lightweight lifter secrets revealed...
 

<center><img src="http://pictureposter.audiworld.com/711/lwlifter2.jpg"></center><p>
I pretty much gave everyone the answer to the question yesterday when I said it's "all in the shell." All of the weight-savings is accomplished in the lifter shell body.

In the lower chamber that sits over the valve springs the lifters share an idental wall thickness of .034". The dividing wall that separates the sealed upper from the open lower are same thickness as well tho the cylinder flange that the oil-plunger assemblies slide in is facing the upper cylinder in the LW lifter and the lower area in the stock lifter. This makes for a lifter with larger oil volumes.

All comes down to lifter body (shell) thickness. Other than them being the same in both lowers the LW one has a .033" thick wall while the stock lifter has a .061" wall thickness.

Tops are slightly different in that the stock lifters' top is .095" thick while the lightweight top is .080" thick.

Internal components are identical in EVERY way with not even a 1/100 gram difference in the their entire assemblies and are actually interchangeable with each other.

Weights are as follows after ultrasonic cleaning and oil removal:

Stock lifter: 69.1g
LW lifter: 48.28g
Net Difference: -20.82g (30.12% lighter)

About time . . .
 

Just kidding! :-P

But a 250 gram difference when you add all 12--That's not bad.

Not bad at all...
 

Every little bit helps, especially when dealing with rotational inertia.

Well, to the camshaft anyway being that its doing at the work. ;)

SO..if & when it ever comes time for indiv's to r&r lifters, is it worth subbing LW lifters
 

in place of stock when there are no other weight reducing modifications done to the valve-train? I guess what I'm getting at is would LW lifters have any positive effect on overall weight reduction if they're totally on their own?

and don't tell me that it's a system and that each component in the system is limited to the "weakest link" and a completely upgraded system will be greater than the sum of its parts etc.. =P

thx UrS4

check yah later

I'm thinking LW lifters and AAH (or other) cams done at the same time...
 

would be an incredibly good bang-for-the-buck mod. I believe LW lifters and nothing else would be worthwhile and certainly "feelable" especially in the post-IM switchover RPM range. But at this point in time I can't say by how much.

fair enough.. that's cool. i guess i already have the AAH cams, but my lifters tick crazy-like
 

so whenever it comes time to be replacing them, LW lifters is something that I just might consider...

check yah later

I switched to Mobil 1 5w40, lifter click went completely away unless I'm low on oil
 

In fact, that's <b>HOW</b> I know I'm low on oil.

Did your oil consumption increase, decrease, or stay the same with the 5W-40?

your car must loooove you.. I'm on M1 15W40 & nuttin' really changed.
 

can't seem to find 5w40 up here in Kanata =(

funny you should mention that... not the oil weight but lifter noise when oil level is low. Me too!