| Some Chacoal canister facts [message #185974] |
Sun, 30 September 2012 08:58  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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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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| Re: Some Charcoal canister facts [message #186299 is a reply to message #185974] |
Wed, 03 October 2012 11:35  |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| JohnL455 wrote on Sun, 30 September 2012 08:58 |
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:
<snip the info to save bandwidth>
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.
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Yep - a hardly any downside device. The California emissions package had two cannisters in series. If you have the CA package check the hose between the two cannisters. It is a tight path and the hose on mine had a kink in it rendering the system inoperable.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Some Charcoal canister facts [message #186306 is a reply to message #186299] |
Wed, 03 October 2012 13:52 |
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hnielsen2
Messages: 1434
Registered: February 2004
Location: Alpine CA
Karma: 0
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Senior Member |
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Thank You
>
>
> JohnL455 wrote on Sun, 30 September 2012 08:58
>> 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:
>>
>> <snip the info to save bandwidth>
>>
>> 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.
>
>
> Yep - a hardly any downside device. The California emissions package had
> two cannisters in series. If you have the CA package check the hose
> between the two cannisters. It is a tight path and the hose on mine had a
> kink in it rendering the system inoperable.
> --
> Steve Southworth
> 1974 Glacier TZE064V100150 (for workin on)
> 1975 Transmode TZE365V100394 (parts & spares)
> Palmyra WI
> _______________________________________________
> GMCnet mailing list
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