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By the way Jim...
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Posted by Steven Pfaff (more from Steven Pfaff) on Tue, 15 Sep 2009 12:42:24 Share Post by Email
In Reply to: Re: E85 has much higher octane numbers, Steven Pfaff, Tue, 15 Sep 2009 08:53:12
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Flex fuel vehicles use a sensor known as a fuel composition sensor, and sometimes referred to simply as a flex fuel sensor, so they do in fact measure the fuel composition. As far as adjusting spark timing, that still is dependent on the ECU's program. I'm sure you'll agree that ignition timing will only be adjusted to a certain point, beyond which efficiency will be lost if the timing is not ideal. Now, it's possible that flex fuel vehicles are able to maintain ideal ignition at any fuel composition, but I can't help but wonder if that is indeed the case. I know that when Jak wrote my program he programmed an extra 5' of ignition timing. Now I understand that this doesn't effect thermodynamics, but I do believe that in naturally aspirated engines, although they don't have the ability to alter or control thermodynamics, there are ways to better monitor and control the overall efficiency.

Maybe engineers could wise up a bit and start to combine some of these technologies that make other engines more powerful and effiecient. Maybe more vehicles should utilize small turbochargers, and all engines should be equipped with electronically controlled valve timing and switchable intake manifolds.

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