Is the camshaft part of the engine block?
Most early internal combustion engines used a cam-in-block layout (such as overhead valves), where the camshaft is located within the engine block near the bottom of the engine. For OHC and DOHC engines, the camshaft operates the valve directly or via a short rocker arm.
Where can I find the camshaft number on a Chevy?
Many camshaft number reference sites exist online for V8 engines, but determining the camshaft specs for six- and four-cylinder engines may require contacting a Chevrolet parts department. Remove the camshaft from the engine if necessary. This is an involved process, requiring the removal of the engine’s front end.
What do you need to remove a Chevy Cam?
Remove the camshaft from the engine if necessary. This is an involved process, requiring the removal of the engine’s front end. The radiator, hoses, timing assembly, belts and fan will need to be removed to access the camshaft. This is a job for professionals and the mechanically-inclined.
Can you rotate the cam shaft on an OHC engine?
Rotating the camshaft on an OHC engine is easy to do when your pulling the head. And even just changing the chain. If the crankshaft is turned to put the timing mark 90* before top dead center, all 4 pistons will be half way down their bores and you can spin the camshaft with no chance of a piston/valve collision.
Can a crankshaft be turned to spin the cam shaft?
If the crankshaft is turned to put the timing mark 90* before top dead center, all 4 pistons will be half way down their bores and you can spin the camshaft with no chance of a piston/valve collision. You need a good manual.
How does a camshaft work in an engine?
Turning at half the speed of the engine’s crankshaft, the camshaft has a lobe for each valve that pushes up on each valve lifter in a particular sequence. The valve lifters, through the push rod and rocker assembly, open each valve in turn to either let intake gasses in or exhaust gases out.
How is the cam lift of a car determined?
This can be calculated by multiplying the cam lift by the rocker ratio. Duration: This is the amount of time the camshaft lobe holds the valve off its seat, and it’s an indicator of how the power curve will be shaped over the rpm range.
Why does a performance Cam lose torque at low rpm?
An engine with a performance cam operating at low RPM will suffer a loss of torque due to the fact that the effective compression ratio is reduced by the late intake valve closing point. However, as the RPM increases “inertia supercharging” becomes important.
What should the duration of a camshaft be?
Duration: This is the amount of time the camshaft lobe holds the valve off its seat, and it’s an indicator of how the power curve will be shaped over the rpm range. Shorter-duration cams are good for low-speed power, while longer-duration cams function more effectively in higher rpm ranges.