Adjustable CAM GEARS - the basics you need to know

Here's a link to my adjustable cam gears (cam pulleys): https://technotoytuning.com/toyota/16...

Here's a video on how to use adjustable cam gears. If you install aggressive camshafts on your engine, adjustable cam gears become a must, otherwise the stock cam gears will be limiting the potential of your aggressive cams.

Adjusting adjustable cam gears or pulleys is super easy. Unlike stock cam gears which require the removal od a timing belt and valve cover to be "adjusted", all you need to to do adjust aftermarket cam gears is to loosen a few bolts and rotate the engine.

Cam timing is the position of your camshaft lobes in relation to your piston's position. Advancing cam timing on the intake cam means the intake valves will open earlier. Retarding cam timing on the intake cam makes it retarded *crickets sound*. Retarding cam timing on the intake cam actually makes the intake valve open later. However, since the 4a-ge engine is a dohc (double over head cam) design we can also play with the lobe separation angle.

You adjust the lobe separation angle by moving the cam lobes away from each other or towards each other.

Moving cam away from each other, i.e. increasing LSA results in:
Broader power band
Lower max HP
torque moved lower in the rpm range
maximum torque decreased
engine idles better
less chance of engine knock
piston to valve clearance increased

Moving cam towards each other, i.e. decreasing LSA results in:
Narrow power band
Higher max HP
torque moved higher in the rpm range
maximum torque increased
engine idles worse
more chance of engine knock
piston to valve clearance decreased

It might also be important to add that playing with the LSA has almost the opposite effects on a turbo vs. an naturally aspirated engine.

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