Lumpy

Does a lower lsa number mean more power? If not, which numbers in a cams' specs means it will make more power?

Colonel

Man, LSA (and cams specs in general) has been talked about ALOT here lately. Do a search for it and see what you come up with.

deviate42

iTrader: (2)

Lobe separtion.

tony did a big post on it if you do a search.

it basically adjusting the powerband of a cam. The idle is also different. Higher LSA generally means the cam makes power higher in the powerband. Lower LSA=lower

Z-Rated

And how it lopes, 112 sounds cool

50ETR

The lower the number of LSA the more lope you will you have! 111 and 112 sounds much less stock than the 114LSA's....

nuzee

iTrader: (2)

Not! Replace "LSA" with "duration" to make that a correct statement.

LSA will affect the shape of the torque curve.

deviate42

iTrader: (2)

?

off JMX's sight:

LSA (Lobe Separation Angle):
Lobe Separation Angle, usually referred to as "LSA", is the angle of separation between the exhaust peak and intake peak. The lower the angle, the more the lobes will overlap, and that means more lope, gas smell, and drivability issues...however, the lower LSA can also mean more power and you get it sooner in the RPM range to boot. Duration and LSA are 2 very important items in clueing you into how a cam will idle and drive, although there is a LOT more to a cam than this.

off ls1camaro.net :

LSA is the angle between the intake and exhaust lobes. This determines the time between when the intake valve closes and the exhaust opens. Too small and you get overlap, where they are both open at the same time and you can get fresh air and exhaust mixing (that's bad). Duration and LSA coupled together cause this. Lower LSA typically moves your power down a tad in the RPM range, higher moves it up.


hope that helps



and yes duration affects the powerband as well...

nuzee

iTrader: (2)

I edited that post to remove my emotional response, LOL.

Anyway, back to your post, a tight LSA on a relatively low duration cam can give you a very punchy off-idle throttle reponse. But if you add more duration while keeping the same LSA, your punchiness will move up higher in the rpm range. You'd have lower power until you reached the rpm range where the cam "comes on".

So to say a tight LSA cam will give you better low end is not true. It is more correct to say in general, the lower the duration the better the lowend.

I believe some "old school" literature is still available that can explain this whole thing much more clearly than I can (or am willing too).

Lumpy

Every time I search I can never find exactly what I'm looking for.

So, for a strict street car, say a 427 N/A stroker, A4, what would be the biggest cam to go with without getting drivability issues?

Currently, I have a 242/242 .610/.610 114 lsa, so how much bigger can a cam be and still idle nicely?

nuzee

iTrader: (2)

Jaime33
This site explains duration:
http://www.hughesengines.com/www/hug.../choosecam.asp
It does not go into LSA. I'm looking for a site that clearly explains LSA. David Vizard wrote a book about camshaft theory which explains things better than I ever can.

Lumpy,
I'm sorry I steered your thread away from your questions. That was not my intent.

SSactionLs1

why doesnt someone just MSpaint a graph that shows lsa vs powerband Rpms?

SSactionLs1

or not

lsx24

iTrader: (45)

The search feature on this site sucks. Sorry, just my opinion when compared to other BBS search implementations. You get sometimes lots of results from the same post, and it doesn't tell you that, and many times multiple posts are mixed together in the results because of date. Also searching by subject doesn't seem to work well for me, as far as producing relevant results. Maybe I just have to get used to this less refined version of search...

If I were to make a single suggestion that would improve it tremendously, I would say that a single thread will should show up only once for a single search.

My opinion being said, does anyone have the link to the thread referenced in the 2nd response?

FDLS6

iTrader: (4)

I hope this helps.. link to 110 112 and 114 lsa g5x2 cams