Calculating valve overlap?
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TECH Regular
Joined: Jun 2004
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From: Bakersfield, CA
Calculating valve overlap? okay ive been researching this but cant really find a definate answer.
ive got all the specs i need on the cam card.
okay, lots of guys talk about a cams overlap using durations at .050, instead of the cam duration at initial opening and closing points. ive read that you need to have that info do accurately figure overlap.
lemme know what your guys formulas are...
my cam duration at .006" is 271/280 on a 112lsa ( lobe center lines are 109int and 115exh)
thanks,
Jeremy
ive got all the specs i need on the cam card.
okay, lots of guys talk about a cams overlap using durations at .050, instead of the cam duration at initial opening and closing points. ive read that you need to have that info do accurately figure overlap.
lemme know what your guys formulas are...
my cam duration at .006" is 271/280 on a 112lsa ( lobe center lines are 109int and 115exh)
thanks,
Jeremy
Overlap at .006" is calculated the same as at .050" and .200"....just use the durations and LSA at that lift.
(Intake Duration + Exhaust Duration)/2 - (LSA*2)
(Intake Duration + Exhaust Duration)/2 - (LSA*2)
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Teching In
Joined: Sep 2008
Posts: 11
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My 228R on a 112 LSA has 4* overlap @ .050 and 53* @ .006.
When talking overlap of a cam i assume its the 53* that would be mentioned?
Cheers Mike.
More often than not, when people refer to overlap on the forums they are speaking of the .050" numbers.
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COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
