I am new at this so I hope this message gets to John Healy. I have rebuilt a 1969 T100T Daytona engine from ground up. It now blows oil and lots of it out of the exhaust port on left cylinder. Happens after 10 km run. No sign of wet sumping . Not coming thru head- oil feed was disconnected but no change. Oil pressure on gauge shows 60psi on start-up and 20psi at idle. Oil pressure relief valve cleaned and plunger lapped. No sign of sticking. New pistons and rings fitted- barrel rebored. Compression good. No smoking on start-up. Cam breather valve fitted and breather tube clear. Additional breather fitted without one way valve but no difference seen. Can you help find the fault? It is driving me nuts
I don't know how to phrase this delicately, but putting it in the TRIUMPH forum would be a good start ? !!
Did you gap the piston rings correctly ? And install them the correct way up ? Having a looksee at them sounds like a good plan at this stage, sounds like not all is well in that dept. Assuming the head gasket isn't the problem ?