408 getting hot
I only have maybe 200 miles on this motor, initially went with a 180 T-stat and got about 220 on these cool Tx days, well put in a 160 T-stat and now I am pissing everywhere on normal short drives, I have fans working properly and everything seems normal, T-stats are opening just keeps getting hot, I am going to do what James Yale suggested and put the front on ramps and then let it run since the deck height is higher and is almost even with the overflow tank. If not I might have to upgrade radiators and switch to a better single fan over my 2 small ones, anything I am missing, or is this just normal growing pains with a fresh tight motor?
|
over heating
This is not normal and there must be a problem somewhere in the cooling system. Make sure you do not have air trapped in the system. When you fill up the over flow tank you need to run till thermostat opens and then top of. We pull a vacuum on the cooling system to make sure that we get all of the air out. Make sure that your belt is not slipping and that your fans are pulling the air the right way. Good luck, Keith
|
Should I run the 180 or 160? also I am going to take advise from a BDR dealer and run it with the nose up to ensure all air is out of the system, other than that I might be forced to upgrade radiator and fans in the future. Thanks for the quick response
|
Back the timing off a couple of degrees. Check your fuel mixture. Have the collant tested for products of combustion.
|
As mentioned by Keithc8, air could still be in the cooant trane. Burp it out. New motor. What is becoming popular is the electric water pump. Once the calculated gpm is known, a water pump that provides the same flow at all times can help.
It is no fun to constantly be looking at a temp. gauge. 220 is a bummer. Good luck. |
I see 220 in stop and go on a warm/hot day. Otherwise it likes to run 200 at moderate speeds and 180 on the highway. With a 16 lb cap your coolant shouldn't boil until around 240.
|
It seems that a lot of folks have problems understanding the cooling system!!
The reason that a thermostat is installed is so that the engine can be kept at the best (most efficient for combustion) temp, without boiling over. 190 degrees to 200 degrees seems to be a nice temp to run at and is maintainable without to much hardware. The thermostats job is to keep the coolant in the engine block ,and heads, until it is at max operating temp.Then the thermostat opens lets enough hot coolant out and into the radiator where it can be cooled. At the same time from the bottom of the radiator (Cold side) cool coolant is allowed into the engine to....Cool it down. If the thermostat opens too soon, IE a lower temp, Then because the coolant is most always above that temp , the thermostat remains open all the time,so that the net effect is the same as having no thermostat. The coolant is flowwing as fast as the water pump is pumping. The coolant then does not stay in the radiator long enough to be cooled and returns to the engine still hot. So if you want your engine to run at 190-200 put a 190 thermostsat in and keep a low pressure radiator cap.I like to run no more than a 13 pound cap ,less pressure to blow out seals and gaskets and hoses etc!! John |
Never run any engine without a thermostat. The reason being the velocity of water through the engine is to fast thereby creating a larger than acceptable boundry layer next to the block. In simple terms there is not enough residence time for the water to take the heat away from the engine. Even a failed open thermostat acts as an orfice controlling fluid velocity through the engine.
|
Gasket mixed up?
Hi
if any of the solutions doesn't work, you might check if the head gaskets we're installed properly, i've seen the wrong gaskets in a brand new package,even if you're engine was professionnally build, it can happen...........so , as a last resort, it might be worth it to check on them........ good luck AL |
I'm going to go buy a 180 or 190 and then burp the system again in the afternoon, the above mention about consistant flow makes alot of sence and now i realize (I hope) I found the mistake that is making this thing run hot
|
make sure to drill about 1/8" hole in your t-stat to allow the air out.
Madmaxx, that is why they sell restrictors. In my mustang, i ran an fail safe that was no good. I never had cooling issues. |
Quote:
|
Yes, drilling the 1/8" hole allows any air trapped in your engine to escape
Quick explaination i found on the net Quote:
|
Make sure the hole is at the top.
|
fsstnotch
Thanks!! and excellent idea, how comical i was working on my father in-law sailboat Kubuta diesel last weekend and could not get the cooling system to bleed until about an hour of trying. As you indicate I could not get the thermostat to open and the temp kept rising, it did have a peacock on top of the thermostat but as you said above if the tstat does not open what good is it. I agree 1/8" hole is small enough to not affect flow but big enough to let gas out!!! |
I can't take credit for it! Someone on this site told me about doing this and it made total sense! I don't remember exactly who had said this, but it is a great idea!
|
Searce this Thread "Drilling The Thermostat". This thread solved my problem and sounds like a possible cure for yours
|
Patrick,
Did you get things all sorted out when you switched thermostats ? Any problems drilling your burp hole? |
All times are GMT -7. The time now is 12:09 AM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: