by ANDYC Thu 09 May 2019, 7:40 pm
A bit of progress made now, it seems an age since the engine was pulled apart to fit the larger valves but if I explain all will become clear (maybe)!
As I said, I ordered some stage 2 race cams. The larger valves went in and I did a pressure leak down test to get everything spot on, as you do. The results were great
, HOWEVER!!!!, what I really should have forseen was that to raise the lift on the cams as they were reground rather than from new blanks, the base circle had to be reduced. Which meant that larger shims are needed to get the correct clearance, MUCH larger shims (read TOO large)
I could have got shims large enough from other models but knowing I wouldn't have been happy with it.
I had to bite the bullet and order a new set of valves to be made up with longer stems to bring it back into an acceptable range.
The sump had to come off so I could retrieve a bolt that I dropped in whilst trying to fit it behind the cam chain tensioner blade, how I wished that I hadn't bothered with titanium as I could have fished it out with a magnet. On the positive side the exhaust was designed so I could take off the sump without needing to remove that. Not that I want to have to do it regularly you understand!
The cooling system is now all connected and the oil cooler is bypassed on the water side for the moment, I'm concentrating on getting the engine up and running before anything else.
Next stage is the electrics and then the carb jetting.