Lunati 30142
http://www.lunatipower.com/Product.aspx?id=1833

I tried a couple online calculators and came up with varying results. Not sure at this point what is the right or wrong answer. Help please.

APPROXIMATE adv overlap "operational" reference chart:
10* - 40*….towing
30* - 60*….ordinary street
50* - 75*….street performance
70* - 90*….street/strip
85* - 100*...race
95* - 115*...Pro race



http://www.wallaceracing.com/overlap-calc.php
Use Advertised Duration Numbers and the Lobe Separation Angle
Intake Duration : (in degrees)
Exhaust Duration : (in degrees)
LSA : (in degrees)
Your cam has an Overlap of 66.00 Degrees


http://www.rbracing-rsr.com/camshaft.html
Camshaft Lobe Center / Duration Calculator
Camshaft Name / Number :
Intake Opens BTDC (ATDC is -) : (in degrees)
Intake Closes ABDC : (in degrees)
Exhaust Opens BBDC : (in degrees)
Exhaust Closes ATDC (BTDC is -) : (in degrees)
Camshaft Calculations - Lobe Center / Duration
Your 30142 has an Overlap of 16.00 degrees and has in Intake Duration of 235.00 degrees. The Exhaust Duration is 245.00 degrees. The Inlet Cam has an Installed Centerline of 108.00 degrees ATDC. The exhaust cam has an Installed Centerline of 116.00 degrees BTDC.



Here's the CORRECT way to calculate your cam's ADVERTISED OVERLAP which will be needed for the chart below:
• Add your intake and exhaust advertised duration (duration at .050 will NOT give you the correct overlap)
• Divide that answer by 4
• Subtract the lobe separation angle (LSA) from that answer
• Multiply that answer by 2, and you have the CORRECT adv overlap to use below
My personal math comes out at 16 deg. overlap




Two of the 3 methods have similar answers but don't fit well into the description of a good street cam. The oddball answer of 66 deg. seems to fall in line with a performance cam. I'm guessing that the 16 deg. would make for excellent vaccum and more available torque at lower RPM's? Also easier tunabilty?

 

The advertised duration numbers of 235/245 are a dead give away as to it's usage; Hi perf street or strip in a 350.

Also look at Lunati recommendations ;
big stall convertor and low gears .Good for bracket race car. .... mid to upper RPM.
Operating RPM Range of 3200-6500 is obviously not a bottom end torque cam

 

Thanks Vette,

Might it be accurate for me to say that you are inferring the 66 deg. is the correct answer then? Any idea where the 16 deg answers come from?

 

The correct answer seems to be 66.
I got 285 + 295= 580. Divide by four equals 145. Subtract lsa of 112 equals 33. Times 2 equals 66.
Did I read something wrong or do it wrong?

I will however agree with vetteoz in his breakdown of this cam.