MotoGP NEWS Guru
Not that kind of "seize"... In an interview with Pieor Soatti, Aprilia Product Development engineer, Motorcycle Daily reported the following excerpt from the interview:
TS: Tell me a little bit about how you test a new engine such as the SL750?
PS: One of the most important things that we do is the bench testing at the factory. Every new engine is run for 50,000 kilometres before being put into production. This is very important for reliability.
TS: Have you got any examples of changes you have had to make after this reliability bench test?
PS: Yes, many, but specific to the SL750 we had a problem with cooling the rear cylinder in the beginning. On the road tests this problem didn't really show up correctly. But when the engine was stressed at high revs for a long time in the bench we had some engine seizures. These seizures were caused by water not circulating properly at the back of the rear cylinder-Causing it to overheat. We solved the problem by introducing a direct water line to the rear cylinder.
50,000 kilometres is always our test as very few motorcycles actually do so many miles. But we once tried a Honda CBR1000RR engine on our bench and it never died! It was impossible to seize that engine under normal service circumstances. As an engineer I was impressed and I respect what the Japanese do.