Most gasoline turbo motors don't even get into a boost condition until you
get over 3000rpm
and in the real world David has been exactly correct. VW lost a Class
Action suit over turbo engine failures and Subaru needs to be sued over all
their very expensive engine failures. I
have not looked at the torque curve of the Ford engine being discussed but
I would guess
peak torque is around 3800rpm, thats where it is on their V-10 truck engine
believe it or not!
Steve
On Sat, Mar 3, 2012 at 12:01 PM, Oliver Filippi <ofilippi@roadrunner.com>wrote:
> **
>
>
> David,
>
> Your logic is, for the most part, incorrect. My following comments are
> based on a dialog I had, many years ago, with a Chevrolet fuel induction
> engineer who played a key role in the development of the Turbocharged
> Corvair in the mid 60s:
>
> You are absolutely correct in your specifying synthetic oil for the turbo
> charged engine. The reason is that the turbocharger (as opposed to an
> engine driven supercharger) is mounted on the exhaust manifold (one of the
> hottest parst of the engine). Engine oil circulates through the
> turbocharger
> bearings (mounted on the exhaust manifold). This acts like a "flash oil
> cooker." Synthetic oil can take the heat much better than mineral oils, so
> it maintains its lubricating qualities (as opposed to circulating "cooked"
> and compromised mineral oil through the engine).
>
> Stresses on the engine are another matter, and the reality is
> couterintuitive. The biggest load and stress on a piston engine is caused,
> not by turbo boost, but by elevated RPM. The faster the enging turns, the
> faster the reciprocating parts have to move, start and stop.
>
> With a turbocharger, the engine produces more power at LOWER RPMs, compared
> to a conventionally aspirated engine producing comparable power. Therefore,
> if the driver does not over rev the engine, the turbo charged one will
> actually last longer. Modern, computer electronic engine management systems
> can also keep the engine running in a low stress manner.
>
> Oliver Filippi
>
>
> [Non-text portions of this message have been removed]
>
>
>
[Non-text portions of this message have been removed]
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