Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 02-17-2001, 08:03 PM
Posts: n/a
Got a few questions re/ the m103 2.6 vs the 3.0, my roommate is an MBZ mech and he says there the same but for some reason the head is not interchangeble -and cannot provide a reason why-. Before I get into the Q's, here is my objective: I want to bump the displacement of the 190e m103 2.6 motor (90'+) using OE internals.

1)What are the block differences other than cylinder size (deck height, main bearing width) between the 2 motors?

2)Barring any major unforeseen variances, could the 2.6 block be milled to accept the standard 3.0 piston -I think the 2.6 is 83mm and the 3.0 is 89-, is there enuff block material, would pin height be an issue?

3)What is the crank stroke and rod length difference?, basically could the 2.6 block be milled to accept the 3.o internals w/o changing compression?

4) If this simply wont work what in your opinion be the largest DEPENDABLE cylinder rebore for the 2.6 block?

Any and all comments and opinions are greatly appreciated, thanks for the great forum!
Reply With Quote
Old 02-18-2001, 01:36 AM
Registered User
Join Date: Apr 2000
Posts: 412
why not consider a motor swap. If your 2.6 is good you can sell it and pickup up a 3.0 103 engine. You may also consider a 104 engine 3.0 with a 24 valve head. Or turbocharge your 103. I,m sorry that I dont know if the engine can be bored and stroked but I am suggesting some alternatives.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
Reply With Quote
Old 02-19-2001, 11:27 PM
Registered User
Join Date: Jul 1999
Location: Youngstown, OH
Posts: 150
As I understand it the bore is the only difference; which is why the heads won't interchange. You'd end up with unevenly mated surfaces (sharp corners) which could wreak havoc with detonation, pre-detonation, shock-wave fronts, etc; but ask any machinist if it can be done easily. You should be able to overbore a 2.6 to a 3.0 or larger as long as you address the heads and check the piston to rod fit. Check out,

They over bore both a 2.6 and a 3.0 to a 3.6 with the same piston and rod set. I believe they mill the heads to accommodate the larger bore.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
190E Motor Mount Replacement haasman Tech Help 9 04-03-2009 02:59 PM
Anyone had this problem with the M103 motor??? mike690003 Tech Help 13 09-24-2003 08:31 PM
How to remove A/C blower squirrel cage from motor?? jshaheen Tech Help 3 09-19-2003 11:52 AM
What Blower Motor Fuse?? EricSilver Tech Help 20 10-06-2002 12:14 AM
190E 2.6 swap out for 3.2 12 valve motor 2phast Performance Paddock 8 08-17-2001 08:22 AM

All times are GMT -4. The time now is 02:20 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page