Engine noises

[pokrefke@ocean.st.usm.edu]

Yesterday I noticed a strange sound from my engine.  On hard accleration, the
engine makes a slight rapping noise.  I have not changed the timing or any other
variable with my engine.  The only possible explanation I can come up with is 
water
in my fuel.  I filled up Monday with 93 octane - if there was water in the gas,
would it make my engine "ping"?

Thomas James Pokrefke, III (T-minus 7 days and counting until graduation)
1970 MGB
pokrefke@ocean.st.usm.edu
http://ocean.st.usm.edu/~pokrefke