Re: [AMC-list] How much HP to drive an oil pump ???

[tom jennings <tomj@xxxxxxx>]

I think Smokey Yunick found that at high speeds fully half the oil supply
was "up in the air" hence not available to be circulated and could/did leave
to oil starvation and destruction. I think power consumption issues is
secondary to welding journals!



On Mon, Jun 22, 2009 at 16:14, Armand Eshleman <aje1@xxxxxxxxxxxxxxx> wrote:

> Dry sump systems scavenge the oil out of the crankcase and put it into a
> storage tank. Most external oil pumps have several stages of pressure and
> scavenging.The external pump probably uses the same amount of power to
> drive
> as a standard type pump. The big advantage is the oil isn't in contact with
> the crankshaft and rods and being whipped into froth by them, which
> consumes
> power. The oil is removed from that area by the scavenge stages of the pump
> before that can happen.
>
> The oil pressure can be pumped up before you fire the engine in only the
> same ways as a standard pump. Either the engine has to be turned over by
> the
> starter before the ignition circuit is switched on or the drive system has
> to be disconnected and a remote drive utilized to operate the pump (like a
> drill motor and shaft to the standard pump). I think what Dan is referring
> to prevent oil starvation is called an Accusump. This device stores the oil
> under pressure and then can be released into the oiling system right at
> startup or even when under hard cornering or when the oil pickup becomes
> uncovered and possible oil starvation (wet sump systems only, dry sumps do
> not normally suffer from this problem). An external pump (dry sump) cannot
> do this on it's own.
> Common accepted horsepower increases from wet sump to dry sump systems are
> about 15.
> The Formula Ford race car I owned was equipped with a dry sump system that
> was driven off a belt from the crankshaft pulley. The only way to "pre" oil
> the engine was to turn the engine over with the starter until pressure
> built
> up and then kick on the ignition switch.
> Hope this helps answer some questions,
> Armand
>
> ----- Original Message -----
> From: "dan whitehead" <freebird_58@xxxxxxxxxxx>
> To: "amc list" <amc-list@xxxxxxxxxxxx>
> Sent: Monday, June 22, 2009 8:59 AM
> Subject: Re: [AMC-list] How much HP to drive an oil pump ???
>
>
>
> I think the dry sump systems are worth more because they eliminate the
> excess oil in the pan which creates drag on the crank.  That's why a
> windage
> tray should be used between the oil pan and crank.  One nice thing about a
> dry sump system is the oil pressure can be pumped up prior to starting the
> engine, hence no oil starvation.  That is a great question tho, one I've
> never thought about.
>
>
>
> Dan Whitehead
>
>
> Hey Dean,
> I honestly don't know the answer and have not heard it discussed before.?
> On
> race engines, I think that a belt-driven dry sump system can be worth 50+
> HP
> over a wet-sump system.?
> ?
> Perhaps one of the AMC racers over on the AMC-List know the REAL answer to
> your question.? I'll CC this email over there.
>
>
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-- 
All of your arguments are invalid.
Enjoy your unstable system.
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