Quote:
Originally Posted by oldman
LT4 Cam Specs
Part Number 12642245
Duration @ .050 in. (int./exh.) 189°/223°
Valve Lift (int./exh.) 0.492 in./0.551 in.
Lobe Separation Angle 120°
tiny in fact.
L86 Camshaft Specs
Part Number 12629512
Duration @ .050 in. (int./exh.) 200°/207°
Valve Lift (int./exh.) 0.551 in./0.524 in.
Lobe Separation Angle 116.5°
LT1 Cam Specs
Part Number 12629512
Duration @ .050 in. (int./exh.) 200°/207°
Valve Lift (int./exh.) 0.551 in./0.524 in.
Lobe Separation Angle 116.5°
LT2
Revised Cam Profile And Phasing
Now that the exhaust flows about as freely as the intake, the exhaust valve lift is increased by 1mm to match the intake's 14.0-mm lift, which improves exhaust valve flow rate from 122 to 125 grams/second. Duration is also increased, and the range of authority of the cam phasing is now 62 degrees (though the controller seldom orders more than 50 degrees).
It would be my opinion that power is related to intake duration and lift.
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Excellent data here.
So the L86 and LT1 share the same stock Cam...
I wonder why the LT4 cam exhibits a smaller intake lift
What are the advantages of this Cam spec in an FI setup? Vs. the LT1/L86?