Has anyone done any research why 7 of the 17 water jacket passages between the block and head are completely blocked by the gasket, while another 4 only have a tiny passage hole?
On other notes:
I've been chasing an overheating problem in my RF93 since I got it up and running last month. I had it out for a test and race wknd, and once I solved (or at least diminished) the oil leaks and electrical gremlins, I finally got some good laps in. Problem is it goes through about 3/4 gallon of water in 10 minutes of running, then starts to overheat. No signs of water leakage around radiators, water pump, or water inlet. Cooling system bled and radiator bleeds working properly. Radiators seem to warm up at the expected rate. No water in the oil. No signs of combustion contaminants in the water. Rad cap holds normal pressure, starts to bleed out steam/water when the system overheats.
Since I ran into the cyl head stud issue where you can't remove the head in situ, I just re-torqued the head bolts, tried improving the airflow across the radiators, and went back out last weekend, to the same results. Runs great for 3-4 laps, then overheats and water level is almost a gallon low.
Pulled the motor today expecting to see a bad head gasket or a crack in the head or bore. Nothing looks abnormal. Good gasket, no water trails between water jackets and combustion chamber, no visible cracks in the usual expected places. So where is my water going???
Also two other issues. One of the oil leaks appears to be the rear crank seal. Are they replaceable with the motor assembled?
Found a crack in the bellhousing starting at the starter mounting surface half way between two of the starter bolts, and traveling rearward a few inches. Plan to just clean it out and weld it up.