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#1 |
Registered User
![]() Join Date: Oct 2009
Location: Burbank,California
Posts: 285
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Overheating Help BB guys~!
Ok here we go 69 3/4 ton factory 396
Has correct fan shroud Has new radiator copper and brass 4 row rebuilt engine with barley 1000 miles Edelbrock performer manifold Rebuilt quadrajet by holley MSD electronic distributor Has a New old stock Carter rebuilt water pump Overheats mostly from hot weather and idiling like in a drive thru 1. The fan blade sits in the shroud. Should'nt it be 1/2 way in and 1/2 way out of shroud for maximum cooling? 2. I've tried running without a t-stat and now have a 180 just to try 3. How do I verify there is enough water flow. I can see it trickling thru the radiator slowly. And increases a little when i give it gas 3.5 Green antifreeze close to a 50/50 mix with distilled water 4. Should I do a compression test? I guess I will 5. Help!! 6. Could timing have a bearing?? I do have a torque type of cam. It's a mild one. What is your favorite way to time these motors. Please ! =) Mike Last edited by mikewarme; 08-11-2012 at 03:25 PM. |
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#2 |
Registered User
Join Date: Dec 2010
Location: livingston co.mi
Posts: 2,457
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Re: Overheating Help BB guys~!
how hot is it getting
check guage for proper reading check timing also
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#3 | |
Registered User
![]() Join Date: Oct 2009
Location: Burbank,California
Posts: 285
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Re: Overheating Help BB guys~!
Quote:
Timing with vacuum advance on is about 4degrees BTD. I have tried it in a few places all seems to overheat. Maybe she's running too lean?? Seems to run nice. I had a guy do a effiency tune for me. He leaned the metering rods and changed the springs and put the distributor on a degree machine. |
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#4 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Overheating Help BB guys~!
Lean and retarded timing makes heat. Bump your timing up to 12-14 degrees.
How new is the quadrajet. Some can be easily richened with the apt. Do you use a stock overflow tube on the rad with an open system or do you have a closed system. When it overheats what does it do? Start puking on the ground!! Do you have a coil in your bottom rad hose? Your distributor was recurved. Got specs! When it's idling can you feel air being drawn thru the rad? A piece of paper should be sucked to the fins at an idle. |
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#5 | |
Registered User
![]() Join Date: Oct 2009
Location: Burbank,California
Posts: 285
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Re: Overheating Help BB guys~!
Quote:
Nothing is connected to the overflow tube. I haven't let it get hot enough to puke! Just at the first line on the right of the guage No coil in the hose. The hoses get very ridgid when it's hot Yes Air sucks thru, I tried that. I still don't think there is much water moving.Im going to take upper hose off and see the volume that pumps through Mike |
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#6 |
Registered User
Join Date: May 2010
Location: Nixa, MO.
Posts: 81
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Re: Overheating Help BB guys~!
What about your fan clutch? A working fan clutch is a must for proper cooling, especially at idle. I would put a new one on unless it already is new.
It could also be your timing. I had a similiar issue after the 396 in my 70 Monte Carlo was rebuilt. It turns out that the cam was installed 4 degrees advanced and was causing my overheating issues. Had the cam installed correctly and no more problems. Wayne |
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#7 |
Newbee
Join Date: Jan 2010
Location: Phoenix, Arizona
Posts: 1,406
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Re: Overheating Help BB guys~!
Fan clutch bad?
I had to install a severe duty clutch on my .060 350 to get it to cool down. A standard duty would not do it. The new clutch moves a ton of air at idle. |
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#8 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Overheating Help BB guys~!
Yes 12-14 or even higher. Disconnect your vacuum to the distributor and plug it and set your timing. Then hook back up to the vacuum advance. Your idle speed will increase. Turn it back down.
How full are you filling the rad? If it hasn't puked it isn't overheating. No lower rad hose coil will let the hose collapse and the pump cavitates. No flow! Be carefull pulling hose off. No flow till thermostat opens. Then lots of hot water. Not a recommended procedure. Headers or stock exhaust manifolds? If either are glowing red hot that tells you it's lean and retarded. |
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#9 |
Registered User
Join Date: Oct 2010
Location: Largo Florida
Posts: 632
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Re: Overheating Help BB guys~!
Do you have any idea what the actual temp is? What makes you think it is overheating? Timing should be at least 10° BTDC with a stock cam and 12 to 14° with a mild aftermarket cam, these are minimum numbers. If it is bowing water out of the radiator, check the radiator cap, it should hold 15 PSI at least.
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Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." |
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#10 | |
Registered User
![]() Join Date: Oct 2009
Location: Burbank,California
Posts: 285
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Re: Overheating Help BB guys~!
Quote:
Thank you very much for helping me through this! By the way its almost 100 degrees outside Mike |
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#11 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Overheating Help BB guys~!
A is advanced which means btdc (before top dead centre). Think of advance this way. It's like shooting at a duck. You have to aim ahead of him to hit him when you shoot. That's called leading him or advanced. Your motor works the same way. You need to fire the spark before the piston gets to tdc. That's why it's called advanced or btdc.
On your timing tab advanced or btdc is to the left side of zero. Each line on the tab is 2 degrees. Would you have a pic of your carb? |
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#12 | |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: Overheating Help BB guys~!
Quote:
Keep a thermostat in place, at least a 180 or could go up to a 195. I'd install an overflow tank and use a pressure cap for a closed system (15# IIRC). This lets you fill the radiator with coolant.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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