Engine blow-by is the compression of air and fuel inside the combustion chamber of the cylinder, which passes over the rings of pistons to the crankcase ventilation generally because of damaged piston rings and pistons or a damaged wall of the cylinder. Internal combustion engines function by the combustion of fuel and air. If this spark gets into the crankcase via piston rings, and then away from the engine it is a blow-by. If your pistons are leaky and are causing the blow-by, you could also experience the loss of horsepower. If it isn’t addressed the issue, blow-by can cause more engine problems and increase oil consumption.

Silky Terrier Dog Breed Playing Aro... Silky Terrier Dog Breed Playing Around

The most frequent causes of blow-by include worn-out piston rings or damaged walls of the cylinder. In certain instances it is possible to be mistakenly thinking that blocked ventilation in the crankcase is blow-by. Therefore, it’s a good idea that you check for blocked crankcase ventilation prior to determining blow-by. There are several factors that can cause blow-by. In general, blow-by is an issue that is difficult or expensive to repair. If, however, you notice a blow-by happening, you’ll need to examine the breathing of your crankcase to ensure that it’s not blocked before you do so.

A blow-by could damage your engine. You may not feel the damage at first, but you will notice them over time. When the blow-by has caused its damage, you could observe that the blow-by may overflow your intake with gasoline and oil, decreasing the efficiency of your engine. The blow-by may also expand in the crankcase and settle in your head and cylinders and head, which can lower the octane level of the gasoline you use. There may be a sound inside your engine. 

This could be a sign of pre-ignition. Pre-ignition happens when your mixture of fuel and air ignites in a hurry and without intention. The octane amount the manufacturer suggests is the correct level to avoid pre-ignition. However, it’s not the case when more fuel gets in the combustion chambers. The result for an engine is very damaging and, with time, blow-by could cause damage to your spark plugs. The spark plug that is coated with oil can fail to fire and could cause carbon accumulation. This is a very hazardous situation that has to be dealt with immediately.