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Originally Posted by ABN Hoosier
(Post 10869049)
Monty, Neal or anybody. Need a sanity check on something.
I ran my Bonito on my RC8T today. I have the HSN flush, LSN 1/2 turn in from flush, running Byron's 30%, checked my tank and fuel lines (under water) for leaks, I have a zip tie on the carb boot, C6TGC new plug, clean air filter all secured with zip ties, clutch good, use a CompetitionHeat to warm the engine, everything tight. I set the idle and the low speed on the starter box. The engine clears out good and the idle doesn't drop like when its too rich (two stage idle). I run it on the track and run about half a tank and the idle is just way higher when I get off the throttle, like after the long straight. The engine isn't terribly hot, when I checked it was 240 with still good smoke. :flaming: My questions are, is it too lean on the bottom? It seems if I richen the bottom, I have to raise the idle to keep it from stalling and it ends up having the "two stage idle" and everyone says when that happens the LSN is too rich. Just need some advice, thanks in advance. How long is your fuel line ? |
Originally Posted by Maximo
(Post 10869059)
AE tanks can be funny, especially when under hard braking making a right hand turn...wont react as badly on a left hand turn...problem becomes more and more apparent the lower the fuel volume gets,,,,
How long is your fuel line ? |
Originally Posted by ABN Hoosier
(Post 10869077)
I just measured them. Exhaust line is 12 inches and Fuel line is 15 inches. The suggested routing I guess is why they are longer....But that is the length I ran it today on.
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Originally Posted by Maximo
(Post 10869086)
15 inches is IMHO too long for consistent fuel supply...i suggest running as short of a line as possible..... We recently had a few guys having issues like this, ended up being the fuel line was too long and was causing trouble with the fuel supply..........
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Neal, quick question. I checked my tank and it is not leaking. I submerged it underwater and capped off the fuel inlet and blew into the exhaust inlet line which is located on the fuel cap on the AE tank. No bubbles, no leaks.
I OFTEN saw little airbubbles in my fuel line while it was mounted on the truggy. I am guessing that it was from the exhaust inlet. I am certain that this is effecting how my engine runs. The fuel inlet nipple eats a steady flow of these lil bastards........:flaming: So, I wonder if shortening the fuel line is a possible solution because at idle there is a considerable decrease in fuel pressure and the shorter fuel line has less volume......WHY IN THE HECK DONT TEAM ASSOCIATED TELL PEOPLE THIS? No, but seriously...I ran it straight from the fuel out nipple to the carb inlet nipple with like 2 inches of fuel line. We'll see....:confused: |
Dude I was having the EXACT same issues this weekend in my Agama buggy. I was thinking my fuel tank went bad....cause car was fantastic for practice and Rd. 1 & 2. But after that and into the A-main I had a terrible low speed bog.
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close to 8" on pressure line and fuel line is close to optimal for most all cars , shorter fuel line will cause you to die very quickly if upside down , HIGHLY recommend running inline fuel filters at all times , ones in the tank not enough , proved it over and over , no need for any longer fuel line than this especially with good fuel filters , i havent seen any issues with fuel line being too long but it is unnecessary .
particulates will still blow by in tank filter and get stuck in hsn (especially novarossi) and wreak havoc on your tunability and the ability for fuel to flow freely when a load/suction is posed on the fuel system . abnhoosier tip: find the point where the engine just starts to have for 2-3 sec that "RICH" idle effect then drops to a consistent idle , that is where you know it is close to the right point , thats where it all wants to work right . remember when fine tuning your novarossi carburetor that very small 1-2 hr adjustments are made ;) |
a lot of people dont realize that your fuel delivery and back pressure lines have an affect on the tuning characteristics of your engine. As Houston said, 8-10" is ideal for both lines. too short on either or both lines can give too strong of a fuel signal to the carb and effectively force fuel into it giving a false rich condition. too long and the signal is weak causing a false lean condition. In either instance these conditions will be inconsistent, with it being fine sometimes and lean or rich other times.
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Originally Posted by megasaxon
(Post 10870261)
a lot of people dont realize that your fuel delivery and back pressure lines have an affect on the tuning characteristics of your engine. As Houston said, 8-10" is ideal for both lines. too short on either or both lines can give too strong of a fuel signal to the carb and effectively force fuel into it giving a false rich condition. too long and the signal is weak causing a false lean condition. In either instance these conditions will be inconsistent, with it being fine sometimes and lean or rich other times.
http://i1137.photobucket.com/albums/...r/fuelline.jpg I took Neal and Monty's advice and reconfigured the Fuel line length and routing and brought it down to 8". It made a Night and Day difference. I really started to doubt my tuning skills and I really got frustrated with it. Now who woulda thought a "few inches" would make such a difference. "Thats what she said" :lol: Here's the new fuel line set-up I went with. I just CA'd a few fuel line clips to the tank. I did this to my RC8T and RC8.2. Thank you Gentlemen, and Happy Fathers Day to ya :) http://i1137.photobucket.com/albums/...r/IMAG0038.jpg |
What are you using to hold the pressure line down? (keeping it out of the flywheel/clutchbell)
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How important is the "diameter" of fuel line? I use the Dubro Large (p/n 204 in 30ft. rolls) and have usually had good luck. However the previous two races I've had a bog issue in buggy or truggy but never both classes.
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Originally Posted by air8
(Post 10870845)
What are you using to hold the pressure line down? (keeping it out of the flywheel/clutchbell)
http://i1137.photobucket.com/albums/...oosier/pic.jpg |
Be careful not to make that bend in your fuel line too tight ABN, that can cause it to pinch.
I presonally like running smaller diameter line that the stuff that comes in kits like Losi or serpent. Much more consistent idling and engine performance. What fuel filters do you like to run Monty? |
I always run Dubro Nitro Line, comes in various colors, for a long time i was just using the translucent blue to be able to see the fuel in the line(to check for bubbles) but i replace it often enough that i run the colored(yellow) line now and not worry about it.
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Originally Posted by Muggydude
(Post 10871395)
Be careful not to make that bend in your fuel line too tight ABN, that can cause it to pinch.
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