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Old 04-05-2007, 10:11 PM
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300SD81 300SD81 is offline
1981 Mercedes-Benz 300SD
 
Join Date: Aug 2006
Location: University of Georgia
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Quote:
Originally Posted by Scott98 View Post
I just pulled a "test" vacuum and I can only pull the system down to about 22HG. Is that enough? I thought you really need to be at around 29HG?
How many psi are you running through it? I got my pump to do 29hg of vac, but I had to turn the thing up to 100+psi.. 22 is not enough


Heres a calculator for the boiling points of water at different vacuums..

http://www.partyman.se/calculator.html

You have to convert inHg to mmHg and then subtract from 760mmHg (atmospheric pressure) to get the absolute pressure in mmHg
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Ich liebe meine Autos!

1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete
1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday...
1981 Mercedes-Benz 300SD | Rear ended, retired in garage.
2009 Yamaha AR230HO | Das Boot

Excessive speeding? It ain't excessive till I redline!

Last edited by 300SD81; 04-05-2007 at 10:17 PM.
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