altitude change - Mercedes-Benz Forum

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 11-09-2006, 12:03 AM Thread Starter
BenzWorld Newbie
 
Date registered: Oct 2006
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
altitude change

just drove my 71 250 from sea level (mazatlan mexico) to 7,000 ft (patzcuaro). losing power and stalling at idling. adust the dual carbs and what else? thanx, edward
ednlyn is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 11-09-2006, 06:06 AM
BenzWorld Elite
 
flyboyike's Avatar
 
Date registered: May 2003
Vehicle: 2012 Focus SE
Location: Ormond Beach, FL
Posts: 7,699
Mentioned: 1 Post(s)
Quoted: 68 Post(s)
Quote:
Originally Posted by ednlyn
just drove my 71 250 from sea level (mazatlan mexico) to 7,000 ft (patzcuaro). losing power and stalling at idling. adust the dual carbs and what else? thanx, edward
That's about it.

Felicita e un bicchiere di vino con un panino.
flyboyike is offline  
post #3 of 16 (permalink) Old 11-09-2006, 04:32 PM
BenzWorld Elite
 
Djenka018's Avatar
 
Date registered: Jan 2005
Vehicle: '80 450SLC Afro RHD Ikonengold
Location: ɹǝpu∩ uʍop 'ʎǝupʎS
Posts: 2,444
Mentioned: 0 Post(s)
Quoted: 56 Post(s)
Talking of devil, how to adjust for high altitude for minimal loss of power?

By-yhe-book lean and loose a lot of power, a bit richer or a bit leaner?

What about ignition angle?


TNX

.
Vitamin C for SL... the SLC
Djenka018 is offline  
post #4 of 16 (permalink) Old 11-09-2006, 04:52 PM
BenzWorld Newbie
 
Date registered: Nov 2006
Posts: 4
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Just a bit richer
just make it more advance. is better
Grandy is offline  
post #5 of 16 (permalink) Old 11-09-2006, 04:54 PM
BenzWorld Elite
 
flyboyike's Avatar
 
Date registered: May 2003
Vehicle: 2012 Focus SE
Location: Ormond Beach, FL
Posts: 7,699
Mentioned: 1 Post(s)
Quoted: 68 Post(s)
Quote:
Originally Posted by Djenka018
Talking of devil, how to adjust for high altitude for minimal loss of power?

By-the-book lean and loose a lot of power, a bit richer or a bit leaner?


TNX
Little bit leaner, if possible. This is somethig we deal with quite a bit with airplanes. You always lean as you climb. Ideally, you want to end up at the mixture setting that will give you slightly below-peak EGT (Exhaust Gas Temperature). With a car, I'd see what the power is doing and how smooth things are and try to keep things that way.

Felicita e un bicchiere di vino con un panino.
flyboyike is offline  
post #6 of 16 (permalink) Old 11-09-2006, 04:54 PM
BenzWorld Newbie
 
Date registered: Nov 2006
Posts: 4
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Try to adjust the Ignition Distributor make it more advance.
adjust the fuel little bit rich
Grandy is offline  
post #7 of 16 (permalink) Old 11-09-2006, 04:56 PM
BenzWorld Newbie
 
Date registered: Nov 2006
Posts: 4
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
adjust ignition more advance, smaller gap of spark plug 0,7mm
adjust the fuel more rich.
Grandy is offline  
post #8 of 16 (permalink) Old 11-09-2006, 06:57 PM
BenzWorld Elite
 
Djenka018's Avatar
 
Date registered: Jan 2005
Vehicle: '80 450SLC Afro RHD Ikonengold
Location: ɹǝpu∩ uʍop 'ʎǝupʎS
Posts: 2,444
Mentioned: 0 Post(s)
Quoted: 56 Post(s)
Quote:
Originally Posted by flyboyike
Little bit leaner, if possible. This is somethig we deal with quite a bit with airplanes. You always lean as you climb. Ideally, you want to end up at the mixture setting that will give you slightly below-peak EGT (Exhaust Gas Temperature). With a car, I'd see what the power is doing and how smooth things are and try to keep things that way.


isn't leaner = hotter?
Will consider havin exhaust temperature measured.
What the optimum temp could be/ where to enquire 'bout temperature?

____________________________

My mech had it set on a bit richer for two reasons (as per him, based on my case):
When a bit richer but not as for sea level (idealy as half the altitude to where I live - 1600m) the car will have overall good performance wherever I travel.
He claimed: richer = no burned valves risk @ sea level, more performance when @ sea level, smoother idle + low revs performance at altitude.

80% of my driving is <3000rpm

.
Vitamin C for SL... the SLC
Djenka018 is offline  
post #9 of 16 (permalink) Old 11-09-2006, 06:59 PM
BenzWorld Elite
 
flyboyike's Avatar
 
Date registered: May 2003
Vehicle: 2012 Focus SE
Location: Ormond Beach, FL
Posts: 7,699
Mentioned: 1 Post(s)
Quoted: 68 Post(s)
Quote:
Originally Posted by Djenka018

isn't leaner = hotter?
Will consider havin exhaust temperature measured.
What the optimum temp could be/ where to enquire 'bout temperature?
Leaner is hotter, yes, so on an aircraft we'd watch the EGT gauge and stop leaning slightly before it peaked.

Felicita e un bicchiere di vino con un panino.
flyboyike is offline  
post #10 of 16 (permalink) Old 11-09-2006, 08:03 PM
BenzWorld Elite
 
Djenka018's Avatar
 
Date registered: Jan 2005
Vehicle: '80 450SLC Afro RHD Ikonengold
Location: ɹǝpu∩ uʍop 'ʎǝupʎS
Posts: 2,444
Mentioned: 0 Post(s)
Quoted: 56 Post(s)
Quote:
Originally Posted by flyboyike
Leaner is hotter, yes, so on an aircraft we'd watch the EGT gauge and stop leaning slightly before it peaked.

I wish same gauge existed under my hood...

Definitively will see how to apply same on 450 engine... I guess IR sensors can help somewhat to check temperature of gases, combined with CO2 tester.

I worry that if engine set (leaner) for 1600m (~4800ft) that when at sea level it can be so lean that I could burn valves.

TNX

.
Vitamin C for SL... the SLC
Djenka018 is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
     
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode



    Similar Threads
    Topic Author Forum Replies Last Post
    High Altitude Testing Boardmonger W123 E,CE,D,CD,TD,TE Class 7 05-01-2006 11:17 PM
    dynamic seats at altitude Scoundrl W211 E-Class 1 02-02-2005 08:39 PM
    High altitude idle COOPER W124 E,CE,D,TD Class 2 02-24-2003 09:28 PM
    High altitude NOS ques: BillT R170 SLK-Class 2 09-15-2001 03:18 PM
    Supercharger performance at altitude? Art Gorski R170 SLK-Class 1 07-11-2001 05:27 AM

    Posting Rules  
    You may post new threads
    You may 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

     

    Title goes here

    close
    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome