68 over heating after upgrades
06-14-2011, 06:14 PM
#12
6th Gear Member
Join Date: Jan 2007
Location: AR
Posts: 5,469
IMO, your TWO ROW copper radiator is your weak point.... (I think it is even marginal for a stock V-8)
I think a 3 row copper or a true (big tube) 2 row aluminum would help with your cooling capacity.
The fact that it worked ok with your cast iron heads does not mean that it is sufficient with your new heads. I BELIEVE that aluminum heads place a greater load on the cooling system than cast iron, plus the improved performance of your car will make more heat.
I had stated in the other thread that I don't worry much about temps as high as 220* or even 230* when not accompanied with boiling, but still your cooling system would benefit from a thicker radiator.
I think a 3 row copper or a true (big tube) 2 row aluminum would help with your cooling capacity.
The fact that it worked ok with your cast iron heads does not mean that it is sufficient with your new heads. I BELIEVE that aluminum heads place a greater load on the cooling system than cast iron, plus the improved performance of your car will make more heat.
I had stated in the other thread that I don't worry much about temps as high as 220* or even 230* when not accompanied with boiling, but still your cooling system would benefit from a thicker radiator.
07-17-2011, 10:38 PM
#14
2nd Gear Member
Join Date: May 2011
Location: NY
Posts: 183
Any resolution on these issues? My 68 is having similar issues now that I added an A/C.
Got the car back today and here is the heating issue results:
steam holes were already there. installed new high flow t'stat not sure what temp will ask later.
From shop to home is about 20 miles. When i started it was at about 150 deg, had just been test driven, temp outside was 97, left a/c off. After 8 miles driving 55 stopped for light was at 195 deg. After 8 more miles at 62 mph got up to 209 still no a/c. Slowed for next 2 mi to 35 temp dropped to 200 still no a/c.
have not checked for air in system yet waiting for it to cool down a bit. i looked for radiator shops in my area and cannot find any. Was told plastic rads put them all out of business. If i can find one what do you think about cleaning and rodding and add 3rd core or should i just buy new aluminum rad?
steam holes were already there. installed new high flow t'stat not sure what temp will ask later.
From shop to home is about 20 miles. When i started it was at about 150 deg, had just been test driven, temp outside was 97, left a/c off. After 8 miles driving 55 stopped for light was at 195 deg. After 8 more miles at 62 mph got up to 209 still no a/c. Slowed for next 2 mi to 35 temp dropped to 200 still no a/c.
have not checked for air in system yet waiting for it to cool down a bit. i looked for radiator shops in my area and cannot find any. Was told plastic rads put them all out of business. If i can find one what do you think about cleaning and rodding and add 3rd core or should i just buy new aluminum rad?
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