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Re: >>> what octane do you fuel your SE with? >>> Posted by Adam [Email]  (#344) [Profile/Gallery]
(more from Adam) on Sat, 2 Jun 2001 09:39:19
In Reply to: >>> what octane do you fuel your SE with? >>>, salvo, Thu, 31 May 2001 18:04:43 Members do not see ads below this line. - Help Keep This Site Online - Signup |
High octane fuel burns slower, cleaner and in a more precise way (to prevent knocking). It also has compounds in it that help to keep the engine cleaner than regular fuel.
FYI-
Octane rating is a measure of a gasoline’s anti-knock properties in a liquid motor fuel. The rating represents iso-octane (octane rating of 100) volume in a fuel consisting the mixture of iso-octane and normal heptane (octane rating of 0).
A high-performance car is design to take advantage of higher-octane-rating fuel. However, higher-octane-rating fuel does not work efficiently on every car. Many people are willing to pay $0.20/gallon more for premium unleaded (octane rating of 92 or 93), believing that it is better for their cars. Again, nevertheless, higher octane fuel is only needed by high-compression, high-performance sports or luxury cars. Therefore, unless they have those kind of cars, their cars will run just fine on lower-octane-rating fuel (regular unleaded, octane rating of 87 or 89).
The octane number is an important measurement in evaluating the gasoline because it permits increases in engine compression ratio. During the engine compression cycle, knocking sound is produced by an internal combustion engine when fuel ignites spontaneously and prematurely (preignition) in an engine’s combustion chamber. Consequently, the piston will be forced down when it should be traveling upwards on its compression stroke. Low-octane fuel is often associated with this problem because it burns faster than high-octane fuel.
Knocking is determined largely by the chemical structure of fuel hydrocarbons. Straight-chain paraffins are recognized to be more prone to knocking than branched-chain paraffins, olefins, or cyclic hydrocarbons. Similarly, cycloparaffins (naphthenes) are more knock-prone than aromatics. To overcome the problems, negative catalysts and the antiknock compounds are often used to slow precombustion reactions that might convert fuel hydrocarbons to autoigniting, detonating compounds.
Bottom line... The high octane fuel is much better for a turbo/high performance engine but 87 will work in a pinch. You wouldn't catch me putting "regular" fuel in a very specialized or turbo charged engine. It doesn't make sense to give up that added performance.
, Sat, 2 Jun 2001 09:39:19 <-- Viewing This Message
, Fri, 1 Jun 2001 10:50:10
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