premium fuel?
#1
#3
Many high-performance engines like the ones in the Infiniti G35 are designed to operate with a high maximum compression, and thus demand fuels of higher octane. The power output of an engine depends in part on the energy density of the fuel being burnt.
However, burning fuel with a lower octane rating than that for which the engine is designed often results in a reduction of power output and efficiency. Many modern engines are equipped with a knock sensor (a small piezoelectric microphone), which sends a signal to the engine control unit, which in turn retards the ignition timing when detonation is detected. Retarding the ignition timing reduces the tendency of the fuel-air mixture to detonate, but also reduces power output and fuel efficiency. Because of this, under conditions of high load and high temperature, a given engine may have a more consistent power output with a higher octane fuel, as such fuels are less prone to detonation.
Octane rating or octane number is a standard measure of the performance of an engine. The higher the octane number, the more compression the fuel can withstand before detonating (igniting). In broad terms, fuels with a higher octane rating are used in high performance gasoline engines that require higher compression ratios. Gasoline engines rely on ignition of air and fuel compressed together as a mixture without ignition, which is then ignited at the end of the compression stroke using spark plugs. Therefore, high compressibility of the fuel matters mainly for gasoline engines. Use of gasoline with lower octane numbers may lead to the problem of engine knocking.[1]
#6
#7
The following 5 users liked this post by ScraggleRock:
Drifter2090 (12-02-2014),
dukehotty (11-30-2014),
Eric@TCGMiami (11-28-2014),
seymore4 (12-02-2014),
thegreatkwijibo (11-28-2014)
Trending Topics
#8
I remember Bluedevils95 told me that he was sitting at the dealers long time ago and said that one lady just put 87 in all the time and had to change a lot of part on the FX. These cars require 91plus. octane. Why buy these cars if you can't afford it? Should have bought a Honda or corolla for your DD
#11
Registered User
iTrader: (10)
Thread
Thread Starter
Forum
Replies
Last Post
Hogbone
Engine, Drivetrain & Forced-Induction
2
09-28-2015 06:44 PM