Of course, the previous 993 models have
continuing problems which can be remedied at the owner's expense. Considerable
expense.
RLE
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