XRAY - Model racing cars

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 Post subject: Fuel Tank size
PostPosted: Tue Mar 25, 2008 02:04:03 
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Joined: Tue Jul 24, 2007 06:07:49
Posts: 9
Location: Bunbury Western Australia
I am curently prepairing for a couple of big races and decided to start checking wing heights and tank size ETC. Well the tank size surprised me.
No insert, 100mm fuel line = 64ml fuel. To get the required limit of 75ml I have to use 250ml of fuel line and a large fuel filter and its still only 73ml.
Has any body else found this and how did you solve the problem ? :o

thanks :)


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 Post subject: Re: Fuel Tank size
PostPosted: Tue Mar 25, 2008 02:23:36 
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Joined: Thu Feb 28, 2008 09:04:32
Posts: 20
Location: australia
advfuel wrote:
I am curently prepairing for a couple of big races and decided to start checking wing heights and tank size ETC. Well the tank size surprised me.
No insert, 100mm fuel line = 64ml fuel. To get the required limit of 75ml I have to use 250ml of fuel line and a large fuel filter and its still only 73ml.
Has any body else found this and how did you solve the problem ? :o

thanks :)


not sure if your numbers are wrong, but mine was under by about 5 ml, i had to add a pressure chamber and some extra fuel tubing to get it to size.

leave some fuel in it overnight and it will expand a bit


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 Post subject: Re: Fuel Tank size
PostPosted: Tue Mar 25, 2008 02:34:17 
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Joined: Tue Jul 24, 2007 06:07:49
Posts: 9
Location: Bunbury Western Australia
tomb wrote:
advfuel wrote:
I am curently prepairing for a couple of big races and decided to start checking wing heights and tank size ETC. Well the tank size surprised me.
No insert, 100mm fuel line = 64ml fuel. To get the required limit of 75ml I have to use 250ml of fuel line and a large fuel filter and its still only 73ml.
Has any body else found this and how did you solve the problem ? :o

thanks :)


not sure if your numbers are wrong, but mine was under by about 5 ml, i had to add a pressure chamber and some extra fuel tubing to get it to size.

leave some fuel in it overnight and it will expand a bit



Thanks TomB I checked about 4 times as I thought I was doing something wrong. They are the right numbers this is a new tank so I might check my old one as well, just to double check


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 Post subject:
PostPosted: Tue Mar 25, 2008 08:59:33 
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Joined: Sat Oct 23, 2004 08:22:54
Posts: 897
Location: Holland
I have been to some big events and can tell you a lot of people with all kind of brands are heating up the tank to bend the sidewalls more to the outside to get the right volume.


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 Post subject:
PostPosted: Tue Mar 25, 2008 11:45:04 
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Joined: Tue Jul 24, 2007 06:07:49
Posts: 9
Location: Bunbury Western Australia
I have checked my old tank and it measures 73ml more realistic. :shock:


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 Post subject:
PostPosted: Wed Mar 26, 2008 13:12:57 
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Joined: Wed Oct 27, 2004 12:37:09
Posts: 183
At the EC-B (25 degrees celcius) when the Xray was just out (so first batch of tanks i gues). I was oversized with a 70mm fual tank, got 78ml...


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 Post subject:
PostPosted: Wed Mar 26, 2008 14:17:43 
my tank was 76ml i had to put in the extra piece to make it legal at 75ml


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 Post subject:
PostPosted: Fri Mar 28, 2008 10:36:52 
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Joined: Tue Dec 04, 2007 12:43:50
Posts: 1
Location: sydney, australia
my tank was also 76ml so i installed the insert aswell


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 Post subject:
PostPosted: Sun Mar 30, 2008 12:31:18 
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Joined: Tue Oct 09, 2007 11:06:02
Posts: 88
Location: dardanup west australia
i have 2 tanks one at 75 ml the other 72ml :D


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 Post subject:
PostPosted: Mon Apr 07, 2008 10:41:17 
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Joined: Fri Sep 03, 2004 11:22:56
Posts: 2497
Location: Trencin, Slovakia
The fuel tank size may vary from piece to piece slightly due the manufacturing process of moulding and glueing the tank together. Also remember that after your run depending on the weather and other conditions your fuel tank capacity increases. For this reason before any race make sure to go to tech inspection to check your size before and after a test run to know your current fuel tank capacity and I suggest you rather go slightly below the limit (use the fuel tank insert to decrease capacity) than to risk you will be disqualified after you set TQ :D


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