Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




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

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-26-2000, 02:46 AM
kevinjh
Guest
 
Posts: n/a
Hi All,

Without the availability of regular leaded fuel is it safe to use super unleaded with a 97 octane rating for my car? I've heard that problems could occur on the valve seats. Mine has a mechanical fuel injection. We also have regular unleaded with a 92 rating. What would be best? I run my car around 2000 miles a year.

Thanks,

Kevin
Reply With Quote
  #2  
Old 01-26-2000, 09:35 AM
WDurrance
Guest
 
Posts: n/a
Hi Kevin,
Unleaded fuel won't hurt your car. All of the Mercedes gas engines have hardened valve seats. The only change M-B made when they produced engines for use with unleaded fuel was the addition of 2% tungsten to the seat's alloy. I've been running my 250SE, 3.5 and 6.3 on unleaded for 10 years with no problems. The original valve seat material seems to be just fine.
I would use the 97 octane variety when available. My stuff runs okay on 94 octane.
Regards,
Randy D.

------------------
W.R.Durrance
ASE Master Tech
Mercedes Tech 19 Years
Reply With Quote
  #3  
Old 01-26-2000, 10:56 PM
kevinjh
Guest
 
Posts: n/a
Hi Randy,

Thanks for your reply. I guess I'll start using the Super Unleaded with a 97 octane rating.

Kevin
Reply With Quote
  #4  
Old 02-11-2000, 11:20 AM
Rodd
Guest
 
Posts: n/a
Hi. I am negotiating for a 66 230sl and I never thought to ask the owner about the fuel he uses. By the previous posts in this thread, can I assume that I should just use the highest octane unleaded I can get? Is there a serious problem with using regular 87 octane? Also, was there such a thing as US spec vs. Euro spec with regards to the engine (compression ratio)?

Thanks,
Rodd

[This message has been edited by Rodd (edited 02-11-2000).]
Reply With Quote
  #5  
Old 02-11-2000, 04:54 PM
WDurrance
Guest
 
Posts: n/a
Hi Rod,
Use the highest octane unleaded you can find. Around here that's 93 or 94 octane. The 87 octane would require retarding the ignition timing and may cause damage. The early SOHC sixes are noisy enough to mask the sounds associated with "pinging", so its best to use the appropriate octane fuel for the car.
There were no differences in US Vs. European engines in 1966, but some of the models were made to run on the poor quality fuel that was once a problem in North Africa. So there were "low compression" engines built for these specific markets.
Regards,
Randy D.

------------------
W.R.Durrance
ASE Master Tech
Mercedes Tech 19 Years
Reply With Quote
  #6  
Old 02-11-2000, 05:39 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777

The compression specs. are stamped on the head in the casting #.
This is located on the head,drivers side, above and 1 inch back from the # 2 spark plug, at the seating line for the valve cover.
The last 2 digits will be the compression Ratio. 9:5 is the standard ratio.
Reply With Quote
Reply

Bookmarks

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
WTB R107 280SL parts mike690003 Mercedes Used Parts For Sale & Wanted 2 04-26-2004 01:10 PM
so, is 80/100 watt H4 safe for my euros with factory wires? frosty Tech Help 6 08-25-2003 05:01 AM
'70 280SE and '70 280SL for sale Aaron Mercedes Cars For Sale 0 07-02-2002 08:29 PM
280SE 4.5 rear end in a '69 280SL? ivorysl SL Forum 1 08-11-2001 01:49 PM
280SE 4.5 rear end in a '69 280SL? ivorysl Vintage Mercedes 3 08-06-2001 10:43 AM



All times are GMT -4. The time now is 07:37 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, 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