Pumpkinduster
Well-Known Member
Hey all I am just looking to pick some brains here.
I have a 74 Duster with a mild built 318. The motor has been fully worked over from ground up with about 300 miles on it total. I am bored .30 over, block decked, 302 heads, comp cam Xtreme Energy 224/230, Summit long tube headers, Edlebrock performer RPM intake, and an Edlebrock 1405 4bbl carb.
Cooling system has been upgraded to 3 row aluminum radiator by Champion cooling with an aluminum shroud and dual 10in fans (currently on with ignition), the cap is a 16lbs cap. High flow water pump installed yesterday as well as a 160 high flow thermostat. I am testing distilled water with 10-15% coolant. But ultimately I am still getting/ having cooling issues.
Today I let it warm up to 160 and can see some coolant flow in the radiator. At an idle it got to about 170ish which I expected since it is 85 out and the pavement is hot.
As soon as I start creating more heat (throttle) the temp goes up, so I took it for a test drive. I went about 5 miles averaging about 45-50 mph. Temp climbed to about 180 and held for about a mile then anytime I gave it a little more gas the temp just keeps climbing. I eventually made it about 4 miles before I pulled over because the temp started hitting 205 and I was getting some vapor lock. (I have a full EFI conversion for the winter project) So i parked in the shade for about 10 minutes and popped the hood to let some heat expel then fired it up and finished the drive. The temp when starting it was about 199 and on the rest of the drive it dropped to about 197 until I hit my driveway 203.
I haven't checked it at cruising speeds yet just because it is supposed to be 100 out today so I don't feel the need to push it.
But is the accumulation of the heat under the hood (Headers) causing a lot of this issue or is it temp climbing solely from the internals getting that hot?
I have a 74 Duster with a mild built 318. The motor has been fully worked over from ground up with about 300 miles on it total. I am bored .30 over, block decked, 302 heads, comp cam Xtreme Energy 224/230, Summit long tube headers, Edlebrock performer RPM intake, and an Edlebrock 1405 4bbl carb.
Cooling system has been upgraded to 3 row aluminum radiator by Champion cooling with an aluminum shroud and dual 10in fans (currently on with ignition), the cap is a 16lbs cap. High flow water pump installed yesterday as well as a 160 high flow thermostat. I am testing distilled water with 10-15% coolant. But ultimately I am still getting/ having cooling issues.
Today I let it warm up to 160 and can see some coolant flow in the radiator. At an idle it got to about 170ish which I expected since it is 85 out and the pavement is hot.
As soon as I start creating more heat (throttle) the temp goes up, so I took it for a test drive. I went about 5 miles averaging about 45-50 mph. Temp climbed to about 180 and held for about a mile then anytime I gave it a little more gas the temp just keeps climbing. I eventually made it about 4 miles before I pulled over because the temp started hitting 205 and I was getting some vapor lock. (I have a full EFI conversion for the winter project) So i parked in the shade for about 10 minutes and popped the hood to let some heat expel then fired it up and finished the drive. The temp when starting it was about 199 and on the rest of the drive it dropped to about 197 until I hit my driveway 203.
I haven't checked it at cruising speeds yet just because it is supposed to be 100 out today so I don't feel the need to push it.
But is the accumulation of the heat under the hood (Headers) causing a lot of this issue or is it temp climbing solely from the internals getting that hot?