Intake manifold temps

[tucknroll]

First of all, I have to apologize that I haven't driven the car in more than several years so I don't recall. How high does the temp of the actual log reach? Speculation is welcomed, actual readings would be super!
Thx

 

[BUZZ]

This is just a speculation but I'd like to know how close I really am. With the engine running I'd guess about 198* with a 195* thermostat. With the motor off after heat soak for about 5 min. I'd guess about 200*-210*

 

[falcon60]

I've checked mine. Around town in summer traffic the log will be 220-250 degrees except right under the carb mount where the exhaust heat is greatest.There it will be nearly 300 degrees. Shut the engine off hot and take the under-carb temp after 3-4 minutes and 350-375 is common.
THAT is why fuel boils in carbs during hot-soak conditions.

Terry

 

[60s Refugee]

That's why I'm thinking hood scoop. Even though the header is ceramic coated, the engine bay is much hotter now. When I open the hood I can really feel a difference. Even the air filters are too hot to touch. I think I'll try a temp reading too.

Harry

 

[BUZZ]

Boy, was I off. What did you use to take those temps? I was going to try it with a IR temp gun but figured that the exhaust manifold would give it a false reading. So I just tried a spit sizzle test it never sizzled

 

[Bort62]

Boy, was I off. What did you use to take those temps? I was going to try it with a IR temp gun but figured that the exhaust manifold would give it a false reading. So I just tried a spit sizzle test it never sizzled

Btw, the spit sizzle test is more accurate than you think.

I would be curious to know what you measured those temperatures with. 375 F is extremely high.

 

[Harte3]

Best not try a pee sizzle test though...

 

[Bort62]

Best not try a pee sizzle test though...

Boiling pee smells extremely foul.

 

[tucknroll]

Boiling pee smells extremely foul.

I'm not sure I want to ask how you know that :roll:

 

[Bort62]

Boiling pee smells extremely foul.

I'm not sure I want to ask how you know that :roll:

Don't drink and BBQ.

 

[60s Refugee]

We used to pee on the radiators in the boys room at school. Did a real number on the kids passing in the halls!

Harry

 

[falcon60]

Boy, was I off. What did you use to take those temps? I was going to try it with a IR temp gun but figured that the exhaust manifold would give it a false reading. So I just tried a spit sizzle test it never sizzled

Btw, the spit sizzle test is more accurate than you think.

I would be curious to know what you measured those temperatures with. 375 F is extremely high.

I checked first with an IR gun,then when the results were so high I retested with a thermocouple,heat sink compound and a dvm. Same temps,so it's really that hot. The exhuast manifold sharing a common wall with the intake under the carb really cooks it.

Terry

 

[tucknroll]

Well that sounds like it would be pretty accurate.
I was guessing around 300-350 max. But I was thinking while the engine was running, not while it was stopped. I didn't take into account the cooling system doing its job while the engine was on. :roll:

 

[addo]

It's a good pointer of how the water-filled carb spacer can work, or the water jacket in a 2V manifold.

Thanks to Terry for sharing those numbers.

 

[Bort62]

It's a good pointer of how the water-filled carb spacer can work, or the water jacket in a 2V manifold.

Thanks to Terry for sharing those numbers.

indeed.

 

[60s Refugee]

Taking your word for it is much better than touching it and getting burnt!

 

[Quick 8]

I guess disconnecting the water feed from the carb spacer isn't exactly a "performance modification" then.

I bypassed the spacer and mine is running like crap after it is fully warmed up. Maybe that is the reason?

With temps like that it sounds like the fuel would be boiling in the carb.

 

[fordconvert]

My spacer was hooked up last year but isnt this year and I have not noticed any difference. I dont remember the numbers but with my IR gun I was not reading anything higher than coolant temp around the top of the intake or base of the carb.

 

[BUZZ]

falcon60 where those temps with a header or cast manifold?

 

[falcon60]

Cast '68 manifold and running 2" exhaust with a decent low-restriction muffler.

Terry