DOHC. Obviously a v-6 or v-8. DOHC- Double OverHead Camshafts. 2 camshafts per cylinder head.
It could have one, two or four cams. Depends on the engine
DOHC
The "bumps" you refer to are called the "lobes". They are a precise size that allows the valves to open and close correctly in an engine.
DOHC stands for Dual Over Head Cam : That means that each cylinder head has 2 camshafts on the top of the engine cylinder head ( in the case of the Ford Escort ZX2 , there is one cylinder head on the four cylinder engine so it has 2 camshafts on top of the cylinder head )
In a 1999 Ford Contour : The 2.0 litre four cylinder engine has ( 2 cam shafts on top of the cylinder head ) The 2.5 litre V6 engine has ( 2 camshafts on top of each cylinder head so there are 4 camshafts )
the wankle engine has no camshaft
A single overhead camshaft V-8 has 2 camshafts, one on each head.
Cam lobes
To determine the correct orientation of the camshafts in a 1992 4sfe engine, consult the engine's service manual or a reputable automotive repair resource specific to your vehicle model. Additionally, markings or notches on the camshafts and engine block can indicate their proper alignment. It is vital to follow the manufacturer's guidelines and specifications to ensure correct installation.
Real simple exhaust camshafts are the camshafts nearest the exhaust manifolds ( outside if cylinder heads) intake camshafts are on the inside closer to center of engine.
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Dohc means that the engine has 4 valves per cylinder or 2 camshafts per head :)