I don't know exactly how much coolant it will take - could be as much as 2.5 gal.  All depends on the size of the hoses, radiators etc. 

I do know that you can easily think it is full enough and still have air trapped in the water pump - this has resulted is some builders having to rebuild the motor!!
I installed a radiator drain valve in the top of the water pump outlet.  When I refill my system, I open the valve and leave it open until coolant leaks out during the fill process.   After installing and using the valve I have not had any problem with air trapped in the pump.

You should also make sure the water pump outlet hose and return hose feel warm during the first few minutes of running.  This confirms there is coolant flow to the radiator.

Dennis H.
Reneisi/RV-7A

kevin lane wrote:

how much does a renesis hold approx?  I have been priming my engine for a first run.  the first gallon seemed to all go into the radiator.  today a second gallon seemed to empty into the block, once I loosened the bubble line from the front rotor back to the expansion tank.  I've been cranking the engine, tho' I doubt it pumps much at such slow rpm.  my expansion tank is the highest point in the cooling system. [by 3"?].   just wondered how much air might still be trapped.  I realize that I will need to run it a bunch to get all the air out.   any big problems [besides noise and burning up my trailer floor] with not having a complete exhaust system yet?  I have the exhaust manifold going back and then pointing straight down at the mock-up firewall.

 

 

KevinLane Carpentry
www.KevinLaneCarpentry.com