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Author Topic: ALTITUDE ADJUSTMENT  (Read 3110 times)

keesing

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ALTITUDE ADJUSTMENT
« on: February 16, 2006, 14:35:36 »
My '67 250SL will be transported from sea level to 7,500 ft above sea level...
1st: Will it start?
#2: If it does start, will it cause any problems driving it about 75 miles before I adjust it or is that just asking for problems?
#3: Is the correct adjustment simply on the fuel injector and air adj screw - or is there more to it??
 :mrgreen:

I knew it doesn't have carbs... :?
« Last Edit: February 16, 2006, 15:09:25 by keesing »
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J. Huber

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Re: ALTITUDE ADJUSTMENT
« Reply #1 on: February 16, 2006, 15:02:41 »
Can't say for that high -- but mine starts fine in Tahoe which is 6000 and Santa Barbara which is about 60. I bet if your car started at sea level, it will also start at 7500. It may run richer up there since the air is thinner. Our cars don't have a carburator -- but there are ways to adjust the mixture nonetheless. I'd be careful and research before doing too much. It is my understanding that the FI has a built-in mechanism (altitude compensator)that takes into consideration altitudes...

James
63 230SL
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James
63 230SL

DavidAPease

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Re: ALTITUDE ADJUSTMENT
« Reply #2 on: February 16, 2006, 15:42:56 »
I drove my 230SL across Monarch Pass in the Rockies last summer, an altitude of 11,300 feet.  No problem at all.  I believe that the altitude compensator in the FI system takes care of everything.  

I certainly wouldn't expect to have to adjust anything as one drives up and down mountains.  As Chad said "it's a Mercedes".

-David Pease
'66 French 230SL
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-David Pease
 '66 230SL (Originally sold in Paris)

Chad

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Re: ALTITUDE ADJUSTMENT
« Reply #3 on: February 16, 2006, 17:11:41 »
It will most likely start. Just fill it up and drive it up I-25 and figure everything out when you get home. There are several good Mercedes places in Santa Fe area. Find someone who knows it.

« Last Edit: February 16, 2006, 17:13:31 by Chad »
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Cees Klumper

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Re: ALTITUDE ADJUSTMENT
« Reply #4 on: February 16, 2006, 18:33:25 »
The altitude compensator is AKA the barometric pressure regulator if I am not mistaken. It's that big round canister thing sitting on top.

quote "I am always right. Only once I though I was wrong, and even then I was mistaken"

Cees ("Case") Klumper in Amsterdam
'69 white 280 SL automatic
« Last Edit: February 16, 2006, 18:34:27 by cees klumper »
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Cees Klumper
1969 Mercedes 280 SL automatic
1968 Ford Mustang 302 V8
1961 Alfa Romeo Giulietta Sprint Coupe 1600
1962 FIAT 1500S OSCA convertible
1972 Lancia Fulvia Coupe 1.3
1983 Porsche 944 2.5
1990 Ford Bronco II

enochbell

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Re: ALTITUDE ADJUSTMENT
« Reply #5 on: February 17, 2006, 10:08:47 »
Yes, the IP does auto-adjust for barometric pressure by moving the regulator along the rack at all throttle positions (not just at idle) when relative pressure is less than 1 atmosphere.  That, and the way the cone in the IP is mapped (it is milled in three dimensions but it is not concentric: rather, it is parabolic shaped, and how MB decided how to do this is a mystery to me) is one of the most amazing engineering feats, perhaps one of the real engineers on the board can give a quick tour.

Best,

g

'64 230sl, fully sorted out...ooops, spoke too soon
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