A valve float means that these poppet valves stop closing. Poppet Valves are a part of an IC engine and their job is to moderate fuel and exhaust intake and outtake. One of the worst things that could happen to an engine, valve float usually happens at really high speeds. This causes diesel engines to have a low overall RPM and thus they get lower engine redline RPM as well. Diesel engines need to combust with the pressure alone and don’t use a spark plug which makes them slower compared to a petrol engine. They are slow to combust than petrol and are mainly focused on more torque rather than RPM. This is because diesel engines are not made for high RPM in the first place. Petrol engines usually redline at 7000-8000 RPM while diesel hits the peak at around 4500 RPM. Type Of Fuelĭue to how engines are made for diesel and petrol, petrol gets higher redline RPM compared to diesel. Weaker components used will limit the redline RPM as the engine will not be able to sustain loads at high RPMs or even reach those RPMs. This one is a no brainer as stronger and sturdier components allows for an increase in redline. These include but are not limited to the physical capacity of the components, type of fuel used and the biggest of them all the how long it takes till the valve floats. There are a lot of variables when deciding an engine redline. This means that redlines are at a level that one won’t reach them while driving normally thus making it easier for casual drivers as they don’t have to worry about accidentally reaching peak performance. Redlines are developed in such a way that operating at them will not harm the engine and they are at a level which will not be reached without trying to redline. It is the maximum engine speed you can achieve that will not harm the car. The term redline is said to come from the fact that you are reaching the red lines on a tachometer (RPM counter), hence the name. Popular Read: How a Cheap Used Car can be a Trap | Buyers Beware! Engine Redlining Redline on tachometer Let’s take a look at what redlining is in terms of cars and is it safe to do it? You might have heard redline in context to the car or something else but in all cases, it means the same thing which is reaching the peak of something.
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