Historical Article - March 1992 - Tip Time by Keith Calver
Some years ago whilst racing in the National Mini Miglia Championship I came across an odd problem that had me a little puzzled for a while.
I built a new engine ready for the beginning of the season from all new parts except for the block, crank and head casting. I duly ran this in a Snetterton, calling in to visit Peter Baldwin at Marshalls of Cambridge for a final rolling road tune up.
The engine performed faultlessly for 4 races, giving good power and was very smooth, allowing me to use 9,100 rpm on occasions. At the next race meeting I went out to do the practice session, did a few warming up laps, then registered a vibration from the engine. Oil pressure OK, water temperature OK, but it would not pull any rpm and got very rough over 5,500 rpm!