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well so far so good what i did was uniflow mod. not sure what it does or how it works but the savage guys had the same problem and i tried it. but different. what they did is removed the gas tank lid and put a peice of antena tubing in the breather hole in the lid. they cut it long enough to where its 1-2 mm from the bottom of the tank. reinstall the the lid like normal and there you have. i managed to get only 2 solid runs today do to rain. the issue with being too rich on a full tank and being too lean is a thing of the past. i hope. unfortunatly i broke a front lower a arm and could not continue testing but for that short time it ran like a champ
what i did was tuned it at 1/4 tank and then ran it bit to make sure the tune was good. brought it in and filled it up and it ran like a champ it seem a tiny bit rich on top of the tank but not like it was i.e. too rich do to too much pressure.
how i did mine was i took an old revo lid and took it apart. i made the breather hole inside the lid big enough to screw a fuel hose nipple. i then cut a peice of fuel line long enough to get all the way over the baffle and to the corner where the fuel p/u is. i then put the lid back together and reinstalled it as normal making sure the tubing went to the corner. i am going to try it the way the savage guys are doing it with the antena tubing.
some things i noticed after doing this mod. after fueling you need to becarefull as fuel will now go up into the pressure line. once the engine is started the fuel goes back to the tank.
the guys w/ the right turn rich issue or whatever way it is need to try this and let me know if it works.
hey rody if this works for the guys with the turn issues can you hook me up with a freeby should be entitled to a free engine . just think of all head i save ya or atleast some free tshirt
-------------------- T-maxx first gen.; Revo F.O.C. TM323 w/ secrets ; Jato w/ secretes; Factory Team TC3 Ace Hardware Hobbies the best there is Posts: 1 | From: Rota, Spain | Registered: Nov 2005
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posted
i put a schumacher menace tank on my revo and mounted it where the radio gear went by removing the stock radio box then put the rx and battery where the old revo tank went and voila!!!! no more rich/lean issues...revo's tanks and mounting designs are not good for the tm 323.not really sure why but there is something wrong with it..aka 1badgt
-------------------- I did not say it was your fault, I said I was going to blame you.. Posts: 9 | From: flagstaff, arizona | Registered: Nov 2005
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The TM323 has much more power and so needs more fuel, this is the main thing causing these problems to appear. Happy to hear the problem has been solved in this topic.
posted
I'm just curious why it does not happen to all of them... I have NEVER had this issue with my TM323... I even TRIED to get it to do it... no dice. That is a strange phenomenon.
The MGT dual pick-up tank comes stock on that vehicle. One pick-up is at the bottom of the tank and the other is at the top. Both are connected but only one is active at a time. A weighted clunk slides down and valves off the other pick-up so when the vehicle is upright, the bottom pick-up is active. If the vehicle rolls over on its lid, the clunk slides toward the top pick-up (thanks to gravity) and opens the fuel flow from that pick-up while simultaneously shutting off the bottom pick-up. This keeps the engine in fuel at just about any orientation. The pick-ups are both sintered brass which is a nice touch too. Many upgrade their vehicle's stock tank to the MGT tank. Hope that helps.
Posts: 271 | From: USA | Registered: Apr 2003
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I found the major cause of leaning with the tm323 was the pulse effect between piston compressions. With such a tight pinch, the pulses would cause an erratic surge/non-surge of fuel.
The easiest fix was a lengthened piece of fuel line between pipe and tank (I use 8" with an added fuel filter).
The changes were dramatic.. Fuel is forced at an even pulse/pressure throughout the whole tank thus ending leaning issues.
-------------------- Revo - RB TM323, FOC, CR, 16/40, Alum Toe Link, Alum Push Rod, Tan/Green Springs, P2's, Xtreme Graphite Battery Mount, Futaba S9451 Servo, 40 Series Bow Ties/Velocities, Proline Alum Steering Arm, RD Racing Alum Shock Ends, RD Racing Quick Turn. Posts: 3 | From: Sydney, Australia | Registered: Jan 2006
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posted
Downunder - do you mean the 8" is from the tank to the carb? Or Tank to the Pipe? It it's from the tank to the pipe - why the need for a fuel filter since fuel would not flow there? I thought the stock Revo fuel line was 12" long to start with - did you add 8"?
Sorry for all the questions - but I just got the 323 and the engine temp goes up when I'm between 1/2 a tank and a 1/4 tank - is this the leaning issue?
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Ed - it appears this forum is dead. Too bad - not many out there that will answer RB questions as well as I would expect this one to.... patience I guess is in order (and I speak for myself)....
I'm sorry if my comment was a bit harsh - I did not mean for it to be. It just seems like there is not much going on sometimes. I've gotten some answers for some things and not for others. No big deal - I just need to be patient... thanks!!!
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so if you put an airline to the bottom of the tank wont you be making bubbles which will in turn lean the mixture? Is this a stupid question? I really hate this problem, it was too rich at full yesterday for it to run. wouldnt get over 150 degrees till it was below 1/2 tank then got barely 200. mind you it was only 4 degrees celcius
posted
With the airline to the bottom of the tank indeed there will be bubbles, however this will in my opinion not change the fuel-mixture. If you have air-bubbles in the fuel-line then this will lean out your engine. Indeed the leaning out of the engine at 1/2 the tank is not very easy to solve especially in the REVO, however it seems some have found a solition as is explained at the start of this topic.
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