In a message dated 2/15/2007 8:47:59 AM Central Standard Time,
tr3driver@ca.rr.com writes:
> >Now that you mention it, someone told me about that. They said all the
> cars
> >were recalled and the water injection was removed and the cars were detuned
>
> Interesting. I hadn't heard that, and I used to be on a mailserve for
> owners of
> those cars.
And what I was told may have been just another urban legend.
>
> >He ascribed the problem to owners
> >failing to keep the water reservoir filled.
>
> The reservoir was equipped with a sensor, that was supposed to disable the
> boost
> entirely when the level was low. Sensor failures were one of the problems
> ...
>
> >And what does one do in freezing weather? Mix in ethanol? That would
> lower
> >the freezing point but it would also add fuel to the mix and with a
> >carburettor setup difficult to compensate for.
>
> GM dealt with that by specifying that only "GM boost fluid" was to be used,
> which (so I've heard) was available only by special order from an Oldsmobile
> dealer. The formula of the boost fluid was a secret (but likely just
> ethanol or
> methanol and water, plus some dye and whatnot). The boost fluid only flowed
> when the manifold pressure went positive anyway, so I doubt they worried
> about
> the mixture going rich from the extra fuel ... rich mixture is a good idea
> under
> boost anyway as it helps hold down combustion temperatures.
I had a turbo Mustang and thought about using a fuel injector for water
injection in lieu of the spark retard device they used.
But a propos to using water injection with high compression ratios in TR's
(without boost) it becomes a more constant issue. Perhaps it is only needed
under heavy throttle which puts it back into the boost situation but if it is
needed during cruise then running water when warm and water/ethanol when cold
could be an issue. Running water/ethanol at all times is one way to resolve
that
but more costly. But if you mix your own ethanol is pretty cheap.
Most of us are running 10% ethanol anyway.
Dave
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