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Old 05-04-2010, 11:34 PM   #16
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Originally Posted by Frank L View Post
Trust me the tank is not 150cc. 140-145 maybe but 140 is closer the actual tank volume.
true frank, at silver state this year, i teched my st-rr witch is what "the-winner" is running...

my tank plus 2 fuel filters (one with no netting) and about 12 inches of fuel line came out to 148cc of fuel.

and i was only 200 grams over the 3000gram wight limit.
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Old 05-05-2010, 03:46 AM   #17
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Quote:
Originally Posted by toobad4u View Post
FWIW, The guy this past weekend doing the measuring at the RC Pro series said 1 inch of fuel tubing is approx. 1ml/cc of fuel. A large fuel filter is around 4-6 ml/cc.

Stephen
Is that so?

The internal diameter of a fueltube is 2mm = 0.2cm
The surface is phi x r^2 = 3.1415 x 0.1 x 0.1 = 0.031415 square cm

To get to 1cc you do need 1/0.031415 = 30 cm of tube.
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Old 05-05-2010, 08:00 AM   #18
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i measure the ST-RR fuel tank with a 50ml syringe( i put 3x50ml) and it is full o fuel...so the st-rr tank is 150ml....
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Old 05-05-2010, 08:08 AM   #19
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You do need something like this to messure it right:

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Old 05-05-2010, 08:23 AM   #20
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where a tank is full of fuel ???
when it goes to overflow ?
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Old 05-05-2010, 08:31 AM   #21
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When there's no air on the tank and the fuel line is full right up to the carb, that is what they measure.
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Old 05-05-2010, 08:32 AM   #22
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Usually they tech after the first round. Just run it then let them tech it. Add fuel tubing to the tank if you are over
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Old 05-05-2010, 11:06 AM   #23
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Quote:
Originally Posted by Roelof View Post
Is that so?

The internal diameter of a fueltube is 2mm = 0.2cm
The surface is phi x r^2 = 3.1415 x 0.1 x 0.1 = 0.031415 square cm

To get to 1cc you do need 1/0.031415 = 30 cm of tube.
I'm sorry, math god, but if you would have read what I wrote. I said "approximately". And you're right, it measures 1.1811023" of fuel tubing. Most people can't cut fuel tubing that accurate anyway.

However, if you are over on your capacity, and use the 1" of fuel tubing with a screw or bolt in each end dropped in your tank, you will achieve reduction of a little over 1ml/cc since will now have to go by the outside diameter, and the actual space the heads of the screws take up.

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Old 05-05-2010, 11:27 AM   #24
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1 inch is just 2.54 cm, 1 inch of tube is calculated arround 0.1cc and not 1cc
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Old 05-05-2010, 11:44 AM   #25
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My bad, I see whta you are saying now. Must have put my decimal in the wrong spot. I'm not used to using the metric system over here.
Okay, so you are saying that we need approx 10" of fuel tubing to equal 1ml/cc of fuel? That seems like a lot of line.

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Old 05-05-2010, 12:28 PM   #26
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Yes, that is it!
I just messured it, with a 60cm fuel line it needs 2cc to fill it up.

I did made a small manual about all the technical inspection tools we use. Regarding the EFRA we have to messure the fueltank up to the carburator and so I was wondering how much difference the length of the fuelline would make so I calculated it and did not find it that important.

By the way, if you can have 2cc extra it is not adviseable to place 60cm of tube, you can get sproblems due the higher resistance in the flow.
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Old 05-05-2010, 12:39 PM   #27
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other way, is to put a truggy tank in a buggy or remove the internal part... by the way, the truggy tank dosent have 155ml and buggy tank have less than 125 ml of fuel....
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