Roger,
You are right about the continuous output factor. We really don't require
much hp from car engines except for short blasts of really high torque/hp.
That 40 hp tractor engine I referred to was a Minneapolis Moline U. These
babes were 4 cyl, (4.25X5, I think) and 283 cubes. They would lay into a
40-45 hp load at 1300 RPM all day long. Of course the engine probably
weighed half as much as an Alpine! Beautiful brutes.
Bill
----- Original Message -----
From: "Roger Gibbs" <rgibbs@pacbell.net>
To: "Bill Blue" <dablue@worldnet.att.net>
Cc: "ESPEN HOLM" <e_holm@c2i.net>; <alpines@autox.team.net>
Sent: Sunday, June 02, 2002 11:50 AM
Subject: Re: Manifold temperature
> HI Bill,
>
> Yeah, I had not considered the airflow over the manifold. This
> engine was in a closed room with no air flow.
>
> The dyno run that I watched was in 1978 or 1979. I probably
> was not real clear in what I wrote. The dyno run was for a bunch
> of guys who were attending a lecture on turbocharging. The dyno
> operator was using a stock Ford 4 cylinder turbo'd mule engine
> as a demonstration on a dyno run that lasted maybe 10 minutes.
> The engine was not run to maximum hp or torque. When the manifold
> began to glow red at what I thought was a low hp out (50 to 60 hp)
> the comments that followed included the statement that a steady
> state ouput of this level for several minutes continuously is pretty
> respectable. I don't rember the rated output of the 4 cylinder turbo
> in 1978, but I am pretty sure it was a lot lower than the 200 hp.
> It might matter that these guys were mostly developing turbo
> setups for long continous running applications and were less interested
> in the ability to produce short duration high output.
>
> -Roger
>
>
> Bill Blue wrote:
>
> > The air flow is evidently critical in the keeping manifold temp down.
BTW,
> > your dyno operator should check out a posting on the turboford.org site.
A
> > turbo 2.3 put out over 200 hp from 3800 to 6000 RPM, with a max of 246
at
> > about 4200. The interesting part is the torque - maxed out at 276
ft.lbs!
> > Bill
> > ----- Original Message -----
> > From: "Roger Gibbs" <rgibbs@pacbell.net>
> > To: "Bill Blue" <dablue@worldnet.att.net>
> > Cc: "ESPEN HOLM" <e_holm@c2i.net>; <alpines@autox.team.net>
> > Sent: Wednesday, May 22, 2002 8:34 PM
> > Subject: Re: Manifold temperature
> >
> > > Getting to my e-mail after a few days ....
> > >
> > > Yes, I watched a 4 cylinder Mustang engine glowing a dull red on a
dyno.
> > > Output ? - I think it was about 50 horsepower. I don't remember how
> > > long it took, maybe a minute or two at that output, before the
manifold
> > > started to glow, it was approaching cherry red when the engine run was
> > > stopped.
> > >
> > > I asked the dyno operator about this - I was surprised that such a
"low"
> > > horsepower output would cause the manifold to glow. He was not
surprised
> > > at the red hot manifold. He also pointed out that rerely is one able
to
> > get
> > > full output from an automotice engine for several minutes straight.
BTW,
> > > he also said that 50 or 60 true horsepower out of the box stock turbo
4
> > > cylinder was a respectable steady state output.
> > >
> > > -Roger
> > >
> > > Bill Blue wrote:
> > >
> > > > snip
> > >
> > > > I have never seen a car manifold glow
> > > > from heat. Has anyone?
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