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Old 07-11-2010, 11:57 AM
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cooling system help 77 monza

im have problems keeping my car cool.
backgroung on the car. its a 77 chevy monza 2+2, im building it for 1/8th mile drags, its got a fresh 30 over 350 with flat top pistons, comp cams 270h cam with matching valve springs, nothing special heads, mild port work and stock replacement valves, proformer rpm intake with summit 600 cfm carb, summit HEI ignition, timing is 10* inital, 40 total. sanderson 1 5/8s"shorty headers, 2 1/2" exhaust with summit race bullit mufflers turn downs under the front floor pans, 350 tranny, shift kit 2300 rpm converter, 4.11 rear gears in a spool.

the engine is broken in and running strong, but i cant keep it cool had problems cooling it last year as well, but i got a lot more money in it now and dont want to burn it up.

current cooling system in stock replacement vette water pump, 3 core monza radiator, core size is 16"x20" about a inch and a half thick, proform 16" pusher fan, 2100cfm air flow. it doent matter what thermostat i run in it, even without on, it still pushes past 210*, the hottest iv let it get was 230* at idle,shut it down at that point.

im looking at a summit aluminum 2 core radator, they say it the same as a 4 core copper brass rad.

the core support design on the car SUCKS, i have to stay close to the same size rad. or major mods will have to be done to the support. the summit rad. is 23X18" (core) so it will go in pretty easy.also, the alternator mount is on top of the engine, not to the side like most chevys, so the drive belt is not really contacting the water pump pulley, maybe 2" of the belt on the side of the pulley, could this be part of the problem?

if i go with the aluminum rad. and relocate the alternator to the side and keep the 2100cfm 16" fan on it will i be able to keep it below 200*?
would a electric water pump help?

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Old 07-11-2010, 02:13 PM
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Is this strictly an 1/8 mile car or street/strip? My opinion...pusher fans are a no-no, you're pushing air through the rad. while ambiant air is trying to blow back through it...fighting each other causes decreased air flow and high temps. Puller fan much better and some guy's like the stock fan.

That radiator looks pretty small, get the biggest you can fit. An elec fan is only a race item.....is the Vette w/p the right rortation? And I guess finally, 210 deg. isn't that hot but 230 is...for the street. Get rid of the pusher and see what happens......good luck.
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Old 07-11-2010, 04:20 PM
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the vette water pump is what it had from the factory.
there isnt enough room to run the fan as a puller, only have 2.5" between the radiator and pump pulley.

the temp problem is real bad when theres a lot of guys in my class there because we end up getting hot lapped for 2 or 3 passes to thin the class down some.

the cooling system in the car except for the fan was designed to cool a 140 HP 305. and the nose of the car has very little open area for air flow. i guess im gonna have to cut something up
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Old 07-11-2010, 06:03 PM
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I also suggest using a puller fan. I know jegs sells slim mount electric fans that can be either push or pull depending on how you wire them. Also, if the belt is slipping on the water pump you will have to get either an electric water pump or and electric drive kit for the existing pump. Also, make sure the rad is getting plenty of air flow through the front of the car.
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Old 07-11-2010, 07:09 PM
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Check out http://forums.h-body.org/index.php
That is a message board for Vega & Monza owners.
There is alot of good info there including ideas on solving cooling system issues.
It's a friendly group of people as well.

Jon
http://1972vega.wordpress.com/
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Old 07-11-2010, 08:53 PM
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air flow in the engine bay is a problem. iv also looked at the electric drive kit to run the pump. i think im gonna run one any way. help with cooling between rounds. im about out of money. i need to stay with my rc cars
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