C1 & C2 Corvettes General C1 Corvette & C2 Corvette Discussion, Technical Info, Performance Upgrades, Project Builds, Restorations

[C1] Exhaust Manifold excessive temp

Thread Tools
 
Search this Thread
 
Old 04-23-2018, 04:28 PM
  #21  
pop23235
Safety Car
 
pop23235's Avatar
 
Member Since: Feb 2012
Location: Glen Allen VA
Posts: 4,965
Received 1,020 Likes on 680 Posts

Default

Originally Posted by Frankie the Fink
I just put my palms over my tail pipes while the engine was running and the exhaust felt too hot to me.....should I run a colder range plug ?

I'm thinking ACR44s would cool things down...
Absolutely not! You need to change your thermostat to a 160* one.
Old 04-23-2018, 05:08 PM
  #22  
MikeM
Team Owner
 
MikeM's Avatar
 
Member Since: Mar 2003
Location: Greenville, Indiana
Posts: 26,118
Received 1,843 Likes on 1,398 Posts

Default

I think he didn't get the answer he was looking for and left?
Old 04-23-2018, 05:09 PM
  #23  
wmf62
Race Director
 
wmf62's Avatar
 
Member Since: Jun 2006
Location: Inverness FL
Posts: 17,891
Received 727 Likes on 621 Posts
St. Jude Donor '07

Default

Originally Posted by Frankie the Fink
I just put my palms over my tail pipes while the engine was running and the exhaust felt too hot to me.....should I run a colder range plug ?

I'm thinking ACR44s would cool things down...
Frank

43's would be even better...

Bill
Old 04-23-2018, 05:15 PM
  #24  
MikeM
Team Owner
 
MikeM's Avatar
 
Member Since: Mar 2003
Location: Greenville, Indiana
Posts: 26,118
Received 1,843 Likes on 1,398 Posts

Default

Maybe the neighbor's kid stuffed a potato up your tail pipe?
Old 04-23-2018, 05:19 PM
  #25  
DUB
Race Director
 
DUB's Avatar
 
Member Since: Apr 2009
Location: Charlotte NC
Posts: 19,294
Received 2,713 Likes on 2,321 Posts

Default

Originally Posted by pop23235
Absolutely not! You need to change your thermostat to a 160* one.
Changing the thermostat to a 160 degree is NOT going to lower the temperature. It will only cause the thermostat to open sooner and circulate coolant....but the end will still be the same given enough run time.

Because the only thing you are changing is when the thermostat is opening....and IF the coolant systems till has issues... it will still go up to the temps where it was....because once the thermostat is fully open...it no longer is a factor in this equation.

DUB
Old 04-23-2018, 05:23 PM
  #26  
DUB
Race Director
 
DUB's Avatar
 
Member Since: Apr 2009
Location: Charlotte NC
Posts: 19,294
Received 2,713 Likes on 2,321 Posts

Default

Oh heck. I though the the OP would still be around to see these photos of an exhaust manifold I had replaced a long time ago.

In the last photo you can see how much the manifold is bulging out.

CLEARLY and oh so 'Captain Obvious' that there was something wrong that caused this.









DUB
Old 04-23-2018, 06:16 PM
  #27  
MikeM
Team Owner
 
MikeM's Avatar
 
Member Since: Mar 2003
Location: Greenville, Indiana
Posts: 26,118
Received 1,843 Likes on 1,398 Posts

Default

Originally Posted by DUB
Changing the thermostat to a 160 degree is NOT going to lower the temperature. It will only cause the thermostat to open sooner and circulate coolant....but the end will still be the same given enough run time.

Because the only thing you are changing is when the thermostat is opening....and IF the coolant systems till has issues... it will still go up to the temps where it was....because once the thermostat is fully open...it no longer is a factor in this equation.

DUB
You are taking this thread a little too seriously me thinks.

But considering the unknowns that the OP hasn't addressed..................

Last edited by MikeM; 04-23-2018 at 06:18 PM.
Old 04-23-2018, 06:34 PM
  #28  
DUB
Race Director
 
DUB's Avatar
 
Member Since: Apr 2009
Location: Charlotte NC
Posts: 19,294
Received 2,713 Likes on 2,321 Posts

Default

Originally Posted by MikeM
You are taking this thread a little too seriously me thinks.

But considering the unknowns that the OP hasn't addressed..................
This may be possibly true....but heck....I am just that way...and I am only responding to those replies that in my opinion need responses and could cause the OP to go down a path of wasting their time and money.

Because as you very well know..not all repairs are 'cut and dry'.

DUB

Last edited by DUB; 04-23-2018 at 06:35 PM.
Old 04-23-2018, 09:25 PM
  #29  
65tripleblack
Safety Car
 
65tripleblack's Avatar
 
Member Since: May 2003
Location: Ocean Township NJ
Posts: 4,797
Received 235 Likes on 212 Posts

Default

Originally Posted by DUB
Oh heck. I though the the OP would still be around to see these photos of an exhaust manifold I had replaced a long time ago.

In the last photo you can see how much the manifold is bulging out.

CLEARLY and oh so 'Captain Obvious' that there was something wrong that caused this.









DUB
This would have solved your problem:
Attached Images  
Old 04-24-2018, 12:57 AM
  #30  
wmf62
Race Director
 
wmf62's Avatar
 
Member Since: Jun 2006
Location: Inverness FL
Posts: 17,891
Received 727 Likes on 621 Posts
St. Jude Donor '07

Default

Originally Posted by 65tripleblack
This would have solved your problem:
WHAT is THAT?

Bill
Old 04-24-2018, 08:59 AM
  #31  
DUB
Race Director
 
DUB's Avatar
 
Member Since: Apr 2009
Location: Charlotte NC
Posts: 19,294
Received 2,713 Likes on 2,321 Posts

Default

Originally Posted by 65tripleblack
This would have solved your problem:
SEE...the internet comes to the rescue. Too bad that it was not a common thing as like it is today or I WOULD have tried that.

Do you not think that hood clearance may become a factor???

DUB
Old 04-24-2018, 09:13 AM
  #32  
65tripleblack
Safety Car
 
65tripleblack's Avatar
 
Member Since: May 2003
Location: Ocean Township NJ
Posts: 4,797
Received 235 Likes on 212 Posts

Default

Originally Posted by wmf62
WHAT is THAT?

Bill
It was a dealer installed option that would cause the engine exhaust to play the Civil War "charge" call. On the opposite manifold, one could opt to install another device which would play "taps". If The exhaust crossover was plugged, then both would play WWII German war marches in 2 keys.

Last edited by 65tripleblack; 04-24-2018 at 09:17 AM.
Old 04-24-2018, 09:13 AM
  #33  
Dave Tuten
Advanced
Thread Starter
 
Dave Tuten's Avatar
 
Member Since: Feb 2012
Location: Greenville NC
Posts: 88
Received 0 Likes on 0 Posts
Default exhaust heat high

Originally Posted by tbarb
Dave,

You might try a vacuum advance distributor and connect the vacuum advance to a full manifold source. This additional timing at idle speeds may reduce the temperature of the exhaust because the combustion process is started earlier so the heat energy pushes on the piston instead of being pushed out the exhaust.
Thank you for the info....
Old 04-24-2018, 09:14 AM
  #34  
65tripleblack
Safety Car
 
65tripleblack's Avatar
 
Member Since: May 2003
Location: Ocean Township NJ
Posts: 4,797
Received 235 Likes on 212 Posts

Default

Originally Posted by DUB
SEE...the internet comes to the rescue. Too bad that it was not a common thing as like it is today or I WOULD have tried that.

Do you not think that hood clearance may become a factor???

DUB
Only with raised exhaust ports, which required a hole in the bonnet.
Old 04-24-2018, 09:38 PM
  #35  
pop23235
Safety Car
 
pop23235's Avatar
 
Member Since: Feb 2012
Location: Glen Allen VA
Posts: 4,965
Received 1,020 Likes on 680 Posts

Default

Had me worried for a bit Dub 😉
Old 04-25-2018, 06:33 PM
  #36  
DUB
Race Director
 
DUB's Avatar
 
Member Since: Apr 2009
Location: Charlotte NC
Posts: 19,294
Received 2,713 Likes on 2,321 Posts

Default

Originally Posted by pop23235
Had me worried for a bit Dub 😉
I am glad it only lasted a 'bit'....because..I worry about me quite often from time to time...and sometimes it lasts for a long time.

Sometimes these cars can me me feel like I am

DUB
Old 05-18-2018, 06:42 PM
  #37  
Dave Tuten
Advanced
Thread Starter
 
Dave Tuten's Avatar
 
Member Since: Feb 2012
Location: Greenville NC
Posts: 88
Received 0 Likes on 0 Posts
Default

Originally Posted by Frankie the Fink
The premise seems to be that if your engine exhaust manifolds are running above 450* there is something wrong.

In 50 years of working on all manner of cars, motorcycles and boats, old and new, I never felt the need to measure exhaust manifold temperature. In fact, I don’t remember anyone that did. Largely because there wasn’t an easy way to do it for the home hobbyist. So, nobody worried about it.

So now we have this guy swapping parts with no other symptom of abnormality except what’s based on an internet opinion of what is normal exhaust temperature.

Yeah, I totally get it.
Thank you sir. Didn't swap parts, and no, I don't think you "get" it.



Quick Reply: [C1] Exhaust Manifold excessive temp



All times are GMT -4. The time now is 08:19 AM.