I'm just curious how all these affect the powerband

like adding more lift where would that give more power or is it all over, would it hurt some places. what woudl more lift do for gas mileage?

what about the others like lobe seperation angle or intake/ exhuast centerline what would they do for the powerband



I'm curious how all these would affect the powerband on a car and what they would do for gas mileage also?


like if I wanted to make a cam to get me great gas mileage what would I want to do
what about one for good peak hosepower or maybe low end grunt or if I want a good mid range?

 

Your gonna need a book, or atleast somebody one here to write on for you. I'm sure not right now.

http://www.aptfast.com/APT_Parts/Boo.../B-05_info.htm

 

lol I have no money for a book


but moer concerned about a gas mileage build right now
trying to get good gas mileage in th 1500-3300rpms range

but curious as far as other aspects as well being friend and I might be working on a 350 soon enough

 

Duration is not good for gas mileage, but make more power because the engine will rev higher and the valves are open longer. LSA effects the power band, a narrow LSA makes a peaky, a wider LSA makes for a flatter torque curve and a much less peaky engine. LSA also effect the amount of valve overlap, wider has less narrow has more. Lift is good but is hard on the valvetrain. It is worthless to increase lift if the head flow can not take advantage of it.

So for gas mileage as wide LSA(114) short duration(210) cam with about .500" lift will be good.

 

don't some heads work a little different with the lsa as well?

and whats the intake and exhuast center line for?

 

another question is how does timing the cam have to do with power production and gas mileage?

 

These are great questions and I'd love to get the "quick fill in" on all these questions as well... Thanks for asking them RX7speed

 

This article at chevy high performance might help:
http://www.chevyhiperformance.com/techarticles/95298/

I could write up something for you but it wouldn't be as thorough or accurate as an article someone spent time writing like this.

When I think of a cam that makes good power and gives good gas mileage, I think of performance production cams like that in the LT4 or LS1. The powerband depends a whole lot on the cam, but intake, exhaust, and heads are important as well.

This article doesn't really go into lift (as far as I read), but as for adding power, adding more lift will only help if you can flow more air at that higher lift. Sometimes more lift will do nothing but stress your parts, especially with stock heads where flow doesn't increase very proportionally with lift.