Get checked out: Blood in the phlegm can have a lot of causes: some benign, others not as much. Especially if you are a smoker, any blood in the phlegm is not normal. The best thing is to see your doctor: get the blood in the phlegm and the pain in the kidneys checked out.
Four Cylinder Engines. The four cylinder engine is just like the three cylinder engine only it has the additional cylinder and therefore weighs more. As is true of any engine, more cylinders equal more power and smoother sailing. It is important to consider how much size and power you require in your motorcycle.
All About Cylinder Heads and How They Work. Your cylinder head or heads are located, as you might expect, at the top of your engine. Inline or straight engines have one cylinder head, while V-shaped engines and boxer engines have two, one for each bank of cylinders.