300E 3.4 AMG - PeachParts Mercedes-Benz Forum

conski · #1 11-10-2010, 11:46 AM

Quote:

Originally Posted by nick.ged

stock piston 'dimentions' wil give 3.4, if you want 3.6 it needs a rebore, even if you stay at 3.4 i would expect uprated pistons (forgies) wouldnt be a bad idea?

What kind of power increase could you expect on an m104 (cis-e) increased to 3.4 with stock pistons and custom rods?

Also, what would be the downfall of not using forged pistons?

Costs on getting custom rods made?

MAG58 · #2 11-10-2010, 11:17 PM

Quote:

Originally Posted by conski

What kind of power increase could you expect on an m104 (cis-e) increased to 3.4 with stock pistons and custom rods?

Also, what would be the downfall of not using forged pistons?

Costs on getting custom rods made?

You'll need to do a lot of work to the block. At 88.5mm the throws hit the side of the cylinders. You'll need to eye-brow them or clearance it somehow. You also need to get 16lbs out of the SDL crank while you're bored.

A set of rods is probably going to be in the 1200dollar ballpark. Just remember you've got a 217.625mm deck height to play with, and a 92.4mm stroke.

Cast pistons are alright if you're not going to turn it that tight. They're more brittle and are less tolerant of detonation than forgies.

Also remember, AMG motors had different intake cams (some say shrick, but I'm not sure I believe that yet), the 3.4 had a ported inlet and exhaust while the 3.6 just had a ported exhaust.

conski · #3 11-11-2010, 07:22 AM

Quote:

Originally Posted by MAG58

You'll need to do a lot of work to the block. At 88.5mm the throws hit the side of the cylinders. You'll need to eye-brow them or clearance it somehow. You also need to get 16lbs out of the SDL crank while you're bored.

A set of rods is probably going to be in the 1200dollar ballpark. Just remember you've got a 217.625mm deck height to play with, and a 92.4mm stroke.

Cast pistons are alright if you're not going to turn it that tight. They're more brittle and are less tolerant of detonation than forgies.

Also remember, AMG motors had different intake cams (some say shrick, but I'm not sure I believe that yet), the 3.4 had a ported inlet and exhaust while the 3.6 just had a ported exhaust.

Thanks for all of the info Bob!

It seems like it could be a fun project, just have to find a good machine shop down here in florida to help me with the block issue. Definitely going to port my exhaust and intake though even before I do the bottom end conversion.