Originally Posted by bicylindrico

I did not check any of those variances. Yes, huge difference between the AMG and stock 500 cams. My understanding is the later EVO engine bumped the compression to get the extra HP but I have nothing to confirm this. The N/A camshafts that I measured would have been earlier camshafts but I too would like to know if the later N/A 55 engine camshafts were any different. I guess I will have to locate and buy a set to know for sure but I would prefer to have them reground anyway to a final grind that the early ones could provide so I am not that inclined to track down a set.

Check out my thread I have running in the W124 section to see the M113 I have been building. This engine will be interesting as it will be a stock M113 with some hopped up reground AMG camshafts, stand alone ignition system and a custom carbureted 650cfm intake manifold. I am thinking I may also run a 100hp shot of nitrous to see what the limits may be on the standard 5.0 liter version. It's going to be a fun project.
https://www.youtube.com/watch?v=eydu2LWz23E

Originally Posted by bicylindrico

I know, dead horse subject. Just sharing for those that may search for info in the future. When doing my own research I found numerous comments on how naturally aspirated 55 engines had "better" camshafts than the Kompressor variants and I wanted to share my findings for those that may be searching for the information I was looking for. That is 'what is the best M113 camshafts to install in my M113.' I actually found that CatCams has the camshafts I really want, not Kleeman, not RaceIQ, not AMG but that place over in Europe that most of you never heard of.

This thread is more to inform those looking for readily available camshafts (eBay) for their standard 5.0 liter M113 engines as a cheap upgrade in performance from a camshaft standpoint. I have a set of standard M113 5.0 liter camshafts, a set of N/A 5.5 liter AMG camshafts and a set of Kompressor 5.5 Liter camshafts and I can tell you the lobe lift alone is exactly the same between the N/A 5.5 camshafts and the Kompressor 5.5 camshafts. I cannot attest to the duration as I am not able to profile the lobes but I really doubt there is any difference between the two.

A couple things I noticed with the variants: The 'old' 55 N/A camshafts are stamped AMG at the end of the camshafts with some numbers and such. The area with the stamping is smooth on the earlier camshafts and the later boosted cams are a rough casting in the same area. The 'old' N/A camshafts are thinner and lighter with the welch plug (freeze plug) being a larger diameter meaning the thickness of the camshaft core is thinner and thus lighter.

My thoughts are that initially AMG controlled who manufactured the camshafts and that later whoever MB utilized to make the standard M113 camshafts, would then start producing the AMG camshafts as well. It's harder to tell the AMG kompressor camshafts from the standard M113 bumpsticks because of this. I see the cast area I mentioned has a white coating on the AMG cam so maybe that means something to help distinguish? Otherwise you would need to measure.

My measurements show a base circle on the camshaft lobes at 1.5" exactly on all camshafts and all lobes.The camshafts I have show specs as such:
All M113 camshaft lobe base circles measure 1.5" exactly
Standard 5.0 intake lobe lift .
.249" intake
.265" exhaust
AMG Naturally Aspirated
.290" intake
.290" exhaust
AMG Kompressor
.290" intake
.290" exhaust

My findings are there is no difference between the naturally aspirated and kompressor engine camshafts. I am guessing MB just went with AMG's initial camshaft specs and had their own (cheaper) supplier manufacture the camshafts. Hope this helps someone in the future.

Top is standard 5.0 M113, second from top is 'old' N/A 55 and bottom is kompressor

Difference in core thickness/weight

Markings
Here are the markings between the standard M113 camshaft and the later Kompressor camshaft. Looks to be the same manufacturer to me.