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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