Major Overheating with Sbc 355 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 01-14-2011, 11:34 AM
Chevz28's Avatar
Registered User
 
Join Date: Jan 2011
Location: Elbert Colorado
Age: 22
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Major Overheating with Sbc 355

i have a 84 chevy camaro z28, first thing is, i was driving it for a long time with a SBC 400 that was bored .40 over, street cam, edlebrock performer intake, edlebrock 600 carb, edlebrock water pump and never had a problem with overheating. Now, i rebuilt a 350, bored .30 over to be 355, with a 495 to 502 lift race cam, 202 camel hump fulie heads and with same intake, water pump, carb and with the same radiator, shroud, solid fan as before.
there is no heating, power steering or emissions - just alt, water pump and crank.

the 355 was free flow (w/o tstat) for racing ( 1/4 mi - 13.2s) and would heat up to 220 right after the race still running, shut off then would cool down.

then i put a 160 tstat in it so that i can drive again, let it warm up to drive, stays around 150 to 170 for about ten or so mins, then gets up to 180 and stays there for a few then gets to 200 after a couple mins and that is with out stopping and starting, i have never drove it farther than 200 to see wat it does.
when its cold outside it stays around 175 for a longer period but then starts to get hotter.

would like some tips to see wat i could do to fix this because here soon it will be the only thing for me to drive.
Thanks Mark
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-14-2011, 12:14 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,182
Wiki Edits: 0

Thanks: 2
Thanked 292 Times in 289 Posts
You do not need all this hocus pocus with the cooling system to go fast.
Put a 180deg thermostat in it and leave it alone.

If when you eliminate the OEM heater core circuit from the cooling system it will tend to be spikey especially while warming up.
If you don;t want to run a heater just create a loop with heater hose.
The best water path is from the outlet on the top of the water pump connected to the drivers side rear water port on the intake by the distributor. (not all manifolds have this provision) But if yours does , take advantage of it.

Motors with a big cam in it need a lot more base idle timing or they will run hotter than nessessary and want to overheat. The more cam duration and overlap, the more idle timing is needed , right up to locking out the advance curve.

What cam is in it. what is the base idle timing?

This assumes you do not have a head gasket leak or blocked water jacket, collapsing hose, faulty/blocked pump or blocked rad etc.
test the cooling system for combustion gasses.

further all third gen camaros and firebirds are "bottom breathers". if the chin spoiler is broken or missing below the rad support and the ducting baffles are missing around the rad, the air won;t go thru the rad and it will run hot.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-14-2011, 12:33 PM
Chevz28's Avatar
Registered User
 
Join Date: Jan 2011
Location: Elbert Colorado
Age: 22
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
so put the 180 tstat in it and see wat it does?

intake is aftermarket so does not have that inlet water port

im not sure on base idle and the specs for the cam i do not have with me at the moment

i have tested the cooling system and found nothing to be wrong

not sure on the chin spoiler, i took everything out that was behind front bumper that was in front the radiator when i first started driving it, nothing on the car or cooling system was changed when new motor went in.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-14-2011, 03:04 PM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,758
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
Quote:
Originally Posted by Chevz28
not sure on the chin spoiler, i took everything out that was behind front bumper that was in front the radiator when i first started driving it, nothing on the car or cooling system was changed when new motor went in.

Here's some pics of what you should have on your car.


Cole
Attached Thumbnails
Click image for larger version

Name:	716145.jpg
Views:	44
Size:	15.3 KB
ID:	51700   Click image for larger version

Name:	716145-A2.jpg
Views:	39
Size:	44.4 KB
ID:	51701  
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-14-2011, 03:08 PM
Chevz28's Avatar
Registered User
 
Join Date: Jan 2011
Location: Elbert Colorado
Age: 22
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
thats wat i do have on the car, i just took out everything behind that
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-14-2011, 04:01 PM
RippinRon's Avatar
Member
 
Last photo:
Join Date: Jun 2004
Location: Thornbury, Ontario
Age: 33
Posts: 948
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
The chin spoiler is a piece of plastic that hangs down behind the front fascia. It directs air up to the rad. Without it you get no cooling when you are moving. I know from experience.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-14-2011, 04:11 PM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,758
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
That's right Ron, My bad don't know what i was thinking i bought a new Z 2/8 in 82 , but the piece you have to have is a smaller black piece that's goes underneath the front piece i posted, And it will sit back just alittle it will not be right out front it is under the front a little bit. JMO
Look at the pic below and you can see it and know what i am talking about.



Cole
Attached Thumbnails
Click image for larger version

Name:	azcamsig.jpg
Views:	95
Size:	36.6 KB
ID:	51702  

Last edited by eloc431962; 01-14-2011 at 04:18 PM.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-14-2011, 04:40 PM
Chevz28's Avatar
Registered User
 
Join Date: Jan 2011
Location: Elbert Colorado
Age: 22
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
is that something that i could make?
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 01-15-2011, 08:26 AM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,182
Wiki Edits: 0

Thanks: 2
Thanked 292 Times in 289 Posts
Quote:
Originally Posted by Chevz28
is that something that i could make?
You can find all the pieces that you ripped out, at your local wrecking yard.
All those OEM plastic and rubber baffles and airflow directors are required to make the air go thru the rad. If you removed the A-C condenser you have to
fill the gaps between the rad and rad support.
You can get the correct OEM clutch fan,pulleys and shroud from any 1985+/- carbed 305 camaro or firebird.

Air only flows from high pressure to low pressure reguardless of anything else.
The chin spoiler below the rad support on these cars ensures the air does not slip under the car and creates the correct air pressure differential in front and behind the rad so air flows thru the rad.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 01-15-2011, 08:50 AM
Frisco's Avatar
Glad To Be Here
 
Last photo:
Join Date: Nov 2002
Location: Canton, North Carolina
Age: 72
Posts: 2,244
Wiki Edits: 0

Thanks: 0
Thanked 7 Times in 7 Posts
Quote:
Originally Posted by Chevz28
im not sure on base idle and the specs for the cam i do not have with me at the moment
Checking/setting the timing is the first thing I would do. Having the timing even slightly retarded will cause the engine to run hotter than 'normal'.

F-BIRD'88 has given you excellent advise as to the thermostat and re-installing the air dam as well as suggesting the timing.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 01-15-2011, 10:05 AM
RippinRon's Avatar
Member
 
Last photo:
Join Date: Jun 2004
Location: Thornbury, Ontario
Age: 33
Posts: 948
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Chevz28
is that something that i could make?
I found these on thirdgen.org.
Attached Thumbnails
Click image for larger version

Name:	S8001502.jpg
Views:	73
Size:	163.7 KB
ID:	51708   Click image for larger version

Name:	S8001503.jpg
Views:	111
Size:	158.3 KB
ID:	51709  
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 01-15-2011, 02:02 PM
malc's Avatar
Born To Be Mild
 
Last photo:
Join Date: Jun 2003
Location: Espaņa Right Coast
Age: 63
Posts: 3,193
Wiki Edits: 0

Thanks: 61
Thanked 52 Times in 50 Posts
Just a strip of aluminum.
Attached Thumbnails
Click image for larger version

Name:	IMG_0645A.jpg
Views:	75
Size:	72.1 KB
ID:	51713  
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 07-10-2013, 05:53 PM
Registered User
 
Join Date: Jan 2012
Posts: 20
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Fbird88 can i PM you to discuss the timing issue regarding over heating?
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 07-11-2013, 12:22 AM
68NovaSS's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Working with chromed bolts
Last journal entry: New to me T-Bucket
Last photo:
Join Date: Sep 2002
Location: Tri-Cities, Washington
Age: 67
Posts: 5,151
Wiki Edits: 9

Thanks: 86
Thanked 122 Times in 114 Posts
Quote:
Originally Posted by Joer5000 View Post
Fbird88 can i PM you to discuss the timing issue regarding over heating?
Why don't you start your own thread and discuss it on the board for all to see, you may be able to help someone with the same issues.
__________________
Boost adds dignity to what would otherwise be a vulgar brawl...

Midnight Sun Street Rod Association
Reply With Quote Quick reply to this message
The Following User Says Thank You to 68NovaSS For This Useful Post:
64nailhead (07-12-2013)

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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 for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
IFS help! major delima. silver86 Suspension - Brakes - Steering 20 01-16-2009 09:58 AM
i need of major help 32 duce Engine 3 11-25-2007 06:52 PM
Major C6 Issues BigBlockBabe Transmission - Rearend 3 02-29-2004 05:47 PM
Major Overheating Problem BigJeepAZ Engine 12 06-05-2003 06:51 AM


All times are GMT -6. The time now is 03:58 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.