Hemi Killer

iTrader: (6)

I'm thinking the cammotion/FMS lobe. I currently have a standard crane lobe and it's awesome, good torque and nice top-end. I don't want to have to change Dual Valve springs every 25,000 miles. I wouldn't mind every 40,000 miles or so.
I'm not too familar with comp's cam lobes, so please specify which one if you vote for comp cams. Thanks.

jrp

iTrader: (16)

define "best" and "street".

SouthFL.02.SS

Each of those brands has different lobes within its own product line.

Hemi Killer

iTrader: (6)

Like, best for an everyday driver and won't beat the springs to death, but still make good power with some Patriot stage 2 5.3 heads?

Beast96Z

iTrader: (21)

Each cam vendor has multiple lobes to choose from. Your looking for a lobe that isn't as aggresive as most LS based profiles. You can judge the aggressiveness of a cam by subtracting the advertised duration(.006") from the .050" duration. The typical range will be 49-67. 49 being the harshest and 67 being extremly lazy. A Comp XE lobe will have a diffrence of 53, and is were I suggest you look. It still comes off the seat early and provides good low-end power. Springs should make 25-30 k easy, but I would pull one and check it around 20k. Check Comps catalog for the XE list.

Hemi Killer

iTrader: (6)

I never knew that...that's what everyone on here means when they say 55, etc.. Thanks for the info!

Dang, my cam profile sucks for my current cam, 68!

Beast96Z

iTrader: (21)

Cams like that have there place, but a truck isn't one of them. Low end TQ is what get a heavy truck going. You'll want something a bit more aggressive to help move you out from the red-light.

SouthFL.02.SS

From JRP's sticky:





A. Duration:


- The amount of time (in degrees) that lift is generated is called the duration of the lobe. Camshafts operate at half engine speed. This is easy to see because the gear that turns the camshaft is twice the diameter of the crank gear that drives it. That means that the cam spins at half engine speed. Because of this, camshaft duration is always expressed in crankshaft degrees. This makes it easy when it comes time to degree the cam to ensure it is positioned accurately in the engine.

- As you can see in the 2 cam cards there is duration @ .050 and duration @ .006. Duration @.050 is pretty much industry standard and that’s what you’ll see when looking at cam specs from the various sponsors and what most people are talking about when discussing duration

- Duration @.050 and Duration @.006 is a way you can determine the difference between two or more cams with the same given duration at .050. For example a TR224, TSP 224, and Comps 224. The lower the duration @.006 the more aggressive the ramp rate. The more aggressive the ramp rate the more overall and under the curve power.

- If you know the advertised duration (.006) of a cam you can calculate the ramp rate. To do this you take the duration @.006 and subtract it from the duration @ .050. A number of 53 or higher denotes an XE lobe or other mild lobe and a number of 49 or lower denotes an XE-R lobe or other aggressive lobe (Beast and 99 Black Bird T/A)

- Using the T1 and G5X2 as examples is as follows:

T1: 281 (.006) – 221 (.050) = 59

G5X2: Intake 281 (.006) – 232 (.050) = 49
Exhaust 289 (.006) – 240 (0.50) = 49

- Most cam companies use Comp lobes; either an XE or XE-R, the later being the more aggressive of the two. TR uses its own proprietary lobe and FMS uses Cam Motion lobes. Crane also grinds cams with VHP being one of there biggest supporters.

- Intake opening (IO) usually occurs before top dead center (BTDC), while intake closing (IC) happens after bottom dead center (ABDC). For the exhaust side, exhaust opening (EO) occurs before bottom dead center (BBDC) and exhaust closing (EC) after top dead center (ATDC). These data points are listed on the cam card that comes with each new cam.

- Traditional Splits refers to more exhaust duration and lift then intake (tsp231/237, g5x2 232/450, ect). Reverse split refers to more intake duration and lift then exhaust (TR 230/224, X1 230/227). Single patterns are defined as having both the same intake, exhaust duration, and lift. (TR224, TR220, FM4 226/226). Which cam is better depends on your application.

- GREAT technical discussions on cams started by J-Rod from ls1tech: Discussion I Discussion II Discussion III CFM Requirements by RPM (DenzSS)


I encourage everyone to read those threads. They may seem lengthy and over your head, but the information contained provides theories and insight from many industry insiders.

- Valve Events (VE) calculator can be found here (J-Rod)

- Other good technical ****: Engine Theories (Buddy Rawls) and Static and Dynamic Compression (Pat Kelly) and Valve Timing (Comp Cams)

CHRISPY

Personally I love the streetability of the XE-R cam. You need to run a good spring though (PRC doubles are a good choice) and a Comp R lifter might be a good idea. Though stockers work well too.

Compared to slower lobe cams the XE-R lobe design allows better drivability and power per degree of duration.

There are other good choices out there too

SouthFL.02.SS

^ Comp R lifter w/ non adj. rocker not a good idea from what I've been reading as of late.

WKMCD

iTrader: (2)

230-236 XE-R 112 lsa here. Nice cam and very drivable around town. Good mid-range and jumps on top. Full bolt-ons including ported FAST LSX and LS2 TB and we make around 470 RWHP.

Beast96Z

iTrader: (21)

He already stated he didn't want a spring beater cam. XE-R's are currently the most aggresive HR lobe avalible. That's why I reccomended the XE's. I agree the XE-R would be better for performance, but the downside is spring life is reduced.

777

iTrader: (21)

I'd definatly check out the cammotion lobes with futral. They produce excellent mid-range power and aren't too rough on springs. If I were you I'd get the F-13. Seems to be quite popular, and for obvious reasons.

Beast96Z

iTrader: (21)

Futrals lobes are good too, but still stout at 50* of seperation. There just 1* off from a XE-R.

SouthFL.02.SS

Thanks for posting this. I've been trying to find out where the FMS lobes check in at. FMS also has one grind on their site that states "semi aggressive", instead of "aggressive"....

FM-F6-112 FMS Custom Grind Camshaft - 226"/230" .575"/.595" 112LSA - semi-aggressive profile with a 2000-6800 RPM range, rough idle $389.00
FM-F6-114 FMS Custom Grind Camshaft - 226"/230" .575"/.595" 114LSA - semi-aggressive profile with a 2000-6800 RPM range, fair idle $389.00


I wonder where the F6 checks in.

Okie5.3

iTrader: (1)

But consider Crane measures from .004" and not the usual .006", so it would appear to be a lazier lobe at first glance.

777

iTrader: (21)

I have a feeling this poll will be skewed quite a bit because everyone knows about comp cams and their BIG name in racing. A good amount know about futral and cammotion and hardly anyone knows about crane. So that is how your poll is looking. You have 7 different people that have posted in here besides yourself and you have 35 votes, it's not hard to just vote without giving reason as to why. That's why I have never been a huge fan of poles. People vote for what they've heard of not what is correct or the best choice.

orangeapeel

iTrader: (18)

That is true...I think people are picking just what they know. It is very hard to say what is the best without lots of results as evidence to what people think.

Hemi Killer

iTrader: (6)

How do you like your cam? I bet it sounds awesome!

sprydncamd ta

iTrader: (4)

fm 13