[Land-speed] A question for the list.

[Bryan Savage]

Here is a nice off the wall question for the list.

A few recent engines have 13 to 1 compression ratios and burn 87 octane 
unleaded gasolinewithout pinging or detonation. One is also 
turbocharged(possiable memory failure here.)
They have what I believe is called direct or solid injection where the 
fuel is sprayed into the combustion chamber not the intake port.
The only way I can see this working is if the fuel is ignited by the 
spark plug as it is sprayed into the combustion chamber. This would 
prevent combustionable fuel from reaching End Gas areas of the 
combustion chamber where it can detonate.

So my question is, what have I got screwed up????  Anything --- 
everything????

Thanks folks,
Bryan Savage