Although I am still quite a way off from installing the engine in the car and subsequently plumbing in the cooling system, I have started to think about how I might approach it so that I do all the required fabrication before I paint the engine bay or powder coat the engine frame.
R1 Bike Setup
The standard R1 Setup is reasonably straight forward once you have the required diagrams (found in the Yamaha Service Manual). The cooling systems consists of;
- Water pump (located bottom-right-hand side of engine)
- Oil cooler (located bottom-front of engine)
- 2No. outlets on engine head
- Thermostat housing
- Automatic choke
- Radiator catch tank
I'm sure Yamaha spent a lot of time and money designing the cooling system so where possible I would like to keep my car installation the same.
I have seen some people remove the thermostat altogether but I plan to keep the bike thermostat housing and stat. I might have to change the stat for a different temperature rating.
Most Mini R1 install pictures I have seen show the oil cooler outlet pipe connecting to the head outlet pipes before going into a thermostat/top-feed of radiator. Again, I don't want to deviate too far from the Yamaha design so I will keep the oil output going into the bottom rad input (the filler cap side)
Filling & Bleeding The System
The radiator on the bike would have been installed higher than the engine however it will be lower than the engine head in my Mini so I need to add an expansion tank as the new highest point to help with filling the system and getting rid of air locks.
I also want to retain the standard interior heater if possible so I spent some time studying various cooling system designs including the standard MPI setup I previously had installed. I came up with two possible designs.
Option 1 - Loop Heater out Rad Bottom Hose
Option 2 - Loop Heater out/In Head outlets
In both designs I have added an expansion tank by connecting into the rad bottom hose for tank coolant output and the rad top outlet that would have been connected to the old catch tank for coolant/air return to expansion tank.