some answers please - Team Camaro Tech
Heating & Cooling Heating, cooling and air conditioning

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post #1 of 17 (permalink) Old May 27th, 17, 11:33 AM Thread Starter
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gene
 
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some answers please

Ok here is the problem, I just had a new 383 built and dynoed at 600 hp (598) pump gas motor AFR alum heads and a hyd roller cam. It has an AFCO 2 row aluminum radiator,victor aluminum water pump(35mpm) 160 thermostat, 3300 cfm electric fan w/shroud. It goes up to 180 when I first start driving then drops down to 160 then up to 180 then down to 175 then 190 then 200, 205, 210. i dont understand how some cars that have 1200 hp run cool. can someone give me some insight on how to cool this b***h down cause id really like to drive it when temps go above 70
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post #2 of 17 (permalink) Old May 27th, 17, 11:59 AM
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Re: some answers please

Quote:
Originally Posted by 1neat69 View Post
Ok here is the problem, I just had a new 383 built and dynoed at 600 hp (598) pump gas motor AFR alum heads and a hyd roller cam. It has an AFCO 2 row aluminum radiator,victor aluminum water pump(35mpm) 160 thermostat, 3300 cfm electric fan w/shroud. It goes up to 180 when I first start driving then drops down to 160 then up to 180 then down to 175 then 190 then 200, 205, 210. i dont understand how some cars that have 1200 hp run cool. can someone give me some insight on how to cool this b***h down cause id really like to drive it when temps go above 70
Your radiator does not have enough surface area to cool the heat generated by your engine. I've attached a link to the 57 Chevy Jeff Lutz drove on drag week a few years back. Look at the size of the radiator, that what it takes to cool 1200 hp on the street.

PRI 2013: Jeff Lutz's Lightweight "Evil Twin" Drag Week 1957 Chevy - Dragzine

Thanks,

Jeff


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post #3 of 17 (permalink) Old May 27th, 17, 01:28 PM
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Re: some answers please

First thing; Did you remove ALL air from the cooling system? I have a Lisle funnel. Another thought could be your fans possibly turning the wrong direction? Maybe they are pushing instead of pulling. Wonder if they are turning on at the correct temp, but maybe cutting off too soon. That would create a gradual warm up. Another issue that I ran into with my 72 Chevelle with 454 & 6-71 blower was my exhaust primaries were too small, not allowing the exhaust to leave the engine efficiently. My primaries were running at 500 degrees! I put hedders on with 2" primaries and it totally fixed the issue.

Brett......

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post #4 of 17 (permalink) Old May 27th, 17, 03:58 PM Thread Starter
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Re: some answers please

Fans turning correct direction plus it is constantly on and the primaries are 1 7/8 with 3 inch exhaust
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post #5 of 17 (permalink) Old May 27th, 17, 04:01 PM Thread Starter
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Re: some answers please

Plus I cant get a radiator like the evil twin, that thing is the size of Utah
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post #6 of 17 (permalink) Old May 27th, 17, 04:47 PM
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Re: some answers please

hate to tell you, but lose the electric fans and solve your problem
I had the same problem with my 383 and went to a belt driven fan and now mine runs 165-175 all day long
I do have a 3 row champion
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post #7 of 17 (permalink) Old May 27th, 17, 07:40 PM
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Re: some answers please

When does the temp go up above 190.... cruising above 40mph, or in slower stop-n-go traffic?

If it is above 40mph, some possibilities could be your air/fuel mixture could be too lean, incorrect timing, air pocket in coolant, bad thermostat, or the obvious... your radiator is still to small (or clogged).

If you are running hotter at slower speeds (and stop-n-go traffic) and ok at cruise, then I agree with Kevin's post... go to a belt driven fan.

I run a Dart SHP 400 small block, AFR heads (est 500+HP), and I have a 31" wide Summit Universal 2 tube radiator with a belt driven 7 blade clutch fan w/shroud... and I never get above 180 (even when the outside temp is above 90 degrees - cruise and stop-n-go). I run a 180 degree thermostat.

I was told a single electric fan is not going to pull the same amount of air thru the radiator as a good old fashion belt driven fan. I also positioned my fan so the blades are 1/2 way within the shroud and 1/2 exposed. I don't know whether it's true or not... but I was told the fan will pull more air thru the radiator this way. I also put some HVAC weather stripping between the fan shroud and the radiator for a tight seal.

Below are a couple photos of my set-up.
https://app.box.com/s/34vm7tr0xhebfu9oypynnpcetw8ct15s
https://app.box.com/s/d2aqair82udqvmwhl3q7iz1l4t5m0hg7

Hope this helps.
Mike

Last edited by oldschoolchevy; May 27th, 17 at 07:59 PM.
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post #8 of 17 (permalink) Old May 27th, 17, 08:14 PM
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Re: some answers please

I know a few people who went with a 160 thermostat and had overheating problems. I've used a 180 for decades and never had a problem.

The engine needs to get to a certain temp to burn off moisture in the oil, running under 180 seems very unhealthy for the oil and the engine.

If I were you I'd swap the 160 for a 180 first. If that doesn't help try a belt driven fan with a properly set up shroud and that should do it. If still no, might have to step up to a larger rad.

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post #9 of 17 (permalink) Old May 27th, 17, 10:29 PM
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Re: some answers please

I started at 493hp at the wheel, now 500Hp+ at the wheel with my small block,180 T-stat Griffen radiator with dual electric fans with different on off temps 185/195. I don't have weird fluctuations and don't think I've ever seen over 210* yet accept for during dyno runs it got a little warmer. Also run an edelbrock alum water pump.

Put a 180 or 190* t-stat in so the car warms up. Then check your fan on off temps and water temp senor location/accuracy. The rear passenger side head runs the warmest on a sbc. My auto meter console gauge is on the drivers head,my fan control ECU sensor is in the passenger head.

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post #10 of 17 (permalink) Old May 28th, 17, 05:22 AM
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Re: some answers please

Could be tuned too lean also.
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post #11 of 17 (permalink) Old May 28th, 17, 06:29 AM
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Re: some answers please

What fan/s are you running ?
Does it/they have a shroud/s ?

Look into a Mark VIII fan, electric, has a shroud, and moves a ton of air

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post #12 of 17 (permalink) Old Jun 1st, 17, 04:36 PM Thread Starter
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Re: some answers please

what year mark VIII? what is the CFM
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post #13 of 17 (permalink) Old Jun 1st, 17, 04:59 PM
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Re: some answers please

I run a 600 hp (engine dyno) 383 in my '33 Ford and it will stay at 180 all day, idling or driving. I run 36 degrees total timing, 20 degrees initial and have a Walker copper and brass radiator, with no shroud........but I had to take out my Spal electric fan, which was a puller not a pusher, and now run a 5 blade GM 16" fan.
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post #14 of 17 (permalink) Old Jun 2nd, 17, 04:02 AM
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Re: some answers please

Quote:
Originally Posted by Chevy68 View Post
Your radiator does not have enough surface area to cool the heat generated by your engine. I've attached a link to the 57 Chevy Jeff Lutz drove on drag week a few years back. Look at the size of the radiator, that what it takes to cool 1200 hp on the street.

PRI 2013: Jeff Lutz's Lightweight "Evil Twin" Drag Week 1957 Chevy - Dragzine
Actually that is a misconception to an extent. There are different core types that cool better than the next. For my 572 pushing a potential 820-890hp with the meth injection I was running into clearance issues. C&R Racing helped me out by building me a one off custom shroud with a prototype Spal fan. They also assured me that if for some reason there wasn't enough clearance to the serpentine system that they would build me a NASCAR type rad that is only 1" thick that has superior cooling traits and a healthy price tag to match of $2400.

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post #15 of 17 (permalink) Old Jul 1st, 17, 04:49 AM Thread Starter
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Re: some answers please

So i ordered a Lincoln mark viii fan i found on ebay ($70 ) it was cheap enough and fit perfect from tank to tank and top to bottom and looks good too. I ordered the Ron Francis relay kit, wired it up and took it for a ride and it was FREAKING perfect. never went above 170. So in case you need to cool a high HP motor and dont want to spend big $$$$ get one it works. Thanks Doug G for the info on the fan
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