[Land-speed] A question for the list.

Neil Albaugh neil at dbelltech.com
Sat Apr 6 08:29:30 MDT 2013


Bryan;

My Buick Lacrosse has direct injection but I don't know what its compression 
ratio is.

Regards, Neil  Tucson, AZ

-----Original Message----- 
From: Bryan Savage
Sent: Friday, April 05, 2013 3:25 PM
To: List Land Speed
Subject: [Land-speed] A question for the list.

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
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