On this episode of PowerNation Extra, the Engine Power guys tell you all about lobe separation and what it means. Lobe separation is the amount of degress between the intake lobe centerline and the exhaust lobe centerline. It’s also the only measurement on the cam card that’s measured in camshaft degrees, not crankshaft degress.
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Engine volume controller = lobe sep
LSA doesn't determine overlap. Overlap determines overlap.
You can have a cam on 112° LSA and 60° of overlap, and you can have a 106° LSA with 60° overlap.
The LSA determines if the engine will make maximum output, and overlap determines where in the power curve output will peak.
Duration and lift are byproducts of choosing LSA and overlap. So many get this wrong.
,,,,,,,,,,,,,,,,,,,,Thanks guys…………..I've seen cam lobe diagrams similar to those since I was a teenager ……and they looked confusing….You have two there , and that takes out any mysteries the eye might detect,,,,,,,,,FURTHERmore , you marked the area in RED and ,,,,Thanks again……………Bravo,,,,,,,,,,,,All that info in under 3 minutes…………….
No info
I am looking for cam for a 1969 Cougar eliminator 428 scj. I need good vacuum for power braked and head light doors. Any help?
Well hellloooo beard
What's the best LSA for best torque?
hey got a question for you ..do a elgin e-1090p cam have a nice chock sound to it.
I just don't understand, if there's no overlap, how are you going to scavenge exhaust gases?
So the less lobe separation the more chop ?
Every time someone talks about lobe separation angle, they cant help but talk about overlap. And its true, it does increase, but the tighter it is , the better it is for the most important of the four opening and closing points of the cam. The tighter the LSA, the sooner the intake valve closes, making more cyl. pressure. Also There is a difference between more duration at .050 overlap and overlap created by a tight lsa.
I remember Hot Rod Magazine did a blower motor build where they used a Comp Cams with a 110 degree LSA…..Why Why Why would you do something like that? Blower motors need a higher LSA like in the 113 -116 range. Hot Rod Magazine even has a test, with results shown online, that boosted engines need that wider LSA (see Hot Rod Magazine Camshaft Shootout: Lobe-Separation Angle Tested and Explained
Notice: This is not a comment about Blower cams, nor their lift and duration…. It is a comment about LSA and it's scavenging effect @ on NA motors compared to SC motors. Both valves open at the same time on a SC motor creates a boost leak, and you don't want that. But at the same time, Higher LSA does not make a cam a "Blower Cam." Comp Camps sells camshafts for NA Coyote engines that have up to 130 LSA
Need more info ls3 no boost application.
What would give better low end turque lsa low or high?
You can increase the duration by flattening the top of the Loeb there for the valve stays open for a longer duration
When I was about 21 I built a big block for my 1970 Chevelle. I installed a Crower solid lift with radical lift and 105 degree lobe separation. Piss poor vacuum and very lopey idle. It hauled down the track and pulled like a freight train from 3500-6500 rpm. After having a family nice Sunday drives were a pain because of the way it ran. So it got mothballed until recently when my 20 year old pulled it out because of the stories everyone told about it. Well, it’s like starting over. So many years in storage has taken its toll.
Said a whole lot and didn't answer anything
I wanna kick his azz. That mustang loving Bearded Goat.
What Powerblock didn't dicuss you look for wider overlap cams 112 to 114 for engines that have large valves like a chevy 350, and a low overlap cam 110 to 108 LCAfor a 305 chevy or a 400 where the valve aren't large enough.
What is icl
https://www.youtube.com/watch?v=B0LN_emIdUc&t=2s