Elliot_Richards
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- Jan 5, 2012
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Can the inlet cam be fine tuning to increase performance?
Getting the best out your vct
- Thread starter Elliot_Richards
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luke
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nope
PumaNoob
New member
Well it can be fine tuned if you change the profile of it, but with the standard cam profile, it's already set with just the right amount of overlap and to open the valves at the right time. If you advanced it, you will make the inlet valve close a little to early, before the piston has reached the bottom of its stroke, so you have not utilised the full cylinder capacity, and will get less volumetric efficiency. If you retard it, you run the risk of leaving the inlet valves open a little too long, and the piston will start to push the air back out the inlet before the valves close, again not making use of the full volume of the cylinder.
The VCT makes best use of the cam, because retarded inlet makes for best power low dawn, advanced makes for best power high up. Normally you could advance the inlet cam a degree or 2 to get more power higher up in the rev range, at the expense of low down power, but the VCT gives you the best of both worlds. If you changed the cam profile, then it might be worth trying different settings, or if you went for forced induction.
The VCT makes best use of the cam, because retarded inlet makes for best power low dawn, advanced makes for best power high up. Normally you could advance the inlet cam a degree or 2 to get more power higher up in the rev range, at the expense of low down power, but the VCT gives you the best of both worlds. If you changed the cam profile, then it might be worth trying different settings, or if you went for forced induction.
