[C2] What exactly happens during engine overheat?
#21
Drifting
I think your starting issue was related to fuel temperature, not engine temperature. 220 is not hot, it's just slightly over normal operating temperature for modern engines.
But when the coolant is at 220, the carb is pretty warm also, and fuel will boil, and do fun things.
I tend to leave the hood open on my 62 if I'm stopping for a little while, so it can cool off a bit. And the fresh air duct blowing on the carb trick also helps especially in summer (not so helpful in winter when you kinda need the heater working)
I'm glad I live where they don't bother inspecting our cars any more.
But when the coolant is at 220, the carb is pretty warm also, and fuel will boil, and do fun things.
I tend to leave the hood open on my 62 if I'm stopping for a little while, so it can cool off a bit. And the fresh air duct blowing on the carb trick also helps especially in summer (not so helpful in winter when you kinda need the heater working)
I'm glad I live where they don't bother inspecting our cars any more.
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rad-man (02-13-2024)
#22
Instructor
Thread Starter
Now I’m just going for a clean driver look. Don’t think I’ll ever get to the NCRS level of everything being exactly correct.
it’s a 5 blade fan, and not sure if it’s stock or not.
regarding belt alignment, the alternator was mounted all sorts of ***-backwards with weird washers when I got her. This is how I have it lined up now (everything looks straight).
No headers. Stock 2.5” cast iron manifolds.
Last edited by rad-man; 02-13-2024 at 09:27 PM.
#23
Instructor
I have a '65 327 300hp that was previously modified to a 350-365hp.
- I recently replaced the radiator (DeWitts), water pump (EMP/Stewart stage 1), 180* thermostat, all new hoses, etc.
- I also have timing dialed in using Duke/Lars method and I'm pretty sure she's running in tip top shape - very responsive, very smooth.
The only thing I haven't changed is my fan clutch, which I'm about to pull the trigger on.
Over the past few months, I've been venturing out farther and farther from home, and was under the impression that everything was "fine"...... until I went in for a state inspection.
They drove her around back for the inspection, and I waited up front. I know they left her on/idling the whole time as I could hear from where I was sitting.
The brought her back to the front, shut off the engine, and I was about to leave when she wouldn't start. I looked at the temp gauge, and she was ~220 - way hotter than I had ever seen it.
- the radiator cap never released, and I didnt have an infrared gun to check temp. I waited about an hour for her to cool down, occasionally cranking the starter to let the water pump do it's thing and move the water around. Temp gradually dropped to 160, and I got it started and rushed home.
- I checked the accelerator pump during the hour, and I never lost gas. However, I never checked for spark.
My questions:
What happens when the block gets hot that would prevent a restart? Do piston tolerances change with the heat to mess with compression?
or something much more simple like the coil overheating?
- I recently replaced the radiator (DeWitts), water pump (EMP/Stewart stage 1), 180* thermostat, all new hoses, etc.
- I also have timing dialed in using Duke/Lars method and I'm pretty sure she's running in tip top shape - very responsive, very smooth.
The only thing I haven't changed is my fan clutch, which I'm about to pull the trigger on.
Over the past few months, I've been venturing out farther and farther from home, and was under the impression that everything was "fine"...... until I went in for a state inspection.
They drove her around back for the inspection, and I waited up front. I know they left her on/idling the whole time as I could hear from where I was sitting.
The brought her back to the front, shut off the engine, and I was about to leave when she wouldn't start. I looked at the temp gauge, and she was ~220 - way hotter than I had ever seen it.
- the radiator cap never released, and I didnt have an infrared gun to check temp. I waited about an hour for her to cool down, occasionally cranking the starter to let the water pump do it's thing and move the water around. Temp gradually dropped to 160, and I got it started and rushed home.
- I checked the accelerator pump during the hour, and I never lost gas. However, I never checked for spark.
My questions:
What happens when the block gets hot that would prevent a restart? Do piston tolerances change with the heat to mess with compression?
or something much more simple like the coil overheating?
#24
Le Mans Master
I'm surprised with that much space between the fan shroud and the tip of the fan that your car didn't overheat after idling for such a long time. There should be less than an inch between the shroud and fan. Picture of my '67 with 18" fan.
#25
Heat riser is wired open.
Heat passages in the intake are not plugged under the carb. This is on my to-do list....
Stock fan shroud with new rubber seal on the bottom when I replaced the radiator.
I went with the Stage 1 EMP water pump, but now that I'm looking back at the details, it does say "high volume".
https://www.summitracing.com/parts/EMP-12103
Stock Fuel filter mounted on top of the intake.
Carter 3721 "stock" carb.
Here are some pictures:
Heat passages in the intake are not plugged under the carb. This is on my to-do list....
Stock fan shroud with new rubber seal on the bottom when I replaced the radiator.
I went with the Stage 1 EMP water pump, but now that I'm looking back at the details, it does say "high volume".
https://www.summitracing.com/parts/EMP-12103
Stock Fuel filter mounted on top of the intake.
Carter 3721 "stock" carb.
Here are some pictures:
#26
Race Director
Member Since: Feb 2007
Location: northern california
Posts: 13,741
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C2 of Year Finalist (track prepared) 2019
You've got the wrong alternator pulley for the deep groove WP and crank pulleys. With the right alt. pulley, your fan belt will go on the front sheaves and will be perfectly aligned. It isn't now.
#28
Race Director
Member Since: Feb 2007
Location: northern california
Posts: 13,741
Received 6,745 Likes
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3,076 Posts
C2 of Year Finalist (track prepared) 2019
#30
Instructor
#31
Le Mans Master
#32
Instructor
Thread Starter
As far as the fan goes, I have no clue why I have 3 finger gap on top, but only 1 finger on the side. I’ll check the size
#33
Instructor
correct antque cars are exempt from annual inspection, they are required to have an inspection every 5 years!