R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Thread Tools Search this Thread
Old 05-17-2011, 01:58 AM   #1
Tech Addict
Join Date: Mar 2010
Location: Christchurch, New Zealand
Posts: 725
Trader Rating: 2 (100%+)
Default Fuel tube lengths?

What is the benefit of running huge amounts of fuel tube like I see some buggys with? Is it purely for an extra bit of run time? Or is there any benefit to it?

I have just run mine straight to the carb with as little tube as possible due to not having much tubing. Should I consider making a few loops for it, or just stick with short and simple?
thorns is offline   Reply With Quote
Old 05-17-2011, 02:04 AM   #2
Tech Apprentice
Join Date: Jan 2009
Posts: 86

you will hear many theories about this, but i believe you should keep fuel lines as short as possible, this increases fuel pressure.
some people run a heap of fuel line to increase the run time upside down but even short amounts of fuel line will keep you running 10-15 seconds if you don't rev the hell out of your engine, hope this helps
Average Joe's RC
HBTRAV is offline   Reply With Quote
Old 05-17-2011, 02:40 AM   #3
Tech Addict
slow coach's Avatar
Join Date: Oct 2003
Location: guernsey C.I.
Posts: 626

you also dont want to much pressure in the fuel line or you run the risk of flame out on re fuelling, when shutting the lid it can force a large charge of fresh fuel into the engine and force a cut.

Tbh there are not huge gains to be had with huge lengths of fuel line and the gains in run time are not massive, it was a long time ago we checked but im sure the length needed to gain 1cc of fuel was probably longer than you would think, run as much as is necessary but try not to keep it really short.

Kyosho MP9TKI2 soon to be TKI3, Novarossi, SMD, GM Racing, www.grccc.org
a great wife and lovely kids
what more can you ask for
a win on the lottery :D
slow coach is offline   Reply With Quote
Old 05-17-2011, 04:48 AM   #4
Tech Elite
Teufel Racing's Avatar
Join Date: Jan 2008
Location: Sparks Nv.
Posts: 2,156
Trader Rating: 28 (100%+)

Mostly the extra fuel line is for when you are on your lid waiting to get marshalled.

With people either running a clunk style tank (Losi and Hot Bodies) or modding a tank to have a clunk, the extra line that people ran isn't needed as much. If you want a little more run time, add in a couple of fuel filters (with the guts removed) to gain some extra fuel. Depending on the filter you can gain 3 to 5 cc's. For club racing you could get away with that, but at larger events adding in the extra filters or fuel line could put you over the max. fuel limit.

If you really feel the need to do either of the above, be sure to check the length of the exhaust line.

My theory is that if you add in a bunch of fuel line or filters, you may need to shorten the exhaust line to compensate for the added fuel line or filters to keep the system in balance. If you run a short fuel line, adding some length to the exhaust line will help to balance the system.

As stated in the first responce, there are many theories and mine is but one. I'm sure that there are plenty of people that could better explain the effects of longer/shorter fuel/exhaust lines.

RB6 - MBX7R Eco
Mugen Seki, Fantom Racing, Cheater Racing
Houston's Engine Service
Teufel Racing is offline   Reply With Quote
Old 05-17-2011, 08:46 AM   #5
Tech Adept
Join Date: Jan 2009
Location: Alexandria,KY.
Posts: 105
Trader Rating: 1 (100%+)

The least amount necessary and make sure the fuel line and pressure line are the same diameter. IMHO the more line you run the more chances you are taking in the long run to get air leaks and then the tuning issues begin.......
Sholler is offline   Reply With Quote
Old 05-18-2011, 01:36 PM   #6
Tech Fanatic
Amoeba's Avatar
Join Date: Nov 2008
Posts: 755
Trader Rating: 2 (100%+)
Send a message via AIM to Amoeba Send a message via MSN to Amoeba Send a message via Yahoo to Amoeba

The caveats others mention above (pressure, clunks, etc) apply but the only thing I can think of that *might* be a reason to run longer lines is to reduce the temp of the fuel going into the engine for longer run times (allegedly). Like a poor man's version of exhaust coolers you see sometimes from pipe to fuel tank.

Whether or not they are functional or if you'll even notice a difference is debatable.
Erin Carroll

Do Not Taunt Happy-Fun Ball
Amoeba is offline   Reply With Quote
Old 05-18-2011, 04:40 PM   #7
Tech Adept
madac's Avatar
Join Date: Apr 2010
Location: Calgary, Alberta
Posts: 229
Trader Rating: 1 (100%+)

I could see a longer fuel line in between the exhaust and the tank so it doesn't heat up the fuel but I run an exhaust cooler to my tank on both my
D8 and D8T and I run a fuel filter in between the tank and the engine as well. I noticed an increase in the performance with the exhaust cooler and my fuel lines are as short as I can get them. I run a little longer from the tank to the fuel filter and then to the engine but I only do that for a clear nicely looped line that decreases a chance of pinching or breaking the lines, I've run the same fuel lines for the past year with no cracks or breaks in the lines but I also keep them clean and blow them out when I can. Works for me.
Team Associated B5
Spektrum DX3S
madac is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Go-Tech Engines Thread MassiveMods Offroad Nitro Engine Forum 15115 12-27-2017 09:30 AM
Manhattan Kansas area Racers and Bashers! buttere Kansas/Missouri Racing 6672 11-26-2017 09:00 AM
Kyosho v-one rrr doki_doki Nitro On-Road 9839 08-07-2014 04:59 PM
Serpent 710 Ron C. Nitro On-Road 23347 03-16-2010 02:47 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

All times are GMT -7. It is currently 05:21 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net