I have a 1.4SS that I use for occasional track days. When I bring the car in after a session, the engine sounds fine, but when I restart it after a 10 minute cool down, it sounds very "tappety". The tappety noise eventually goes after afew minutes. The noise seems to get worse as the day wears on, but only happens for the few minutes after restarting, and when the engine is hot.
Any ideas why this may be happening? Should I worry?