I decided to put together a rough assembly drawing for a homemade overflow canister. It can be made with supplies from your local hardware store for less than $10. Many of use probably have the material scattered throughout our garages... It is a rough design, something I just threw down on "paper". I have not actually made one, so I could be off a bit. I have a polished aluminum one, which is where the theory of operation comes from.
Basically, when coolant overflows the radiator cap, it will enter the overflow cainster from near or at the bottom. As the level continues to rise, if there is too much coolant for the canister to contain, it flows down the small tube inside the canister, out thru the fitting in the bottom. As the engine cools, it draws the coolant back thru the fill tubing into the radiator.
I haven't worked out the mounting scenario, but that can be accomplished with a bit of creativity.
Let me know what you think, if you have any design improvements.
http://members.aol.com/mlnielsen/homemade_overflow.jpg
Basically, when coolant overflows the radiator cap, it will enter the overflow cainster from near or at the bottom. As the level continues to rise, if there is too much coolant for the canister to contain, it flows down the small tube inside the canister, out thru the fitting in the bottom. As the engine cools, it draws the coolant back thru the fill tubing into the radiator.
I haven't worked out the mounting scenario, but that can be accomplished with a bit of creativity.
Let me know what you think, if you have any design improvements.
http://members.aol.com/mlnielsen/homemade_overflow.jpg