posted
We have just purchased 2 RB TM 323 engines. We both have them broken in as to trx break in methods and they have ran fine until we started actually seeing what they would do. When taking a left corner it stalls itself out and drains the fuel line as soon as the fuel gets back to the carb it will idle and run fine in a straight line, and it hauls a$$. When I take a right corner it also starts to die due to excessive rich condition. I have tried a new o-ring on tank, I have tried a brand new tank, different lengths of fuel line, different loops etc. I have tried everything that has been outlined by another member on here. I work with exhaust on vehicles everyday and thought that if I squeezed the outlet of the pipe....the blue deflector....off a bit with a ziptie it would create more back pressure, which it did. The engine ran with less of these issues but they were still noticeable. Anyone have any ideas? Is it possible to put a one way check valve or a fuel pump on this engine? We are using Sidewinder Backyard Basher 20% fuel. tired traxxas 3231,3232, and stock rb plug and all the same outcome. Thanks for any help with this Parker
[ 29. August 2005, 02:30: Message edited by: Parker ]
Posts: 11 | From: Nova Scotia, Canada | Registered: Aug 2005
| IP: Logged
posted
Rody, I have installed a fuel filter as you instructed me to do. It made a bit of difference, it will recover itself after a left hand turn if you let it sit for a minute. However a high speed left it will still die. I also tried a check valve on the exhaust side of the tank and the fuel side of the tank and it made no difference in this problem. I still cannot turn left with out it dying or right without major richening. Is there any other suggestions you can give me to remedy this problem as we have our first race coming up in the near weeks ahead. Thanks Parker
Posts: 11 | From: Nova Scotia, Canada | Registered: Aug 2005
| IP: Logged
posted
the filter is a dubro medium filter. It is mounted within 1/2 inch from the carb, with a 45 dgree angle towards the front of the truck to make it slightly forward of the carb. It is the same height. I tried a couple different loop designs however they made no difference. Any other details you need just lemme know. Any other suggestions would be greatly appreciated Thanks Parker
Posts: 11 | From: Nova Scotia, Canada | Registered: Aug 2005
| IP: Logged
posted
I will try and mount the tank infront of the engine. On another note sir, I noticed that when I open the throttle while tryin to start the engine it sucks the fuel back into the tank, I am not a top notch rc mechanic nor do I claim to be, but is this normal on this engine? Thanks Parker
Posts: 11 | From: Nova Scotia, Canada | Registered: Aug 2005
| IP: Logged
posted
The carburetor of this engines are quite big so it needs the pressure of the pipe to get enough fuel going to the engine. This also probably happens because the fuel level is lower then the carburetor itself.
posted
A local racer was having the same issues running a 2.5r in his revo. It wasn't until he changed the tank style that the problem went away. He went to an ofna 1/8 buggy tank.
Mike
Posts: 8 | From: Nova Scotia, Canada | Registered: Oct 2005
| IP: Logged
posted
Just a thought...how have you guys got your fuel lines routed, as per original revo style or a shorter fuel line??? Perhaps puttin the coil of fuel line in front of the engine might help here. Just a thought !!
-------------------- Too much speed is never enough Posts: 13 | From: Perth, Western Australia | Registered: Sep 2005
| IP: Logged
posted
Rody tried everything all so diffrent tank fuel line even put the tank more forward between the roll bar and receiver just cant solve the problem how far forward has the tank got to be? On the verge of giving up
Posts: 4 | From: UK | Registered: Jun 2007
| IP: Logged
posted
search my threads I have tons of pics of my set up and have fixed the issue.
PS adjust your fuel tube and pressure tube length.
A longer fuel tube takes more pressure and a longer amount of time to push fuel to the carb so that could be one issue you have. Shorten your fuel tube and make your pressure line about 6inch or a bit less so it will pressure the tank and push fuel the carb quicker.
I had 2ft fuel line and had lean issues with excessive full lock turns but now its gone.
I also have a fuel filter mounted on the upper loop that feeds the carb so that it basically drops fuel downward to the carb from being mounted on the top loop.
Posts: 140 | From: Redlands | Registered: Oct 2006
| IP: Logged
posted
I have fitted a check valve in the pressure line. this stops fuel getting pushed back into the pressure line and has greatly reduced the lean left problem without relocating tank. note if you're doing a lot of tight circle work it will still lean and die after about 6 donuts lol
-------------------- REVO TM523 Spektrum DX3 every thing else is stock, for now.... Posts: 10 | From: Perth Western Australia | Registered: Jun 2007
| IP: Logged
posted
just got my Mugen MBX5T fuel tank and put more fuel line on and has made it alittle diffrence but still dieing on left hand lean thats it ive tried everything lol nowt is working
Posts: 4 | From: UK | Registered: Jun 2007
| IP: Logged
posted
I have now fitted a fuel filter as well ( Anderson deluxe for aircraft holds about 2cc of fuel) and the lean left right rich problem is almost nonexistent now. filter is in front of engine and inside roll bar of revo, arranged so lines didn't kink otherwise i used standard fuel line routing and shortened line as much as i could without kinking. You can hear that the engine does lean a little on left turns but it doesn't die. On right turns I can't hear or feel the difference in the engine.
[ 08. July 2007, 04:31: Message edited by: ScudsREVO ]
-------------------- REVO TM523 Spektrum DX3 every thing else is stock, for now.... Posts: 10 | From: Perth Western Australia | Registered: Jun 2007
| IP: Logged
posted
Hiya Brian 1979. Thanks for the info dude, sounds like what your saying is that the truck needs a swirlpot/surgetank just like full size drag race cars/high performance cars use. This little tank holds a volume of fuel so whenever the throttle is mashed and the two 1050 Barry Grants (ProStock drag cars use these on their 1000+hp na V8's)need maximum fuel it is available.
I guess the 323/523 is a high performance engine and does need a lot of fuel when accelerating, if you so happen to be cornering at that precise moment then she gonna cop a big dose of fuel. The swirlpot (gutted large fuel filter) would act as the reservoir of fuel without it being able to be pumped into the engine by G forces when cornering hard right or draining the carburettor when turning left.
I am interested in a 99.99% sure cure for the woes that the RB powered REVO's seem to have, because i have a new in box RB 323TM ready to go into my REVO when the 3.3 cries enough (really soon) and i want this thing to go hard without the little nagging problems that have plagued so many.
Hows does the idea of a small fuel bulb sound attached nearby the carby while still using the stock tank? Brian.
Twin
-------------------- Too much speed is never enough Posts: 13 | From: Perth, Western Australia | Registered: Sep 2005
| IP: Logged
posted
Actually I didnt gut my filter I left the screen in it and still have no problems. I really think it has more to do with the fuel and pressure line lengths.
You will have to try the stock tank out and see what happens but that Mugen tank has baffles around the pickup that keep the fuel from moving too much. This may help but it has more to do with having enough pressure going to the tank to drive fuel to the carb.
Too long of fuel line means it takes more time for the same amount of pressure in the tank to push fuel to the carb. SHorten it up and it will get to the carb faster from what I can tell.
Posts: 140 | From: Redlands | Registered: Oct 2006
| IP: Logged
posted
There are tons of pics in the link I put above, enjoy and ask questions if you wish.
Only thing different is shorten the fuel lines from some of the early pics. Also I dont have that coil of line just before the carb any more. Its a good thing to try but I didnt end up needing it.
I havent ran tight left circles for minutes on end in a while but I suppose I could do it long enough and fast enough to get the engine to die if I tried hard. I dont have any half tank lean issues or any thing like that and under normal track conditions no issues at all.
UBBFriend: Email this page to someone!
![[Smile]](smile.gif)
