Spark ignition gasoline and compression ignition diesel engines differ in how they supply and ignite the fuel. In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion.
1 If your skin is too sensitive, dilute tea tree oil with some baby shampoo. Add 10-20 drops of tea tree oil to 1/2 cup of baby shampoo. Use this daily to wash your scalp and hair till you get rid of itchy scalp.  You can even massage diluted tea tree oil to your scalp.
Many conditions can cause an itchy scalp â from dandruff to ringworm or something more serious like a bacterial infection or autoimmune condition. Before you can stop the itch, you need to find out whatâs causing it. Here are five common causes and treatments for itchy scalp: 1. Dandruff and seborrheic dermatitis. These are the most common reasons for an itchy scalp. âYour bodyâs inflammatory response to an overgrowth of yeast causes the itching and flaking associated with these conditions.