i understand that the g35 coupe is best maintained when it is run on 91 plus fuel. however, after further research, i read give or take a few the engine 'knock' that happens when you give the motor 87 octane gas. is it possible to use 87 and not get the engine knocking? how do you fix it? is at hand anything else that could be the problem?
the knock sounds like a constant tap coming from your engine when you turn on the coup¨¦. if you open the hood, u can hear it louder.
Using 87 for a 91 car should not be a problem if the car is computer controlled. The solely thing that will happen is that you will lose nearly 10% horsepower. If you do not drive your car hard, it should not be a problem.
Answers: The engine 'knock' caused by low octane fuel is not a constant crash. It occurs only below hard acceleration and goes away.
It is not simple to explain completely what cause this noise, (which is the skirt of the piston slapping against the cylinder wall) but it happens when the fuel mixture ignite from the heat of compression before the spark plug fires. Thus, the given name 'pre-ignition'. Again, it only occurs underneath hard acceleration.
What you are hearing is something else. Maybe the valve need adjustment and you are hearing a stopcock tap. There are many possibilities.
If you want the complete explanation of a piston knock, read on. The connecting rod is not attached to the piston contained by the exact center of the piston itself, it is offset to one side by a very small amount. This cause the piston to be pushed up into the cylinder with one side gliding smoothly along the cylinder wall instead of rocking to one side and binding slightly.
The pattern of the explosion cause by the spark plug keeps this balance and the piston continues to skim smoothly. However, when pre-ignition occurs from the mixture igniting too precipitate, the piston rocks to one side and the skirt slaps against the cylinder wall causing a ping noise. Knock detectors are mounted close to the cylinder wall and detect this distinctive tremor.
High-octane gasoline has additives that slow the combustion rate. The higher the octane rating, the smaller quantity likely the mixture is to ignite from compression. So high compression engines require glorious octane fuel to prevent this pre-ignition and to run best. I doubt that 91 octane is required. Usually 89 octane is considered high-octane.
Using 87 for a 91 car should not be a problem if the car is computer controlled. The solely thing that will happen is that you will lose nearly 10% horsepower. If you do not drive your car hard, it should not be a problem.
the knock sounds like a constant tap coming from your engine when you turn on the coup¨¦. if you open the hood, u can hear it louder.
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Using 87 for a 91 car should not be a problem if the car is computer controlled. The solely thing that will happen is that you will lose nearly 10% horsepower. If you do not drive your car hard, it should not be a problem.
Answers: The engine 'knock' caused by low octane fuel is not a constant crash. It occurs only below hard acceleration and goes away.
It is not simple to explain completely what cause this noise, (which is the skirt of the piston slapping against the cylinder wall) but it happens when the fuel mixture ignite from the heat of compression before the spark plug fires. Thus, the given name 'pre-ignition'. Again, it only occurs underneath hard acceleration.
What you are hearing is something else. Maybe the valve need adjustment and you are hearing a stopcock tap. There are many possibilities.
If you want the complete explanation of a piston knock, read on. The connecting rod is not attached to the piston contained by the exact center of the piston itself, it is offset to one side by a very small amount. This cause the piston to be pushed up into the cylinder with one side gliding smoothly along the cylinder wall instead of rocking to one side and binding slightly.
The pattern of the explosion cause by the spark plug keeps this balance and the piston continues to skim smoothly. However, when pre-ignition occurs from the mixture igniting too precipitate, the piston rocks to one side and the skirt slaps against the cylinder wall causing a ping noise. Knock detectors are mounted close to the cylinder wall and detect this distinctive tremor.
High-octane gasoline has additives that slow the combustion rate. The higher the octane rating, the smaller quantity likely the mixture is to ignite from compression. So high compression engines require glorious octane fuel to prevent this pre-ignition and to run best. I doubt that 91 octane is required. Usually 89 octane is considered high-octane.
Using 87 for a 91 car should not be a problem if the car is computer controlled. The solely thing that will happen is that you will lose nearly 10% horsepower. If you do not drive your car hard, it should not be a problem.
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