the two holes you see on race cars (eg JGTC)

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Alex.

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can anyone tell me what those two holes are you get on race cars sometimes? there's two on the back of the castrol tom's supra and two on this clk gtr! can anyone shedsome light on the subject? most JGTC cars seem to have them

 
Thats for the racing fuel filler, one hole is fuel supply and the other hole air breather, so they can fill quicker without building pressure in the tank. Both hoses used by the filler is in one unit.
 
They're for the fuel. One of the holes is for the fuel to go in and the other is the vent, to let the air out of the fuel tank.

fuelsupergt.JPG


edit: Beaten, but at least I had a pic! :P

edit2: They're on the bonnet of this Porsche.

fuelporsche.JPG
 
Often the cars have a set on each side of the car, so that it doesn't matter what side of the track the pit lane is on, for example, at Laguna Seca the pit lane is on the left, so they would fill the car from the left, at Silverstone it's on the right, so they fill from the right. It saves time.
 
You know what's truly funny? Some guy had a riced-out car on Ebay, where he had actually re-routed the exhaust pipes to run up through the trunk pan and out through the back of the decklid...

...because he had seen pictures of them but had no idea what they actually were, and didn't think to do a little research before doing all that bodywork.

On the fuel fillers, the upper one is actually a return line, so that they capture any overspray or vapors that might spew out of the tank during filling. This was mandated after a series of pit lane fires in the late '80s/early '90s.
 
500_02_earnhardt.jpg


On the NASCAR models they are used as air inlets to cool the driver while racing...
 
They're not what he was talking about though. Most race cars have an inlet in the window to allow cool air into the car, that NASCAR's fuel filler is just further back on the side of the car.
 
Yes, I know. When I first read the whole topic, the NASCAR situation was the first thing that poped into my head. The NASCAR fuels up right there behind the "Goodwrench" sticker and has the catch can on the back of the car next to the small blue "GM" sticker.
 
AFAIK the fuel filler in F1 is a tube within a tube. The fuel goes in the inner one and air goes out the outer one, but it looks like one hose from the outside.

Unless you're BAR. Then the air goes into another tank inside the car and they use it for ballast.
 
daan
AFAIK the fuel filler in F1 is a tube within a tube. The fuel goes in the inner one and air goes out the outer one, but it looks like one hose from the outside.

Unless you're BAR. Then the air goes into another tank inside the car and they use it for ballast.
Yep, this is what happen when you do it wrong:

 
They're speedholes, they make the car go faster. You can make 'em yourself with a pick axe.

Unless you're BAR. Then the air goes into another tank inside the car and they use it for ballast.
Couldn't let BAR enjoy thier glory for too long, now can we?
 
If there's something that seems have become very apparent recently in racing, it seems you actually have to have a lot strength to handle the pump.

I've noticed how sometimes the 2 guys refueling usually have flexing arms to hold the pump in. So due to this, I take it the pump is actually held in place, not locked/unlocked when done?
 
*McLaren*
If there's something that seems have become very apparent recently in racing, it seems you actually have to have a lot strength to handle the pump.

I've noticed how sometimes the 2 guys refueling usually have flexing arms to hold the pump in. So due to this, I take it the pump is actually held in place, not locked/unlocked when done?

Quite often you find someone had a poor pitstop because the fuel filler got stuck. They might spigot but not physically lock, when refueling you want as much fuel as possible and dont want it pissing out everywhere.

The straining arms are probably due to the heavy pipe and the force of pushing 50 odd litres of fuel in less then 10 seconds.
 
Slick Rick
what about F1 cars, how is the air released when their filling up??


I thought F1 cars use a fuel cell. The cell shrinks as the fuel is used so there should be no air in it.

They do this as a half full tank of fuel would slosh about in the high G corners and compromise the stability of the car.
 
CCX
but was that video real? and was the driver ok?

Yes, the F1 video above is real. Jos Verstappen at the 1994 German GP. No-one was seriously injured.

edit: Bit late, I was reading another topic after I opened this so I didn't see your reply daan.
 
Yeah it's an awful place for the filler on that Boxster isn't it.
 
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