CSM Huber

I found the 2.4L VVT Camshaft specs at the GM Tuner Source blog to be an interesting comparison to the other ECOTEC engine cams.

INTAKE________Cam______Valve_______Valve___Duratio n____Valve area
Part___________Peak Lift__Peak Lift_____Timing__@1mm lash__@1mm lash
12587985 - LSJ____5.9557____10.03790354___100_______196.50___ ___1117.70
12590699 - ’07 L61_5.9804____10.07953361___116_______198.40______ 1112.90
12578511 - LE5_6.2551____10.54252068_135______210.30_____1253 .30
12589335 - LNF____6.111207__10.29999939___126_______203.60___ ___1171.30

EXHAUST______Cam_____Valve________Valve_____Durati on____Valve area
Part___________Peak Lift__Peak Lift_____Timing__@1mm lash__@1mm lash
12584363 - LSJ____5.9543___10.04392819____-115______191.70________1076.40
12590700 - ’07 L61_5.9752___10.07918306____-108______193.30________1078.00
12578512 - LE5__5.95143_10.03908697__-125_____195.40______1092.70
12589340 - LNF___ 6.106106__10.30000003____-120______194.00_______1106.00

Notes regarding camshaft interchangeability:
􀀁 The L61 (2.2L ECOtec) camshaft changed for the 2007 model year. This change was to go to a less
aggressive cam profile with less noise, less jerk, less impact load, and better valve dynamics.
􀀁 The 2007 L61 intake cam cannot interchange with any other production ECOtec cam.
􀀁 The 2007 L61 exhaust cam is interchangeable with the ‘06 L61 and the LSJ exhaust cams.
􀀁 The 2006 L61 intake and LSJ intake and exhaust cams are the same casting. However, the LSJ cam
sensor is driven with a hex bushing pressed into the rear of the exhaust cam. In order to operate
properly, the production LSJ cam sensor requires a cam which has a hex bushing pressed into the
exhaust camshaft with the exact orientation in angularity to the cam.
􀀁 The 2006 L61 cams and LSJ cams are the same profiles at different timings. The 2006MY L61
timings are 116 intake, -103 exhaust. The LSJ timings are 100 intake, -115 exhaust.
􀀁 The LNF and LE5 exhaust cams could interchange. The LNF and LE5 cams are not interchangeable
in any other way or with any other ECOtec cams.
Valve springs are the same across all variants, and should be upgraded for high-rpm operation or
increased lift.
The GM Performance Parts ECOtec cam set (88958648 set or 88958636/7 individually) are aggressive
race cams, not stock-replacement cams. They require upgraded valve springs and retainers. These
cams were designed for a race motor, using the ‘06 L61 as the starting point. The cams will not fit the
2.4L LE5 head and will not work with the stock ECM or lifters. They physically fit the 2.0L LSJ head, but
the vacuum pump / cam sensor will not work in a regular production engine.

WhiteSSBalt

I'm not gonna lie.......as much as I know about cars and all.......cams have always been over my head, lol.

Stock cam ftw! Lol

CSM Huber

Look at it this way, if bigger is better, compare the numbers of the LE5 cams to the other engine cam numbers. More intake lift and duration should equal more air flow at high RPM. And keep in mind these are maximum figures are for the Constant Variable Valve Timing cams of the LE5. The starting and low RPM lift and duration figures are less.

Its the CVVT that "opens up" the breathing potential of 2.4L. Obviously the Forced Induction engines can operate with a milder cam.

Schultzay

sweet, i couldn't find my decoder ring so i'm glad you stepped in to help lol

Jackalope

Now all someone needs to do is come out with different ratio rocker arms and we're in bizz! Changing the rocker arms is just like doing a cam swap but without nowhere near the amount of work.