Need help....Overheating for a few years now - Team Camaro Tech
Heating & Cooling Heating, cooling and air conditioning

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 19 (permalink) Old Mar 9th, 07, 09:47 AM Thread Starter
 
Join Date: Mar 2007
Posts: 8
Need help....Overheating for a few years now

Hey all this is my first time posting on this forum but that could be due to me not owning a Camaro. I have a problem with a 350 Chevy motor overheating, reading other posts you guys have a lot of interesting suggestions that might help my situation.

Here is the scoop in 2001 I had a 350 Chevy put in my 1991 Mazda B2200 pickup you ask why well itís a show truck and I needed it to look pretty. The motor is bolted to a turbo 400 trany and cooled by a 4 core Griffin aluminium rad with dual Flex-a-lite fans. Also I swapped out the rear end for a Ford 9 inch to get the right gear ratio.

When the motor was built it ran around 180-190 degrees but it was set very rich for break in time. The next few years I didnít drive it much because it always would run around 220 degrees and I got tired of keeping the heat on in the summer, did I mention I only drove it in the summer. Now I can only drive it at night on those cool summer nights or with the heat on even that gets the temp up to 220-225 degrees.

I have changed the thermostat several times trying different ones to see if this would help and I ended up just running an open thermostat because nothing else worked. In 2002 I had the shortie Hedman headers wrapped but then was told about horror fire stories so I took it off. In 2005 I got the headers ceramic coated but didnít notice a drop in temperature.

This is what I know the trany should have been a 700 to give me the overdrive also because of the custom truck the front bumper cover is not letting that much air through the front. Before I go and change the trany and front end of my truck I want to know if there is anything else I can do to try to keep this motor cool.

I appreciate the comments.
Mazrolet is offline  
Sponsored Links
Advertisement
 
post #2 of 19 (permalink) Old Mar 9th, 07, 10:41 AM
DjD
Retired
Dennis
 
DjD's Avatar
 
Join Date: Apr 1999
Location: Fortuna, CA
Posts: 26,548
Garage
Re: Need help....Overheating for a few years now

Hi Maz...

I think you need to go back to the basic's, install a 180 stat and be done with playing with it. If it opens and the temp gets above 180 it isn't going to close so unless it isn't opening it's not part of the equation. Next we really needs more info from you. It sounds like an air flow through the core problem but until you can tell us when the engine gets hot on you don't take that for gosipel...

Usually knowing that temps climb when idling but drop off when moving indicates your fan(s) are not pulling enough air through the core. From there if it doesn't cool down at 60 mph the core may well be blocked and not getting enough flow through it. Most vehicles with restricted grills use some form of baffeling to maximize air flow to the core. You may need to fab up something along this idea.

...Dennis

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


"Don't take life so serious, you won't get out alive..."
DjD is offline  
post #3 of 19 (permalink) Old Mar 9th, 07, 10:51 AM Thread Starter
 
Join Date: Mar 2007
Posts: 8
Re: Need help....Overheating for a few years now

Thanks DjD the trucks in storage but I'm heading that way so I will start her up and see what the Temp is like at idle. I will put the 180 in.

It get's hot usually when driving but let me see what the temp is at idle.
Mazrolet is offline  
 
post #4 of 19 (permalink) Old Mar 9th, 07, 11:32 AM
Senior Tech
Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 13,321
Re: Need help....Overheating for a few years now

As DJD says
We had a very nice cinversion of a 300z with a 350/350 turbo in the workshop a while back....and that ran hot.
After sorting a few tuning problems like curve/carb...was still hot, thu ran a little cooler on the open road at higher speeds.
The trans cooler was mounted in front of the raditor...this was relocated to the side behind the grill (well if it had a grill as we know it)
This helped.
The licence plate was mounted over the front lower grill. Moving this helped a little more, as did using a second electric fan so that now most of the grill was also fan cooled
We knew the raditor was big enough and had reasonable air flow...
The raditor was flushed and flow checked at the start...
So pulled the header tanks off, manually cleaned the cores...
Problem solved...would hit 195* in heavy trafiic

This 300z was impressive, even thu the engine was basically stock...
That engine compartment was made for a SBC and trans. The interior gear stick consol etc ...everything was stock nothing had to be changed.

My Spelling is not incorrect...it is creative

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Steptoe is offline  
post #5 of 19 (permalink) Old Mar 9th, 07, 11:36 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 32,178
Garage
Re: Need help....Overheating for a few years now

Using a high-flow thermostat would probably help, MRG-4364, Mr. Gasket p/n.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.
Everett#2390 is online now  
post #6 of 19 (permalink) Old Mar 9th, 07, 01:49 PM
Gold Lifetime Member
Fred
 
Join Date: Nov 2006
Location: Seabeck WA
Posts: 8,375
Re: Need help....Overheating for a few years now

Are you relying on the stock fan configuration? I'm sure the flexalite is a clone of the factory system. That means you need a shroud. They're vital. No more than 1" clearance from the blade tips and make sure the blades are just inside the shroud for good suction. God I love that word! Good luck. How about some pictures?

One owner 69 Camaro,(yep, bought it new
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe. 3700 lbs. with me in it.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Fred Ficarra is offline  
post #7 of 19 (permalink) Old Mar 9th, 07, 02:06 PM Thread Starter
 
Join Date: Mar 2007
Posts: 8
Re: Need help....Overheating for a few years now

Ok after runing the truck for 30 min the temp only reached 150 this of course is in cold weather at 0C. I didn't change the stat yet so it's still open.

Steptoe my trany cooler is mounted behind the rad so I guess that's a good thing. The Edelbrock Carb does need a little tuning which I'm sure will help a bit.

As for the fan shroud that's a good one the engine bay is so small the fans are mounted to the rad (without shroud). The crank pully is so close to the rad you can barely fit your fingers between the rad and pully. There is just no way to have a shroud in my setup.

Do you think getting rid of the dual fans and going with one 12" fan might be better?

I will try to post some pics.
Mazrolet is offline  
post #8 of 19 (permalink) Old Mar 9th, 07, 02:40 PM
Senior Tech
Steve
 
Join Date: Jun 2005
Location: Melbourne, Australia
Posts: 2,864
Re: Need help....Overheating for a few years now

You are obviously not exchanging enough heat, which could be not enough airflow, radiaitor capacity, or not enough water flow.
It sounds like your radiator and the air flowing through it should be OK but..

What is the condition of your waterpump? Perhaps the impeller is shot.
Do you have the correct sized pulleys so it's spinning fast enough?
Is there the possibility of a head gasket failure? -Are exhaust gas bubbles forming at the radiator cap?
Are you losing water/pressure from a bad cap?
If you have a recovery tank, do you have the correct recovery cap?

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BlackoutSteve is offline  
post #9 of 19 (permalink) Old Mar 9th, 07, 02:41 PM Thread Starter
 
Join Date: Mar 2007
Posts: 8
Re: Need help....Overheating for a few years now


[IMG]
http://images22.fotki.com/v724/photos/1/1111930/4699900/Photo0009-vi.jpg[/IMG]
Mazrolet is offline  
post #10 of 19 (permalink) Old Mar 9th, 07, 02:44 PM Thread Starter
 
Join Date: Mar 2007
Posts: 8
Re: Need help....Overheating for a few years now

Mazrolet is offline  
post #11 of 19 (permalink) Old Mar 9th, 07, 06:58 PM
DjD
Retired
Dennis
 
DjD's Avatar
 
Join Date: Apr 1999
Location: Fortuna, CA
Posts: 26,548
Garage
Re: Need help....Overheating for a few years now

From what I'm seeing you have a very small grill area, twin electric pusher fans and a portion of your core blocked by a trans cooler. Your problem is air flow!! Make sure your fans are moving the air the right direction. If they are, I'm thinking your in for a spending spree...

You have a very thick core and having the fans mounted on the outside of the engine compartment and pushing air through the core isn't the way to go. The pusher fans actually block flow when the car is moving as they physically block the core. The trans cooler doesn't help either, mounted low and on the outside of the rad core would be a better location for it.

You are between a rock and a hard spot here... What I would do is find another rad that's not as thick as that 4 core. Air flow through a thinner core will increase greatly. No room for puller fans so get the most cfm single electric fan you can find, make sure it turns the right way to push air through the core. Then replace your trans cooler with something you can mount below the rad core, there are some cool units that are about 2" round and different lengths that won't block your core. You could even get an core with a trans cooler in the tank.

With those changes if you are still not running where you want work on some ducting from under teh bumper up into the core and try blocking off the air gap from the radiator back on th eunder side of the car.

...Dennis

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


"Don't take life so serious, you won't get out alive..."
DjD is offline  
post #12 of 19 (permalink) Old Mar 9th, 07, 10:23 PM
 
Join Date: Jan 2007
Posts: 50
Re: Need help....Overheating for a few years now

I am not sure, but I think it is not too hard to pull that grill out "just temporarily" and drive for a while, mabey even the plastic bumper guard. If it runs cool, then you know you need to open it up somehow. A lot of things can cause overheating, but I can see that not much air can get through that grill.
1511tim is offline  
post #13 of 19 (permalink) Old Mar 9th, 07, 10:25 PM
 
Join Date: Jan 2007
Posts: 50
Re: Need help....Overheating for a few years now

Dont forget that the incoming air also needs to get out in order for there to be good flow.
1511tim is offline  
post #14 of 19 (permalink) Old Mar 10th, 07, 07:54 AM
 
Join Date: Jan 2007
Posts: 1,163
Re: Need help....Overheating for a few years now

you could try a cowl hood...air will pass much more readily ...as 1511tim suggested,if it can get out , your temp might drop...i think the restrictor is a bad idea especially in your case, as water doesnt have enough time in the radiator to cool off...you could also try water wetter...you can get it at summit or jegs...i believe it improves the conductivity of the water so it sheds heat better...
kustomwerker is offline  
post #15 of 19 (permalink) Old Mar 10th, 07, 01:37 PM
Senior Tech
Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 13,321
Re: Need help....Overheating for a few years now

Quote:
Steptoe my trany cooler is mounted behind the rad so I guess that's a good thing.
As DJD says above behind/infront, it still restricts...
I have mine mounted below the raditor and attached to, leaning back to the bottom of the engine.
The fans need shroud to work...look at the fans inside your computer....without shrouds most of the air spills off the end of the blades rather than being directed in the direction needed.
DJD mentions this before moving onto restrictions due to the size of the radiator..I agree...
Even if you use a less restricting radiator with your current setup the chances are you will still have the same problem....sorting the fans 1st has a very good chance of sorting without going to a new raditor.
Your grill size...that may or may not enable enough flow...looks close either way...so sort the fans.
can you duct up from the bottom vents also?

Quote:
Ok after runing the truck for 30 min the temp only reached 150 this of course is in cold weather at 0C. I didn't change the stat yet so it's still open.
Slip a sheet of newspaper over the grill or front of the raditor, get the temp up then see if it drops....
Quote:
Is there the possibility of a head gasket failure? -Are exhaust gas bubbles forming at the radiator cap?
Check out the local workshop, get them to run a HC gas test on the raditor...
Further info in other posts....If this is positive, no matter what you do, a leaking head gasket will still run it hot.
A 3/16 hole drilled in the thermostat will give u a high flow thermostat (a Smokey trick)..do not run without a thermostat, u can get into a situation where the water flows thru the raditor to fast to cool...again an issue Smokey addressed yrs ago and an issue I have had to address.
Replacing the thermostat and cap is also worth a try...very common issue.
Have you checked the sender is reading right?
A thermometer in the top of the radiator with give a
Quote:
close
reading to the gauge +/- 5* or put in a electic jug with a thermometer and heat up the jug.
These are all low cost/labour issues before getting into bigger fixes.

My Spelling is not incorrect...it is creative

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Steptoe is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Bummer...STILL Overheating.....HELP ! markr Heating & Cooling 37 Oct 24th, 06 11:07 AM
2001 V6 overheating scoobydoo Fourth Generation 1 Oct 19th, 06 05:03 PM
Mickey Thompson murder case: 18+ years ago! b-boy Off Topic 20 Aug 16th, 06 09:41 AM
Interchangable Years 67_camaro Camaro Tech 4 Jun 16th, 05 07:58 PM
Whats Up for New Years? zuma Bench Racing 9 Dec 22nd, 04 05:39 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome