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1995 Honda Accord boils over
Honda/Acura Vehicles Discussion group for Honda/Acura vehicles. (alt.autos.honda)
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#11
 
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Re: 1995 Honda Accord boils over -
05-01-2007
, 10:57 PM
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Hachiroku $B%O%A%m%/ wrote: On Tue, 01 May 2007 17:21:57 +0000, Grumpy AuContraire wrote: Hachiroku ハチ*ク wrote: On Mon, 30 Apr 2007 20:24:24 -0700, jim beam wrote: snip the fans don't work on the highway - airflow from car movement exceeds airflow from fan rotation by a country mile. if you were boiling, you had airflow restriction, thermostat problems or a gasket problem. LOL! You come to Mass on a hot July day, and I'll take you for a ride. At 70MPH on the highway, when the fan kicks in it sounds like a B-17 trying to pass you! Oh, yeah, the fan kicks in! (It's attached to the crankshaft...not electric, and uses a heat-sensitive oil that thickens when hot and causes the fan to be driven, rather than just 'feathering'.) This is new to me... A fan attached to the crankshaft??? What is this vehicle? I may be showing my age...I'm not sure if it's actually on the crankshaft...(I'm sure it's not...) That said, if you're going 70 mph and it (thermostatic clutch) causes the fan to come on, most likely you either have too little radiator or its plugged. JT Everything seems OK, but the previous owner sunk $1100 into the cooling system... doesn't mean they knew what they were doing. i knew a guy spend thousands on "cooling problems" for a rear engine, front radiator car he was trying to race. constant overheating. he, and a number of other "race mechanics" failed to see the significance of a 3/4" home-built water manifold bolted onto where the thermostat was supposed to be. whoda thunk to consider effect of such a small pipe on coolant flow!!! bottom line, these vehicles ship from factory having been tested at full throttle, fully loaded, in summer, in death valley. if yours is overheating just tooling along the highway without aftermarket assistance, there's something wrong. and it's not the fan. |
About thirty years ago while returning home from a car show with my 1956
Studebaker Hawk, the temperature gauge began to rise. I pulled over and
saw that the fan belt had "disappeared." At any rate, the rest of the
drive was on a freeway and I surmised that I could get home since the
incoming air would drive the water pump as well as cool the radiator so
long as I kept up a reasonable speed. The gauge never went above 180°.
Sometimes, "old" can be better...
JT
#12
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Hachiroku gYǧG wrote: '88 Supra...the Poster Child for Blown Head Gaskets... I know that version of Supra had head gasket issues. But surely the real poster child for blown head gaskets would be a Dodge Neon, wouldn't it? :-) |
#13
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On Tue, 01 May 2007 17:21:57 +0000, Grumpy AuContraire wrote: This is new to me... A fan attached to the crankshaft??? What is this vehicle? I may be showing my age...I'm not sure if it's actually on the crankshaft...(I'm sure it's not...) |
popular in the '80s. They worked pretty well when new, but the silicone
tended to leak out over the years. They would become progressively less
effective and the driver wouldn't know until the situation got really bad.
Mike
#14
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Grumpy AuContraire wrote: jim beam wrote: Hachiroku $B%O%A%m%/ wrote: On Tue, 01 May 2007 17:21:57 +0000, Grumpy AuContraire wrote: Hachiroku ハチ*ク wrote: On Mon, 30 Apr 2007 20:24:24 -0700, jim beam wrote: snip the fans don't work on the highway - airflow from car movement exceeds airflow from fan rotation by a country mile. if you were boiling, you had airflow restriction, thermostat problems or a gasket problem. LOL! You come to Mass on a hot July day, and I'll take you for a ride. At 70MPH on the highway, when the fan kicks in it sounds like a B-17 trying to pass you! Oh, yeah, the fan kicks in! (It's attached to the crankshaft...not electric, and uses a heat-sensitive oil that thickens when hot and causes the fan to be driven, rather than just 'feathering'.) This is new to me... A fan attached to the crankshaft??? What is this vehicle? I may be showing my age...I'm not sure if it's actually on the crankshaft...(I'm sure it's not...) That said, if you're going 70 mph and it (thermostatic clutch) causes the fan to come on, most likely you either have too little radiator or its plugged. JT Everything seems OK, but the previous owner sunk $1100 into the cooling system... doesn't mean they knew what they were doing. i knew a guy spend thousands on "cooling problems" for a rear engine, front radiator car he was trying to race. constant overheating. he, and a number of other "race mechanics" failed to see the significance of a 3/4" home-built water manifold bolted onto where the thermostat was supposed to be. whoda thunk to consider effect of such a small pipe on coolant flow!!! bottom line, these vehicles ship from factory having been tested at full throttle, fully loaded, in summer, in death valley. if yours is overheating just tooling along the highway without aftermarket assistance, there's something wrong. and it's not the fan. About thirty years ago while returning home from a car show with my 1956 Studebaker Hawk, the temperature gauge began to rise. I pulled over and saw that the fan belt had "disappeared." At any rate, the rest of the drive was on a freeway and I surmised that I could get home since the incoming air would drive the water pump as well as cool the radiator so long as I kept up a reasonable speed. The gauge never went above 180°. Sometimes, "old" can be better... JT that's not "old", it's simply designing the heat dumper to match the heat generator. with an electric radiator fan, no healthy car will use anything other than airflow cooling on the freeway. |
to turn the radiator fan when it's not needed;when the vehicle is at speed
and there's plenty of natural airflow.
The old belt driven fans changed to plastic blades because they could
flatten out at higher speeds and draw less power from the motor.
Electric fans were just the next step after that for economy.
--
Jim Yanik
jyanik
at
kua.net
#15
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Jim Yanik wrote: The old belt driven fans changed to plastic blades because they could flatten out at higher speeds by "flatten out" do you mean a variable pitch fan blade? that's somewhat exotic and rather expensive. what used them? |
brother was pretty fond of aftermarket "flex fans." If the plastic blade is
mounted to the hub by the leading edge, it's a good bet it is a flex fan. If
the blade is mounted by the whole root it is just another fan.
Mike
#16
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Hachiroku $B%O%A%m%/ wrote: On Wed, 02 May 2007 21:29:25 -0700, jim beam wrote: The old belt driven fans changed to plastic blades because they could flatten out at higher speeds by "flatten out" do you mean a variable pitch fan blade? that's somewhat exotic and rather expensive. what used them? My Supra has one. Also a Celica I had ('85) and an '85 Corolla. Most of the fans post 75 or so are plastic, one reason being weight and the other being the flexability of plastic. I can't remember the last time I saw a metal fan! just because it's plastic does not mean it's flexible enough to "flatten out" as if it's variable pitch. what mechanical properties do /you/ think "flexibility" gives the fan? http://www.flex-a-lite.com/auto/html/7-blade-flex.html |
#17
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Hachiroku $B%O%A%m%/ wrote: On Wed, 02 May 2007 22:34:13 -0700, jim beam wrote: Hachiroku $B%O%A%m%/ wrote: On Wed, 02 May 2007 21:29:25 -0700, jim beam wrote: The old belt driven fans changed to plastic blades because they could flatten out at higher speeds by "flatten out" do you mean a variable pitch fan blade? that's somewhat exotic and rather expensive. what used them? My Supra has one. Also a Celica I had ('85) and an '85 Corolla. Most of the fans post 75 or so are plastic, one reason being weight and the other being the flexability of plastic. I can't remember the last time I saw a metal fan! just because it's plastic does not mean it's flexible enough to "flatten out" as if it's variable pitch. what mechanical properties do /you/ think "flexibility" gives the fan? Who cares? you should if you want the fan to move the freakin' air that you think is cooling your engine!!! if the blades can adopt a position of least resistance, they will. that means throughput will be minimal - totally defeats their supposed purpose. |
I would be inclined to think that these fans could actually inhibit
cooling during high speed driving as the "flattened" fan blades would
act muck like a feathered prop in the wrong position which then enters a
windmilling mode.
I never had any confidence in these "devices."
JT
#18
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| I would be inclined to think that these fans could actually inhibit cooling during high speed driving as the "flattened" fan blades would act muck like a feathered prop in the wrong position which then enters a windmilling mode. I never had any confidence in these "devices." JT I don't think they can inhibit air flow that way because the air pressure |
should still be pushing air.
To each their own.
Mike
#19
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Michael Pardee wrote: http://www.flex-a-lite.com/auto/html/7-blade-flex.html did you know that the outer extremity of a fan blade moves faster than the bit nearest the hub? apparently these guys don't since it's the same pitch for the whole blade!!! what a total p.o.s. You're right about the change in air speed and that the ideal pitch should |
"screw." This isn't rocket science, though, it's just a radiator fan they
are trying to improve a bit. Regular fans work and these fans work. Take
your choice (I think you already did!)
Mike
#20
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"Grumpy AuContraire" <Grumpy (AT) ExtraGrumpyville (DOT) com> wrote in message news:tnn%h.110802$VU4.33178 (AT) bgtnsc05-news (DOT) ops.worldnet.att.net... I would be inclined to think that these fans could actually inhibit cooling during high speed driving as the "flattened" fan blades would act muck like a feathered prop in the wrong position which then enters a windmilling mode. I never had any confidence in these "devices." JT I don't think they can inhibit air flow that way because the air pressure against the blade is what flexes them "flatter." At least in theory, they should still be pushing air. To each their own. Mike |
Nope, the higher the RPM, the greater deflection of air, almost like
having a circle of plywood right in back of the radiator.... So much
so, it could become a negative factor at higher rpms. "Silence" has a
price...
JT
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