[Land-speed] A question for the list.

[Ron Gibson]

Bryan
I think one of the late issues of Hot Rod explained this when telling about
the new GM engine. Don't remember for sure,read the article, (don't know if
it's stupidity or old age why I don't remember),seems like fuel is injected
late and not subjected to compression heat to lower detonation tendencies.
Also special piston dome shape to control flow.

Ron


On Sat, Apr 6, 2013 at 9:29 AM, Neil Albaugh <neil at dbelltech.com> wrote:

> 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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