Matt.....
Another cause of engines running hotter at speed than at idle is a defective
vacuum advance unit. The engine needs more advance at a steady high speed;
if the vacuum unit is defective, the engine will run retarded which makes it
run hotter than it should.
To check, remove the distributor cap, disconnect - at the manifold end -
the line that goes from the vacuum unit to the intake manifold, then either
suck very hard or use a vacuum pump to pull a vacuum on that line. When
doing so, you should see the distributor base plate (where the points are
mounted) rotate clockwise. If it doesn't, either your source of vacuum isn't
strong enough or your vacuum unit is shot.
Lawrie
British Sportscar Center
(who is really proud of himself for not mentioning Monica in this
post.............)
-----Original Message-----
From: Kulka, Matt <Matt.Kulka@hboc.com>
To: 'mgs@autox.team.net' <mgs@autox.team.net>
Date: Friday, October 02, 1998 7:19 AM
Subject: Motor hot at high speed - Was "new question???"
>Y'know, I'm experiencing the opposite problem in my '74 B. With ambient
>temperatures in the 90's, I can sit in traffic all day and the temp needle
>won't budge from the middle of the 'N.' If I hit the highway and do 65 mph
>or more for any amount of time, the needle creeps up about halfway between
N
>and H. When I get off the highway, I can drive for miles at lower speeds,
>and the car will barely cool down (until it's shut off for awhile).
>
>I'm guessing the corrosion in the radiator isn't letting the coolant
>exchange heat when it moves through there too fast. My daily commute is
all
>2-lane roads, so I seldom get on the interstate, so fortunately this
problem
>doesn't bother me much.
>
>Any opinions?
>
>Matt Kulka
>'74 B
>
>(A late thought. My throttle shafts are sucking wind. I wonder if that's
>causing lean running at high speeds, making the motor run hotter?)
>
>> -----Original Message-----
>> From: MYLDN@aol.com [mailto:MYLDN@aol.com]
>> ok, now that my dash pot oil question has been hashed out, my
>> next question is
>> about temp. my 73B runs at normal durring all hiway driving.
>> but any time I
>> get into any city stop and go traffic it creeps up untill
>> close to the dreeded
>> hot mark. the radiater has been replaced with a new one with a larger
>> capacity. the rest SEEMS to be ok. it will cool down ok as
>> soon as I can run
>> it at higher speeds. our local temp has been in the 80's not
>> that bad.mixture
>> is about 50/50. I bought a 165 thermostat but havent
>> installed yet, should I?
>> any better Ideas??????
>>
>
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