Determining valve event when knowing duration LSA?

[The Horvaths]

It can get down to the little things, like using a lower ratio rocker arm on exhaust valves to get better low-end torque. Oh, the games we play.

 

[MarPar]

Thanks for the replies!! I'm no cam guru for sure but do understand some of the aspects of how they work. A lot of people post about what cam to use and see them posting lift and duration numbers but never valve events. I know that can change when advancing or retarding but if the cam valve events is stated according to recommended installation on the cam card, a good idea of how an engine will run can be derived based on valve events, right? Of course the engine needs to be built accordingly for a particular grind but it looks to me like if you know just the valve event timing, then all the other numbers can be figured out? One of the first things I look at is when the intake opens and closes and that generally tells me if I want to look further into that particular cam or not.....

great thread, Cranky! valvetrains and how they work is becoming clearer and clearer to me!

Yep! I'm no guru either

look at you being all modest and $hit lol

It can get down to the little things, like using a lower ratio rocker arm on exhaust valves to get better low-end torque. Oh, the games we play.

that's the beauty of the toys we have!!

 

[Mebsuta]

Can valve events be determined when you only know what the lift, duration and LSA is?

I think you need to know the intake lobe centerline, then you can use this calculator. It might be best to use duration @ .050, because advertised duration is measured differently between a lot of companies that grind camshafts.

http://www.wallaceracing.com/cam-deg-calc.php

 

[dvw]

Can valve events be determined when you only know what the lift, duration and LSA is?

Absolutely give me your known specs