it's there to restrict flow and help warm up your engine-that's the same
reason we have thermostats in our cars. Heating an engine up quicker helps
get rid of the carbon deposits we find in our motors, which is also why
short jaunts through the city where your motor never warms up aren't good
for it.
~dave
On Mon, 9 Apr 2001, Roger Howard wrote:
> List,
> In an effort to reply to Larry's question, I went out to the garage and
> checked out an exhaust manifold from a 318. The butterfly valve inside will
> "open" the passage about 1/3 if you turn the shaft counterclockwise, but the
> counterweight and spring are set up so that the valve is completely open
> when the shaft turns fully clockwise and a tang on the counterweight
> contacts a 'stop'.
> Larry says he lives in a warm climate and doesnt need this warmup feature.
> Larry seemed to think that this butterfly diverted hot exhaust from the one
> exhaust manifold back thru the intake manifold and over to the other exhaust
> manifold. Is this correct? I thought the valve just basically restricted the
> speedy exit of the hot exhaust, thereby spreading heat thruout the engine
> block. Eventually, the heat warmed the thermostatic spring, which rotates
> the valve open. At the same time, the spring-controlled carb choke had
> warmed and opened, and now your engine was all warmed up and running smooth
> as silk..
> RogerH
> ----- Original Message -----
> From: "larry gardinier" <gardinier@xxxxxxxxxxxxxx>
> To: <L-FORWARDLOOK@xxxxxxxxxxxxx>
> Sent: Sunday, April 08, 2001 10:41 AM
> Subject: [FWDLK] exhaust manifold butterfly
>
>
> > I took my 58 Savoy out for it's maiden voyage the other day. It drove
> > nice but after a couple miles it overheated. The hoses look new, the
> > waterpump is new and the belt is fine. After the car cooled down
> > overnight I started it up and felt the intake manifold, it was hot
> > around the choke and cool around the intake ports. The butterfly was
> > definitly frozen, I've since loosened it up with some penetrating oil
> > and I want it to stay open. Question is, What's open? All the way
> > clockwise? or all the way counter-clockwise?
> > Thanks to all,
> > Larry Gardinier
> >
>
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