Check your fan clutch, Mike, before you go off on a wild goose chase. High
speed driving will cause the engine to heat up. I know this is
counter-intuitive, but I've seen it enough times to believe it. Apparently
the aerodynamics are such that too much air gets around instead of through
the radiator if the fan isn't doing it's job. Of course there is a lot more
heat rejection at high speeds also (that extra gas goes partly into heat).
Another cause of high speed overheating is the lack of an anti-collapse
spring in the lower radiator hose. The average gas station mechanic
doesn't know much about physics, and discards that spring when replacing the
lower hose. It is important - the water pump inlet side can actually go way
below atmospheric at high RPM.
So squeeze your hose to see if you can feel its ribs. If you can't - you've
found your problem.
Dick Benjamin
----- Original Message -----
From: "Mike Pittinaro" <mechimike@xxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Tuesday, June 15, 2004 12:57 PM
Subject: Re: IML: '68 running warm <--my '67, too!
> > 68) - I temporarily bent up some coathangers from
> > the motel closet to force
> > the blades to turn with the pulley all the time.
> > Noisy as hell, but it sure cooled the engine down!
> >
> > Dick Benjamin
>
> Dick Benjamin, or MacGeyver...you be the judge!
>
> On a serious note, I've noticed my own '67 running a
> bit on the warm side now that the daytime temps in our
> nation's capital have broken the 90 degree mark. At
> idle, its fine, however the faster I go, the warmer
> the needle registers. This seems counter-intuitive,
> since there would be more air rushing past the
> radiator at, say, 90 than at a stoplight (Not that I
> EVER drive 90...no, not me.) At idle, the gauge will
> return to and sit at the mark indicating the bottom of
> the "operating range" on the gauge, but above 55 or so
> it will begin climbing. It stays within the
> "operating range" but gets into the top 1/3 of it,
> which I consider a bit too warm. My old '67 would
> stay in the same place regardless of driving
> conditions.
>
> My own thoughts tend towards something wrong with the
> engine itself, ie timing wrong, plugs, mixture, etc,
> rather than a defect in the cooling system. Am I on
> the right track here?
>
> =====
> --Mike Pittinaro
>
> One point eight litres
> Stromberg carburators sing
> Loose nut at the wheel
>
>
>
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