617 performance cams - Page 2 - PeachParts Mercedes-Benz Forum

OM616 · #1 01-10-2011, 12:48 PM

Quote:

Originally Posted by Army

*****y *****y

I'm sure everyone who has contributed to this thread has done so with the best intentions - there is no reason to be rude.

Apparently it depends on the material - cast iron or steel:-

http://en.wikipedia.org/wiki/Camshaft

Also - I guess - dropping cast iron is more likely to result in a break because of the HCP structure

With the stock cast cams breaking I would like to have a nice steel one. Having some steel blanks made would not be too much trouble. Cut & grind them, and then have them heat treated.

I am not sure how close the stock lobes are, but at some point in the quest for more lift the lobe not fit through the pedestals, after that, reducing the base circle is all that is left. Not sure if shorter followers are possible, if so then they may also be a way to amplify the cam profile.

ForcedInduction · #2 01-10-2011, 12:54 PM

Quote:

Originally Posted by OM616

With the stock cast cams breaking

Can you please link to one or more examples from post 1980 models?

layback40 · #3 01-11-2011, 01:42 AM

Quote:

Originally Posted by OM616

With the stock cast cams breaking I would like to have a nice steel one. Having some steel blanks made would not be too much trouble. Cut & grind them, and then have them heat treated.

I am not sure how close the stock lobes are, but at some point in the quest for more lift the lobe not fit through the pedestals, after that, reducing the base circle is all that is left. Not sure if shorter followers are possible, if so then they may also be a way to amplify the cam profile.

Hey Army,
If I can get 800k miles out of one with no problems & 500k miles on another & both still ok, I think you dont have much to worry about.

Stretch · #4 01-13-2011, 04:58 AM

Quote:

Originally Posted by layback40

Hey Army,
If I can get 800k miles out of one with no problems & 500k miles on another & both still ok, I think you dont have much to worry about.

Hey layback40 - I'm not worried I'm just playing with bits until this dreadful weather clears up and I can be inspired to get out and finish the job!

4x4_Welder · #5 01-13-2011, 12:56 AM

I missed this thread, I've been talking with the guys at Delta Camshaft about a performance grind for the 617 and they need two things: A stock cam, and the clearance between the valves and piston. These guys do great work, I've used both a torque grind in a Subaru EA81, and what I could best describe as a mid-range grind in the 300-6 in my van, both with spectacular results. They can also play with the timing as well to move the powerband.