Rad. sq. in. question

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Rad. sq. in. question

Postby h-bot » Sat Mar 16, 2002 12:25 pm

From: cliffhangeriii_REMOVE_896083_THIS_@yahoo.com


I should have just phrased it all large heavy
cars have large rads. Bottom line is our cars were
never ment to have anything larger than a small cube
smog motor. When I was running a stock 307, no matter
what the conditions she never went over 200. 350 and
larger and high HP in our cars are like puting a bowling
bag over your head and running around outside on a
warm day...

Cliff

P.S. Dont forget to
tell your wife your heads in there before she gos
bowling...its happened to me before...OUCH!!!


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Rad. sq. in. question

Postby h-bot » Sun Mar 17, 2002 8:47 am

From: twelve_second_vega_REMOVE_547771_THIS_@yahoo.com


Cubic inches & horsepower production place the
greatest demand on a cooling system. Engines that are
required to operate under heavy loads & high rpm,like the
truck you mentioned, place additional demand on the
cooling system even though they produce little HP & TQ in
comparison.

A/C produces additional load and heats the air used
for cooling the radiator.

You observation is
correct, but high HP and TQ production requires additional
fluid capacity and surface area to a greater extent
than smaller engines producing less HP and TQ.


Again, in reference to the truck you mentioned, low
compression engines and the retarded spark timing common to
cars/trucks of the mid 70's and 80's produce incredible
amounts of heat.

195 thermostats (a type of smog
device) also raised engine operating temperatures to
incredible levels.

I like to use maximum surface
area in Vega's, but this isn't always easy to do. The
next best route is to increase fluid capacity and fin
count.

My 302 ran in the 220 degree range @ idle with a
16" X 21" X 2" 3 row having 12 fins per inch and 72
3/8" tubes running a 3/4" restrictor.

With my
13"X 21" X 2.5" 4 row having 16 fins per inch and 120
tubes total, the temperature will not go over 180 at
idle on a 100 degree day.

On the other hand,
most stock V8 Monzas I have seen without A/C have a
16" X 21" X 1.250" 2 row with 12 fins per inch and 40
5/8" tubes.

I have replaced one of these
radiators with a 4 row, at the customer's request, and the
engine ran not a single degree cooler. HP & TQ
production were low enough that the 2 row was all the engine
needed.

I always evaluate an engine's ability to cool (or
not) on a case by case basis. However, the phrase
'Bigger is Better' quite often applies here.

The
Vega is quite a challenge to cool...Robert


[This is message #34488 by user twelve_second_vega on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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Rad. sq. in. question

Postby h-bot » Sun Mar 17, 2002 9:34 am

From: Monzabudd_REMOVE_587487_THIS_@yahoo.com


I noticed this yesterday...
My red monza was
sitting outside Idling.
I had put some soap and water
on the hood,washing it a bit, and I noticed that
there was quite a bit of air escaping between the nose
and hood (closed).
enough spit droplets of water
out.
The engine was in semi fast idle though, about
1,250 rpm.
thats quie a bit of travel for air to
escape with that much of a woosh.


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Rad. sq. in. question

Postby h-bot » Sun Mar 17, 2002 1:48 pm

From: cliffhangeriii_REMOVE_131685_THIS_@yahoo.com


Thanx for the reply Robert. Its nice to have a
debate that doesn't get rediculous...


Cliff

P.S. Some People forget to tell their wives their
heads in the bowling bag...


[This is message #34511 by user cliffhangeriii on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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Rad. sq. in. question

Postby h-bot » Mon Mar 18, 2002 1:16 am

From: twelve_second_vega_REMOVE_430442_THIS_@yahoo.com


No problem. This is how the club is supposed to work...Robert


[This is message #34553 by user twelve_second_vega on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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