Radiator Cap What Is Correct??
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,852
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Your cap should be a 15lb cap. Having higher pressure will keep the car from boiling over at higher temps. You really should change this. Willcox Inc.
Pictured here: http://willcoxcorvette.com/product_i...oducts_id=8319
Pictured here: http://willcoxcorvette.com/product_i...oducts_id=8319
Thread Starter
Pro
Joined: Feb 2007
Posts: 548
Likes: 1
From: Victoria VA
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,852
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
What I’m confused about is that fact that this is a 77 and 180-195 even 210 is not considered overheating. But in your initial post you never said what the temperature was when you thought it was over heating.
“I went for a ride and it started to over heat after I got up to 50 mph. slowed down to 35 mph and temp came back down to 190.”
The foam in the radiator worries me but only a little but this could be from a few different sources, residue or spillage when doing the installation or prior issue in which flushing would cure. Based on your updated post you seem to have flushed the problem away.
As mentioned in other post, timing will play a part in how the car runs, but not only the base timing but the advanced timing.
If the car is running 180-200 I would not even worry about it on a 77. The original design of this engine is to run at higher temperature then those of the earlier cars. Even if the car was running 205-215 I’d still be fine. A stock 77 with the AC on will run between 210 and 220 provided you have the correct 15 lb cap on the radiator the car will not boil over.
The center mark on your temperature gauge is 200; the car is hot at the fourth mark which is right around 225 or 56 ohms on your sending unit.
Without knowing any of the specifics of the heads, cam and other components it’s kind of hard to know what the timing should be at, you should refer to your cam card to determine this. The heater core will have nothing to do with this either.
IMHO
Willcox Inc.
“I went for a ride and it started to over heat after I got up to 50 mph. slowed down to 35 mph and temp came back down to 190.”
The foam in the radiator worries me but only a little but this could be from a few different sources, residue or spillage when doing the installation or prior issue in which flushing would cure. Based on your updated post you seem to have flushed the problem away.
As mentioned in other post, timing will play a part in how the car runs, but not only the base timing but the advanced timing.
If the car is running 180-200 I would not even worry about it on a 77. The original design of this engine is to run at higher temperature then those of the earlier cars. Even if the car was running 205-215 I’d still be fine. A stock 77 with the AC on will run between 210 and 220 provided you have the correct 15 lb cap on the radiator the car will not boil over.
The center mark on your temperature gauge is 200; the car is hot at the fourth mark which is right around 225 or 56 ohms on your sending unit.
Without knowing any of the specifics of the heads, cam and other components it’s kind of hard to know what the timing should be at, you should refer to your cam card to determine this. The heater core will have nothing to do with this either.
IMHO
Willcox Inc.
