Next message: Jim: "Re: lv-ab: ER Casualty Two Follow-up"
In a message dated 6/15/2007 8:42:14 PM Central Daylight Time,
writes:
>
>
>
>
> "For those unfamiliar with Detroit Diesels, they require a blower to blow
> combustion air into the cylinders, they don't suck it in like other
> diesels. This blower is a Roots blower consisting of two lobed
> counter-rotating rotors in a housing, somewhat like a gear pump, which is
> driven by a shaft connecting from the gear train that drives the cam
> shafts. This is the shaft that shattered into two main pieces and two
> other bits."
>
> Norm,
> This is actually a supercharger, that Detroit diesels get the extra power.
> It is like a turbocharger but mechanically driven not by exhaust gases.
> The power is at all range of RPM unlike turbochargers that need to rev-up
> for the turbo to kick in and create about 7 psi boost.
>
Actually, it is a supercharger, but it is also a 2 cycle diesel. It will do
nothing without the supercharger. Every upstroke is a compression stroke, every
down stroke is a power stroke. At the bottom the exhaust is let out and the
new air is let in under pressure from the supercharger. Somewhat similar to
your 2 stroke outboard, but on the outboard, the crankcase serves the
supercharger function.
Gene Gruender
Sun Chaser
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