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31 Dec 2000, 00:40 (Ref:55064)
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#1 | |
 Race OfficialVeteran
Join Date: May 1998
Posts: 10,993
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 OK - my question is likely very silly, but i'm gonna ask anyway  In a pitstop there are three things connected to the car - an airline, the fuel nozzle and another pipe of slightly smaller diameter... what is this ? Some form of breather presumably ? If so, is there a reason for it not being incorporated into the fuel hose as in F1 ? |
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31 Dec 2000, 00:47 (Ref:55071)
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#2 | ||
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Veteran
Join Date: Dec 2000
Posts: 1,565
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Perhaps it is to catch the overflow fuel, every ounce counts in CART.
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31 Dec 2000, 00:49 (Ref:55074)
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#3 | ||
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Veteran
Join Date: Dec 2000
Posts: 1,565
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that might also explain what appears to be fuel spray in the general area.
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31 Dec 2000, 00:59 (Ref:55083)
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#4 | ||
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Ten-Tenths Hall of Fame
Veteran
Join Date: Jun 1999
Posts: 12,053
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Im not sure but maybe it is a kind of vaccum cleaner device..to suck the air out of the tamk while the fuel goes in the other end ???
that way the fuel should be able to run faster .. but I could be wrong ??? |
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31 Dec 2000, 01:50 (Ref:55102)
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#5 | ||
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Veteran
Join Date: Oct 1999
Posts: 1,512
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It is indeed a vent pipe. The air that is forced out of the tank by the incoming fuel is heavy with fuel vapour, and is therefore extremely flammable. It is therefore safest to vent this 'air' (fuel vapour) as far as possible from the hot engine and exhaust systems. The vent pipe is clear, so that the refueller can see when liquid fuel starts to emerge from the tank, and so knows that the tank is full. There is no vacuum effect. CART insist on gravity systems only. |
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31 Dec 2000, 01:57 (Ref:55104)
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#6 | |
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Race Official Veteran
Join Date: May 1998
Posts: 10,993
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So how come it's not an 'all-in-one' pipe like in F1 ? Or why isn't the airline and breather made into one piece somehow ? It must be a bugger for one bloke to have to couple and uncouple the airline and breather similtanioulsy - and in the pressure of a pit stop too...
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31 Dec 2000, 02:12 (Ref:55110)
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#7 | ||
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Veteran
Join Date: Oct 1999
Posts: 1,512
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The two systems (F1 and CART) are very different. It has something to with the difference in specific gravity of the Methanol and petrolem fuels used.
I think it's also to see when fuel starts to flow back up the vent pipe. If the vent pipe were attached to the fuel delivery pipe, it would be too difficult for one man to operate. And if the diameter of the vent pipe was reduced to make it more managable, (1) it might not be able to cope with the quantity of air, and (2) the speed with which the fuel would appear and fill the vent pipe may be too quick for the refueller to respond and withdraw. |
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31 Dec 2000, 02:17 (Ref:55111)
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#8 | |
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Race Official Veteran
Join Date: May 1998
Posts: 10,993
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And he's got to be able to withdraw in time, hasn't he...
Thanks for the explanation, Sparky, i'll think of another shortly
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