The Ford Barn - View Single Post - Confessions of a Model A Modifier

Cajun · 06-27-2010, 06:32 AM

I have lots of the modifications you mentioned. Add to that a lightened flywheel.

I recently removed the radiator overflow. I am searching for a ghost problem. I did the normal dumb thing by changing two things at once. I installed the radiator overflow with a sealed radiator cap and I changed from aluminum to cast head. After these changes, I could no longer run with 50% antifreeze without running hotter when pushing the car. It runs cool with 20%. The jury is still out on the overflow causing the problem.

The reason I suspected the over flow is that it caused the water pump to run at slightly higher head pressure. Centrifugal pumps will pump less with higher head. I don't know if the slight difference is enough to cause this problem.

06-27-2010, 06:32 AM	#3
Cajun Senior Member Join Date: May 2010 Location: Plano, Texas Posts: 104	Re: Confessions of a Model A Modifier – Model A Upgrades? I have lots of the modifications you mentioned. Add to that a lightened flywheel. I recently removed the radiator overflow. I am searching for a ghost problem. I did the normal dumb thing by changing two things at once. I installed the radiator overflow with a sealed radiator cap and I changed from aluminum to cast head. After these changes, I could no longer run with 50% antifreeze without running hotter when pushing the car. It runs cool with 20%. The jury is still out on the overflow causing the problem. The reason I suspected the over flow is that it caused the water pump to run at slightly higher head pressure. Centrifugal pumps will pump less with higher head. I don't know if the slight difference is enough to cause this problem.