Engine is spitting anti freeze through catch tank

[michel schryer]

My catch tank is not very big and I fill the system to the brim, also I fill the catch tank half . I might put too much liquid in like you said, no room for expansion because when i do that I come back from a ride and it spitted it out, I will try with less coolant until it doesn't spit it out and if it doesn't overheat it means i was filling the system too much. My temperature is 190 degree Celcius on the temp gauge stable when hot outside. I have no leaks just a little sippage at the thermostat gasket that i have to replace, it didn't seal right i guess. It's been like that since the beginning and I've replace the stock heads with gt-40's. I think it's a lack of understanding. Thanks for any ideas, I really appreciate

Originally Posted by Z-linkCobra

What are the temp readings when your having this problem? If its not getting hot then you could have too much water in the system. I know that sounds ass backwards but you need some room for expansion. Empty your catch can and as long as your not getting hot let it level itself out. I have had several cars through the years that would spit coolant down to a certain level and be just fine.

Is this a new build or something you have run for some time? If its a new build and its getting hot your head gaskets may be installed wrong.