I have this cam and I want to know how good it will perform with the blower. It's nice and fat on the exhaust side but usually blower cams are ground on larger lsa's right? What about the intake? I'm new to this head/cam game but I'm getting there.

 

It's impossible to be specific without more details about your combo, but in general this is not an opitmal blower cam. It has too much overlap.

Rich Krause

 

Rich,

I've read a lot of your posts and respect your opinion, but I have to disagree with one point you make. Although LSA is an indicator of overlap, it is not the tool in which to determine what overlap is. What we need to know are the actual valve timing events in which LSA is computed. Without going into specifics, I can state that my custom ground Crane cam has a 112 LSA, but it has zero overlap. In fact, my intake valve closes two degrees before the exhaust opens. This makes my cam a good piece for a blown application, even though it has a 112 LSA.

 

You are right, of course. But I doubt that's the case with the cam referred to in the original post. I probably should have said that "there's not enough information to say". IU'm curious about your cam though, First, you referring to "overlap at 0.050", right? What is the duration (advertised and at 0.050") and what is the intake center line?. My new 224/236 cam needed a 115 deg lsa to achieve my desired zero overlap at 0.050". Yours must have a very small duration.

To achieve zero overlap at 0.050" using typical lobe profiles with 218/234 needs ~113 degree LSA. So maybe it's not to far off as I originally thought (I didn't work it through) but it is still a bit more overlap than I like to see.

Of course, there's more to cam selection than overlap.

Rich Krause

 

Rich,

I would be glad to share my cam specs with you, but because it is not the topic of discussion here, please e-mail me and I'll send you a pic of my cam card.

Willie

 

I'll do it at home later, I'm at work.

Rich Krause

 

I think that you make a very good point. Different set-ups/combos dictate different valve events (opening/closing). The duration of a cam is just one variable in the "gumbo" of timing events and cam selection. "Degree-ing" the cam can also effect timing events. You bring up a good point in cam selection for specific application...