The octane rating is based on results using a test engine. It is the resistance to autoignition that is being measured. Autoingition is undesirable in a gasoline engine as this produces knocking. It is called an octane rating as iso-octane is defined as 100 and n-heptane is defined as 0. So a mixture of 87% iso-octane and 13% n-heptane would have an octane rating of 87%. However that doesn't mean that a fuel with a 97 octane rating has 97% octane, it just has characteristics as if it was 97% octane and 3% n-heptane.
Showing posts with label octane. Show all posts
Showing posts with label octane. Show all posts
Wednesday, May 14, 2008
Octane Rating
Just a little FYI. I was stumped today on what exactly an octane rating on gasoline meant.
The octane rating is based on results using a test engine. It is the resistance to autoignition that is being measured. Autoingition is undesirable in a gasoline engine as this produces knocking. It is called an octane rating as iso-octane is defined as 100 and n-heptane is defined as 0. So a mixture of 87% iso-octane and 13% n-heptane would have an octane rating of 87%. However that doesn't mean that a fuel with a 97 octane rating has 97% octane, it just has characteristics as if it was 97% octane and 3% n-heptane.
The octane rating is based on results using a test engine. It is the resistance to autoignition that is being measured. Autoingition is undesirable in a gasoline engine as this produces knocking. It is called an octane rating as iso-octane is defined as 100 and n-heptane is defined as 0. So a mixture of 87% iso-octane and 13% n-heptane would have an octane rating of 87%. However that doesn't mean that a fuel with a 97 octane rating has 97% octane, it just has characteristics as if it was 97% octane and 3% n-heptane.
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