A mate of mine claims that:

5v3d3b0 · World Chat Champion Joined: 24 Sep 2006 Karma :

Bikes that are carburated have more power with a full tank than with an almost empty tank because of the pressure applied by the petrol causing more to go in.
Sounds like a load of bollocks to me. Anyone agree with him or am I right?

funmonkee · Super Spammer Joined: 27 May 2004 Karma :

carb icing Wink

...seems to be the answer to everything these days
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MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

its bollocks i reckon...
fuel starvation results in spluttering and misfire. do you get that when your low on fuel? no... only when your empty.

unless on his bike, the nitro powder settles to the bottom of the tank so he gets more power Wink

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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green

Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

5v3d3b0 · World Chat Champion Joined: 24 Sep 2006 Karma :

Well I guess he means it'd be running slightly richer...But that's impossible cause then how would you fine tune the carb accurately...
I think the reason it feels faster is cause it's brand new petrol which is colder than the one in the tank, hece more dense, more energy per cc...

MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

where does he get this brand new petrol from? Very Happy

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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green

Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

v8drover · Derestricted Danger Joined: 10 Sep 2007 Karma :

Definatly a load of bollx. Big carb'd bikes have fuel pumps cause gravity/vacuum fed would cause fuel starvation.

wristjob · World Chat Champion Joined: 30 Sep 2005 Karma :

total balls.
a carb works by air sucking the fuel out of the jets,so as long as the float chamber is full the amount in the tank has nothing to do with it.
if fuel pressure is to high you will either get depending on the system)fuel returned to the tank,pissed out onto the road or just massive overfueling with the loss of power that goes with it.

gmanxiii · World Chat Champion Joined: 20 Nov 2006 Karma :

I think it would only start running rich or leaner if theres change in atmospheric pressure. Otherwise the pressure stays the same.

If you have two containers one big one small with exactly the same size put a hole in the bottom. Fill both with water, the flow rate would still be the same regardless of the volume of water.
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5v3d3b0 · World Chat Champion Joined: 24 Sep 2006 Karma :

It's a 125 we're talking about if it makes any difference. I think the petrol being cold does have some credibility though

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5v3d3b0 · World Chat Champion Joined: 24 Sep 2006 Karma :

It's a friend who thinks the volume of petrol counts, and it's me who thinks the TEMPERATURE of the petrol counts.
I'm not like those gayboys who can't stand up for their own beliefs. If I would have thought of his idea I would have stated it

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MarJay · But it's British! Joined: 15 Sep 2003 Karma :

The whole point of a float chamber is to make sure that too much fuel doesn't get to the carbs.

The float chamber is basically a regulator which backs up the regulation which is provided by the jet.

So there is no way more fuel could get into the engine just due to gravity pressure. If that were the case, then the engine would run rich and make less power.

As previously said, the speed at which a liquid flows through a hole in a bowl of water doesn't change if the bowl is full or nearly empty anyway.
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Jack_Cheese · World Chat Champion Joined: 14 Jul 2005 Karma :

By the way, if the ammount of fuel in the tank is affecting his performance, then i suggest he sorts his carb out!
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benvanwell · Nitrous Nuisance Joined: 10 Apr 2007 Karma :

The temperature change will affect the density of fuel; lower temperature means more fuel per unit volume. For a fixed flow rate, and assuming all the fuel was burnt effectively then you could experience a slight power gain at lower temperatures.

The same reasoning applies to "justify" filling up at night. You pay for fuel by volume and when it's colder you get more bang for your buck.
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Walloper · Super Spammer Joined: 24 Feb 2005 Karma :