I am needing some help on cam selection. From what I am understanding if it is correct, much better with a 114or 115 lobe seperation as apposed to a 112? Is this for safety reasons or just for more power gains so it's not bleeding boost out the exhaust? With that being said would a 112 possibly help prolong a engine with less cylinder pressure while sacrificing a little boost?? Thanks for any help guys, its a LT1 car but I would assume same theory applies to anything on this subject.

Thanks in advance.

 

I also thought I needed a 114 lsa, but the custom cam that I got from Advanced Inductions is a 110 lsa. They picked it and I have been very happy with it. I think they told me if your not running real high boost The lower lsa works fine.

 

Thank you, I am getting ready to install a Vortech and have been in a huge debate with myself if this thing, and how long it will last with a vortech on it. thanks

any other input would be appreciated tho.

 

I see your from Lafollette, I am from Kingsport. I also am on Highperformancetoys.com (Green Ta). I love that color blue on your car. As far as the cam you might want to check with Advanced Induction, just to see what they recommend or some of the other guys on here. I am just going on what I have. Like I said earlier it seems to work pretty well. I am also on borrowed time with a stock short block. I have put almost 10,000 miles on it since the vortech so I am keeping my fingers crossed.

 

Thats some good #'s you put down!!!! Thanks for teh props on teh car, yours is slick as well. need to get them together one day.

 

With a steet driven blower car, you typically see cam setups that have 0-5 degrees overlap @ .050. Based on desired rpm range, whether or not you need to pass emissions or not, etc. Here is an example of how you can quickly calculate overlap and see how different LSA's affect it.

224/236 114 cam:

224 + 236 = 460
460/4 = 115
115 - 114 = 1
1 x 2 = 2 degrees overlap

In order to get the same amount of overlap out of a smaller cam, the LSA can be less:

218/230 111LSA

218+230 = 448
448 / 4 = 112
112 - 111= 1
1 x 2 = 2 degrees overlap

As you can see, inorder to achieve the same overlap between the 2 cams, the LSA's are significantly different. This shows that you shouldnt just pick a standard LSA number, and that some calculations are needed. This is just an example of some simplified math.

 

my cam is on a 112 lsa, i was told its better for running high rpms for extended durations because the boost being bled off will help cool the pistons, similar to an offshore boating cam

 

Thank you guys, in sorting all that out it has helped.

 

Couple of things:

Forget about LSA and worry about overlap. My experience has been that you should keep overlap under 0 deg at .050" for supercharged.

Forget about overlap if you're only running 6 psi boost or less. That's not enough boost to change the operating parameters of the engine enough to need "special" cam spec's.

 

Thats what my point was too, maybe not as blunt Definitely target a certain amount of overlap and pick your durations and then you'll see what the overlap needs to be.