Big Geek

iTrader: (2)

Researching camshafts is a little confusing. The reason I say this is the jibberish I have listen below has me scratching my head and that is why I have turned to you good folks for some help. This is what I have found.

Lunati claims that the RPM range for their camshaft that specs 212/221@.050, 116-LSA is only 1500-4500.

Comp-Cams claims that the RPM range for their camshaft that specs 212/218@.050, 114-LSA is 1200-6000.

While I realize that there is 2 degrees of difference between the two on the exhaust I am a little confused about which one is accurate. Having said this I also noticed that the Comp has a slightly tighter LSA; but does two degrees really make that much difference? Something seems amiss as the Comp with 3 degrees less duration has an extra 1500-RPM of usable power; what gives?

Now, I do realize that in cam advertising some like to state an effective RPM range while others advertise a usable RPM range. I would have thought the two were the same but I guess I was wrong. I also noticed the following -

Lunati has three different RPM ranges for the 221@.050 duration. They are -

212/221@.050 1800-4800 with an LSA of 116

218/221@.050 2000-5000 with an LSA of 116

221/221@.050 2500-6000 with an LSA of 114

Do items such as ramp speed and LSA play into these variations? Is that why they differ so much on the RPM range? Which company is more accurate regarding their RPM range? Thank you in advance for any and all help.

Jim C.

Big Geek

iTrader: (2)

Anyone, anyone !? Bueller !? Anyone !?

777

iTrader: (21)

There are so many things that play into where a cam makes it's power. No aftermarket cam that I know of peaks below 5600rpms. Typical peaks for aftermarket cams are between 6000-7000. But what you are saying is that the first two cams peak earlier than a stock cam, I don't think so.

LIL SS

iTrader: (9)

I highly doubt they peak that low. The 212/218 might peak around 6k.

Any reason you want such a small cam? A 224 on a 114 will pass CA smog, I'm sure it would pass yours.

Big Geek

iTrader: (2)

I don't really want a small cam but was researching them all to try and make a good choice for my ladies daily driver. When I saw the numbers Lunati was throwing out there it made me wonder what I was missing in the overall picture. I kinda thought the same thing that you two gents are stating in that; why would an aftermarket cam peak lower than a stocker. So does Lunati use some type of different measurement to rate the RPM range on their cams? Then while looking at the Comp stuff I began wondering to myself - "Well hell, which one is right about the RPM range at a given duration"?

Jim C.

Big Geek

iTrader: (2)

To the top

vettenuts

iTrader: (4)

Advance should also play. I installed the Vinci Boss II and the peak is at 5,800 but the power is great from it for street driving. LSA is a 115 and idle is just barely detectable.

Big Geek

iTrader: (2)

Thank you.

Jim C.

PREDATOR-Z

The ICL partly determines the range of power.
Expl: 224 112 +4 >>>>earlier range, peak earlier
224 112 +2 >>>> medium range, peak ~100 rpm later +/-
224 112 +0 >>>> medium +, peak ~ 200 rpm later +/-

Big Geek

iTrader: (2)

Thank you. I have been researching cam posts and reading several of your posts regarding camshafts and must say that I have picked up a good bit of knowledge on LS1 camshafts from the information you have posted. Shukran Assalamu alaikum.

Jim C.