Just read up an article on musclecars that pretty much states this. Not worth it for power gains but more for efficiency reliability, longevity and heat management. Which would be great considering my cams have slight pitting already and surely the tappets are same. Doing this myself I’m putting the money I would’ve spent at the dealer into “better” parts. Most sane people will probably settle for SLS upgraded tappets and find it does the job just fine.

 

This is a good find, that you were able to order one without a vin number.
Also a good find that you micrometer-ed it out and it's the same dimension.

As far as the stock tappets and the weak valve train. Many of these cars were a lease with the first owner. I have seen first hand how some of these VP types don't like to spend the $90 needed for an oil change, or don't feel like spending the time or being inconvenienced with a loaner, so that the car gets an oil change. I've seen and questioned a CFO which had company lease on a 335i, where throughout the lease duration, he did not allow one oil change to his company car...

Then the second owner and certainly third are enthusiasts and then the car gets a bad rep for engine rotating assembly problems.

The M156/M159 regular tappets may be good enough, when you don't cheapen and replace them together with new cams. Coupled with quality oil and frequent changes, the M156 may not have a real problem.

As far as lightweight engine moving components..
They do show up, but not where people expect to see them.
I will try to dig out a comparison video of a Tach on the same car before and after lightweight internals, when revved in neutral. It revs up faster and revs go down faster.
How does this translate? Maybe better shifts, as the RPM between shifts drop faster?

You know how some reviewers said that the C63 black series shifted better?

In my open source Sti engine, I had to go into a table called RPM drop catch, once I did a lightweight flywheel. It would stall in-between shifts.

 

Seems like 99% of people are wasting their money with the SLS BS buckets.

Mercedes addressed the original design defect when they released the SLS buckets (which also superseded any M156 bucket part numbers) and that "magical" BS coating still exists at the top of the SLS bucket, where it counts most.

My original buckets even could have been reused but when I pulled the VC and saw how perfect my cams were, the incentive was there to upgrade and protect them in the long run.

 

do you by chance know how much lighter each of them are compared to the regular pieces ?

 

100% chance that fractionally lighter lifters alone make absolutely zero measurable difference. Don’t give this guy false hope. “Lightweight internals” generally refer to lighter pistons, rods, cranks etc where you’re saving pounds off the rotating mass. You know that. Lifters alone aren’t going to magically turn your car into some sort of high-revving F1 car, the whole premise is just completely false.

 

Put them in, rev it to 8k and see what happens...

 

I think i lighter lifter will make more power at 7500 rpms but thats just me.

Why else would the black series sls get them ? You would think the amg engineers knew something to put them in the sls black series and get 622hp out of an na 6.2 liter with all catalytic converters on the car.

Just watched engine masters put a solid lifter on a hydraulic cam and picked up 10hp without changing anything else.

 

What's a hydraulic cam?

 

Cam made for hydraulic lifters. They tried a solid lifter on a cam not made for them and picked up power.

 

I know for a fact that lightened internals make the power up top in the rev range. Not sure what blok is talking about false hope and racecars. This car is heavy so it won’t come close. I asked a simple question if the full ceramic tappets made power. I’m not putting it in for power so it’s not going to be an F1 race car, no need to get so sensitive. I’ll put these in rev it to 8 once or twice and see what happens before and after it’s done.

 

Do a dyno before and after. The cam is what makes the sls make so much more top end power... the lifter just transfer the camshafts love lift to the valve and force it open for a given time(duration) and amount (lift). If you don’t change your cam and the factory lifters aren’t experiencing valve float which the m156 don’t you won’t make any more power.

 

Wasn't that was a pushrod engine with rockers? The weight difference between solid and hydraulic rollers would be way more significant than BS vs non BS buckets.

 

when I take the stockers out I’ll weigh them as well.

 

That’s weight with factory coated oil. I didn’t wash them so values correct +/- 1 gram. I also didn’t wash my wife’s food scale after use.

 

Thanks a lot and that’s a fairly large difference no doubt that would help with higher rpm use

 

What diameter where the buckets for C63/SLS? Larger diameter buckets support larger lift camshafts.

 

I went to a mercedes dealership with the product code for BS lifters to place in my 2014 C63 507 Coupe. They did not know if it would fit or not. But I took the chance, and had seen on my research people running it, years back. So yes, the BS lifters WILL work with any M156 engine. Hope this helps. Cheers.

 

I found on some other Mercedes models that Mercedes likes to use 35mm tappets in their DOHC on buckets style of valve actuation. According to the formula that I have the max lift that size tappet should support is 35mm/25.4mm-inch = 1.38"/2 = .69 - .060 ( clearance from edge of bucket ) = .630" ( 16mm ) of max recommended lift.