I used a 38mm x 22mm copper solder-ring reducing Tee with a 22 x 15 reducer to fit the large pipe from the header which worked very nicely (the solder ring flare helps with hose retention). I stuck with the H20 piping from Marlin (to save money really) and haven't had any overheating issues due to flow rate, even hammering it in hot weather.
If you search on the site you will find the trouble I had with airlocking in my radiator though, which did lead to some dramatic overheating! I found it was due to air being drawn back into the engine head from my expansion bottle (through the small pipe). I added a dip pipe in the bottle and have solved the problem, but never did work out why mine suffered from this and John's (alackofspeed) didn't.
|