| Some Chacoal canister facts [message #185974] |
Sun, 30 September 2012 08:58  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
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I found my old Doug Roe Rochester carb book. This topic came up at the fuel seminar and I thought I would retype some info:
"Depending on car size, the canister contains either 300 or 625 grams of activated charcoal (carbon) in granules of .033 to .094 inch in diameter. Each gram of charcoal can hold up to 35% of its weight in fuel vapor. This is because each gram offers a surface area of over 1100 square meters-over 1/4 acre! Thus the 625 gram units have an internal surface area equivalent to 170 acres (165 football fields)! The fuel vapor molecules are adsorbed (condensed and held) onto the surface of the charcoal. Adsorbtion is a process with a very weak attaching force so the fuel vapor molecules are easily dislodged by flowing fresh air through the charcoal bed during the purge cycles."
I would think we have the larger 625 G units as the 300 would be reserved for 4 and 6 cyl cars. Ahhh to have worked at Rochester labs in the day.
John Lebetski
Woodstock, IL
77 Eleganza II
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