Jeff Lee wrote:
>
> Collins, Richard wrote:
> >
> > Lowering the Tstat temp will cause the fan to run more won't it? Won't
> > that rob you of precious HP more often unless you have an electric fan?
> > i.e. if it's not necessary for the engine to cool itself at 180, then
> > why pay the HP cost?
> >
>
> I think the above statement is backward. The viscous coupling in the fan
> clutch increases engagement with temp (well, normally - except for
> startup anomolies which defy reason). Therefore, if you lower the normal
> operating temp of the engine by installing the 180 tstat (stock is 195),
> the fan clutch will not need to engage as often and save a few hp.
>
> I would still like to hear Jules' reasoning behind NOT changing the
> tstat to 180. The only thing I can think of is a possible slight
> increase in HC emissions.
>
> jeff
> 98 rc v8 5spd 3.55sg flares fipk
Here is my 2 cents worth. I don't remember where I read this, but here
it goes:
When you change the thermostat to a lower temperature, you risk the
possibility of overheating. I know, it is hard to believe. The
explaination starts with temperature differental between ambient air and
water temperature. The higher the differential between ambient air
temperature and watter temperature, the more heat transfered from the
coolant to the air. By lowering your coolant temperature to 180, you
are lowering the temperature differential by 15 degrees. This means you
have to make up that 15 degrees in heat transfer somewhere else.
I'm no expert, this is from a magazine I read.
There is a good article on cooling systems in Mopar Muscle May 97.
If I find the article about the temperature differentials, I post the
information.
L8r
--
Thomas McCabe
-mccabet@mediaone.net
'85 D250, 340 on Propane, Auto
'89 Lebaron GTC, 2.2L Turbo II, A-555 5 Speed, MPSBEC
'91 Spirit R/T, 2.2L DOHC 16 Valve T3, A568 5 Speed, Anti-lock Brakes,
Power Windows, Locks, Drivers Seat.
'96 Dakota SLT Club Cab, Brilliant Blue, 5.2L, Auto, 3.55 SG,
Gibson Cat-Back Exhaust, ARE A-234 15x7 rims w/ Dunlop GT Qualifiers
255R60-15, Molded running boards and flares, Lund bug shield, Cool
Fronts, Ventvisors, and Extang Saber Tonnue cover.
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