Which LSA for a....
10-17-2007, 06:25 PM
#22
Not as much as an NA, not at little as a FI. A Nitrous cam tends to be on a slightly wider LSA than it's NA couterpart, with more exhaust duration. Not by rule, by trend. I'm generalizing. Nitrous burns faster, and to clear the larger volume of exhaust, you need to open the exhaust valve earlier. This is going to give up some low end torque.. but with nitrous, you'll get it all back and then some. What people need to decide is the balance between ON nitrous and OFF nitrous.. and what cam will be more enjoyable the majority of the time.
10-17-2007, 07:13 PM
#23
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Not as much as an NA, not at little as a FI. A Nitrous cam tends to be on a slightly wider LSA than it's NA couterpart, with more exhaust duration. Not by rule, by trend. I'm generalizing. Nitrous burns faster, and to clear the larger volume of exhaust, you need to open the exhaust valve earlier. This is going to give up some low end torque.. but with nitrous, you'll get it all back and then some. What people need to decide is the balance between ON nitrous and OFF nitrous.. and what cam will be more enjoyable the majority of the time.
1. an all out nitrous cam
2. a street/strip nitrous cam...
I have an MS3 237/242 .603/.609 113LSA.... How does that stack up for a nitrous cam on an L92/L76 408CI????
Sorry for all the questions, just trying to learn as well as help others....
thanks
10-17-2007, 07:50 PM
#24
ooooooooooohh boy..
well, to begin with, the L92 head wants a cam very different than an LS1 cathedral port head. The runner size on an L92 is pretty big, and air velocity suffers a bit, but you get good CFM numbers. The exhaust side on the L92 has a VERY weak ratio (vs intake flow) compared to a ported cathedral head, so it's going to need 1 of 3 things anyway. 1) more exhaust duration, 2) an earlier exhaust valve opening, or 3) a combination of 1 and 2. Nitrous is just going to exhagerate that. The intake side wants an earlier intake valve opening as well since velocity will be down, but with nitrous, the intake side is less sensitive since you're injecting the air. (I'd also run as free a flowing exhaust as I could with L92's, and as big a primary as possible.)
I wouldn't run the MS3 as a nitrous cam in a L92 headed 408. I'd lean towards something more along the lines of a 240/252 114+4.
There's lots of offerings out there for standard LS1 nitrous cams.. I'd love to come up with a couple, and maybe I will tomorrow. But I'm too sick tonight and need sleep before a long day at work tomorrow.
well, to begin with, the L92 head wants a cam very different than an LS1 cathedral port head. The runner size on an L92 is pretty big, and air velocity suffers a bit, but you get good CFM numbers. The exhaust side on the L92 has a VERY weak ratio (vs intake flow) compared to a ported cathedral head, so it's going to need 1 of 3 things anyway. 1) more exhaust duration, 2) an earlier exhaust valve opening, or 3) a combination of 1 and 2. Nitrous is just going to exhagerate that. The intake side wants an earlier intake valve opening as well since velocity will be down, but with nitrous, the intake side is less sensitive since you're injecting the air. (I'd also run as free a flowing exhaust as I could with L92's, and as big a primary as possible.)
I wouldn't run the MS3 as a nitrous cam in a L92 headed 408. I'd lean towards something more along the lines of a 240/252 114+4.
There's lots of offerings out there for standard LS1 nitrous cams.. I'd love to come up with a couple, and maybe I will tomorrow. But I'm too sick tonight and need sleep before a long day at work tomorrow.
10-17-2007, 08:02 PM
#25
TECH Senior Member
WHAT HE SAID\
Im general though unless this is a 150 + shot Nitrous, choose your cam for best NA performance and just shoot it. Big shots then start favoring for the task at hand.
Im general though unless this is a 150 + shot Nitrous, choose your cam for best NA performance and just shoot it. Big shots then start favoring for the task at hand.
10-17-2007, 10:34 PM
#27
You'd loose a bit down low but that cam would make great power across the entire rpm range. Keep in min supporting mods too including gears, etc. This is about as big as a cam I'd go with for a 346 street drivin car but not everyone has the same goals in mind. This would be a great cam but I'd personally run it on a tighter LSA, atleast 112 and maybe 111
