Mo-Ideas about heated issues – part 1
Some random thoughts in no specific order related to high speed overheating of my Challenger since I got it back from the shop.
There’s two things I wish they didn’t mess with, one is change my old thermostat in the process of detailing my engine and the other was change my ignition timing when they were trying to get it to idle (what was needed was to adjust/richen the outboard idle mixture screws). Messing with only one system at a time helps troubleshooting. Oh well, make the best of it. Before I had no overheating problems and I didn’t back fire through the carb at all.
Through tweaking the carbs and timing, I’ve been able to drive the car harder with almost no popping out the carb, but accelerating under load can still cause a pop or multiple pops, oddly enough, about once per drive, if I jump on it.
The cooling problem only occurs if I get into high RPM’s for a couple of sustained runs (usually hard acceleration) – then I watch the temp gauge drift higher out of the normal range which does not cool off until i park the car. The car runs well (doesn’t start high temp knocking), but I take the Challenger back home not tempting fate with it boiling over on the road.
BULGE HOODS NON-FUNCTIONAL or FUNCTIONAL?
Getting more air flow – Every little bit helps.
Just incase you were wondering, the bulge hoods as they come of the showroom floor are non-functional. However, with a phillips screwdriver, you can remove the outer sheet metal covers and allow air to stream into the dual scoops.
Behind the scoops under the hood are plastic diverters that allow air to slip over and into the engine compartment, but will catch water and route it off laterally to drip rails on the inside of the bulge.
For a cooler look, you can get some black touch up paint and help blackout the screw tabs if they are the same color as your body to make them less conspicuous.
In this close up of the R/T hood scoop, you can see how the Factory set them as “non-functional” bulge hood.
With the flip of your Phillips Screwdriver, you can remove the metal plates that block the opening that keep the low flying birds from getting sucked in and have a functioning ram air bulge hood.
Here is the under hood look at what is behind the hood scoop. You see a water deflector which allows air to pass over and directs water (and air) laterally to a hood rail.
If I were to cut a perfectly good piece of sheet metal (which I will not), the back of the bulge would be a nice customization spot to vent a hot engine compartment.
BULGE HOODS (continued)…
The reason I started looking at simple ways to get the under hood temps cooler is ever since I got my car back from the shop it’s been running hot after high speed runs (at least above 4000-4500 RPM). The guys at the shop replaced the thermostat in the process of detailing the engine. At low and moderate speeds the engine runs at a reasonable temp (according to my dash temp gauge) where coolant does not overflow when I stop the engine.
MILODON HI FLOW THERMOSTAT ON ORDER
We used a 180 deg thermostat, which is okay, but I’ve ordered Milodon Hi Flow unit along with FLUKE 62 MAX laser thermometer to see what the actual temps are on the engine and radiator (and on our kitchen frying pan!). I plan to replace the thermometer as well as check for any surprise objects that might be under or interfering the thermostat operation.
WHAT ABOUT REDLINE WATER WETTER?
I also plan on draining all the coolant and run 100% distilled water plus RedLine Water Wetter, which you must run if you run only water in order to lubricate the water pump and also help bring the coolant temps down more.
I ran this coolant setup on my 1965 Mustang that I used for open track. The other cool benefit from running only water for coolant is if you spew water, it doesn’t become a green toxic track mess. Open track coolant spills are a pain requiring special cleanup procedures, but if you’re just running a water and Water Wetter… no problem, it just needs to evaporate! It’s important that you change the coolant every year, because I’ve heard that old Water Wetter can begin gumming up your cooling system.
Changing coolant becomes less of an issue since draining water (with a little Water Wetter) is more ecologically safe compared to GREEN coolant. (At least I think so!).
THOUGHTS ON CARB JETTING
If the above ideas don’t help cool down the engine enough, I’ll need to check the plugs and see if the engine is running too lean. I retarded the timing from 36 to 34 degrees Total advance and I still have a problem. Running richer jets, will have some effect on engine temp also. I believe the stock jets on the primary carb are #62’s and I have a spare set of #64s and #66s.
Actually, I’ve run variations of jet sizes in my Mustang and have run timing off, and I don’t remember having to worry about overheating, but every little idea helps (and will make the engine run stronger).
For right now, it’s easier to check the thermostat, change the coolant and look for obstructions.
Here’s a close up of my steel fan and clutch and fan shroud connected to a 4 core steel radiator.
My O’Reilly Auto Parts Special. Before I put this in, my engine would spew coolant, now even with the engine getting excessively hot after high speed driving, the large can size is just large enough to catch the whole burp. Good thing I decided to by the larger overflow “can”
RANDOM ODDs and ENDs
My car has a 3 core-copper radiator, offset-bladed fan with a clutch and fan shroud. No, I’d rather just keep the factory stuff and not have to run an aluminum radiator if I don’t have to (although as fellow Linkedin member Erik Kenny notes, these symptoms are hot for a clogged radiator).
I had added the coolant overflow kit (the largest size available at your typical auto supply store) before this cooling problem and it’s a good thing, otherwise I’d have a driveway full of coolant every time I stop after a high speed highway drive. Right now it’s a self contained system that keeps all the overflow and sucks it back in when it cools down.
LASER CHECK YOUR BUTTERED EGGS, BEER and YOUR B-BLOCK MOPAR
I’ll give you guys an update after I check the thermostat and laser check the cooling system and my fried eggs in butter. By the way, you shouldn’t heat butter over 350-400 degrees when cooking. The next time you come over for a beer you can borrow my laser thermometer to make sure you’re not over-nuc’ing your eggs or your MoPar.
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The Dodge Kid in his youth about 1976.
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