Engine RPM speed - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 06-25-2012, 12:11 AM Thread Starter
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Date registered: Jun 2012
Vehicle: 1977 450SLC American model 107.024
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Engine RPM speed

Hello all.
I am a new member here and at at the Benz world in general.
I am a new owner of 1977 450SLC.
I am not familiar with car mechanic, and have very limited knowledge, but always happy to lean from the expert .
I have a question regarding the RPM speed.
What is the nominal RPM speed for my car (450SLC) when cold, warm and when A/C is on While D is shifted while it is warm, above 175.
Thank you in advance.
Goli.
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post #2 of 5 (permalink) Old 06-25-2012, 09:29 AM
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About 750rpms no less than 650, although a correct tuned engine can go down to 450

Brian O
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post #3 of 5 (permalink) Old 06-25-2012, 04:30 PM
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Quote:
Originally Posted by bostosh View Post
About 750rpms no less than 650, although a correct tuned engine can go down to 450
450???? WoW! I'm not sure my Grand Old Beast could survive at such a low metabolism
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post #4 of 5 (permalink) Old 06-25-2012, 10:54 PM Thread Starter
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Date registered: Jun 2012
Vehicle: 1977 450SLC American model 107.024
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Thank you .
Just tuned her up and now above 175 she is on 750 when idle.
while on Drive (without moving) she stands on about 650 and with A/C on she drops to about 550.

I was starting to take a look at the vacuum lines as well and saw few strange things.
The charcoal canister has only one line going out to the gas tank and the other is missing, any idea to where it should connected? is it important and what are the effects?
another thing I saw this unit (located at the driver side) , which I don't know what is it and also missing a line:


any ideas ?

P.S.- just order the Hynes book for the 450.
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post #5 of 5 (permalink) Old 06-28-2012, 07:51 AM Thread Starter
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Date registered: Jun 2012
Vehicle: 1977 450SLC American model 107.024
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any one please ? /:
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