posted
Hey guy's, I just got an RB 323, and I realise this is for 21's but this seems to be where the answers are and I seem to have a very unusual problem, so here goes.
Posts: 15 | Registered: Aug 2005
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posted
wow..don't hit enter till your all done...got it. So my problem is that when I turn left, my engine lean bogs, and vice-versa, when going right it loads up. Now. I have a brand new fuel tank , and lines, both have been checked, and rechecked since I installed the RB a couple of days ago, this tank preformed flawlessly just earlier the same day with my old engine. I've tried several differant fuel line lengths, and set ups ie involving loops to try and counteract the force of gravity pulling fuel away from the carb ( for anyone who's not familier with the Revo, the engine is on the left, tank on the right... At idle if I pick the truck up and tilt it from side to side I get the same problem, just not soo pronounced at idle. When I got the engine, the nut on the HSN was loose to the point to when I installed the fuel line to the carb, the nipple was wiggling around, I've tightened that, and other than that the engine doesn't seem to leak anywhere ecxept for when I took it out, plugged the carb with my thumb and blew in it, I had air escaping from the carb boot. In a straight line the engine seems to run just fine. I run 20% side winder and an OS A-5. Today I will be starting it and warming it at idle then taking the fuel tank off and holding it in my hand I will independantly tip the tank, and the truck ( engine ) to positively eliminate one or the other, but if anyone has ever had a similiar problem I'd love to hear some suggestions...For anyone who bothered to read this far, THANK YOU.. ...P.S. for Rody, I've run it by my LHS where I got it and there scratching there heads aswell.
Posts: 15 | Registered: Aug 2005
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posted
Well. I think I ruled out the fuel system completely..I installed another tank and still I'm having the same problem.
Posts: 15 | Registered: Aug 2005
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Since I put it in,,Friday, so, 4 days. it wasn't very notable the first day cause I was breaking it in and not " on it " or cornering hard. The next morning tank 9 I was putting it down a bit harder to see what I had here, and then it was clear that I had a problem.
Posts: 15 | Registered: Aug 2005
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posted
what pipe are you using is there enough pressure going into the tank? check that you have no air leaks and toss the os glowplug,stick with the rb plugs. os plugs are no good for rb engines.make sure that your head screws are all tight and that the carb is seated properly and that your air filter is clean and properly oiled.this could be just breakin issues and might go away once the engine is completely broke in. sometimes engines do strange things while they breakin.
posted
First of all I moved the topic into the right forum...
Indeed it is normal that there is a difference in tune for the engine with what you have described, for the simple reason that the tank is situated on the side of your engine and so if you make a left turn the engine will lean out due to the gravity of the fuel increasing and the oposite when you make a right turn. The faster you will make the turn the worse this phenomene can become.
You can try and fix this by making some horizontal loops in your fuel-line to the carburetor and see if this improves the situation.
posted
Rody? But doesnt the fuel tank work with the pressure that comes from the pipe? So what does it matter if you are going left or right or even upside down? I think its a pressure issue.Bad seal maybe?
Posts: 23 | From: Kingston, Ontario | Registered: Aug 2005
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posted
I use the stock pipe. I was using the stock RB plug and the problem was the same. I have tried more than 5 differant variations of fuel line lay out, including horizontal and vertical loops. I did notice a very fine misting of oil aroung the bottom of the head, but this engine uses straight edge screws (oddly enough ) as head screws, and they are as tight as I can get them. I have had to snug down the retaining bolt on the HSN several times now, and I'm thinking that is a likely culprit. How tight should that nut be.. the banjo fitting the fuel line attaches to is plastic and I'm worried about crushing it. Does anyone know of a metal one I might try in it's place ?? My carb seems to be planted perfectly, and I'm as on top of airfilter maintenance as anyone I know. Roost, and Rody, I hope this doesn't sound as though I'm just trying to shoot down your suggestions, just the opposite I appreciate them very much. It's just that after 2 fuel tanks, and half a dozen fuel line configurations, and having pressure and leak testing them all repeatedly I just can't see it being an external fuel delivery problem. I will however remove the head completely and check the shim for any damage, clean things up and re-install it as tight as I can. I'm also going to try to seal up that HSN somehow and mabey thread lock it to it won't keep backing out. I agree with Portyansky that it must be a sealing issue, only I'm thinking at this point that it must be in the engine. As I mentioned earlier, when I remove the engine and attach some fuel line, cover the carb with my thumb and blow my brains out, the only leak I was able to find with a cotton swap dowsed in water with a bit of dish soap was from the carb boot. This was a considerable leak however, and it may have been allieviating internal pressure as fast as I could generate it, so there may yet be a leak I'm un aware of. Is the carb boot laeking that much usual, I know that that is the opposite pressure that would be generated by an opperating engine, and after I found it I idled the engine while spraying WD on the carb and could hear nothing out of the ordinary. Well,, another long post here sorry.. thx for your time guy's. A little bit of good news, in a straight line this thing RIPS. Hands down out muscling my old 18 TM. Even on the highest bite surface I could find, acceleration in a straight line requires throttle management. I know this engine's got ton's of potential, and I may yet get lucky and it'll continue breaking in it'l clear up.... Well.....
Posts: 15 | Registered: Aug 2005
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Well.. this isn't going away. And no one seems to have any clue what is causing it. I went to the races tonight to see some of the more experienced tuners and no one has a clue. 20 guy's a couple of RB sedan runners, and a lot of communa;l head scratching, no progress. I've taken the tank out of the vehicl and rotated it independantly and determined 100% that the problem is internal in the engine, so I'll be taking it back to the LHS tomorrow to be sent out. So Rody, how does that work, do they need to send it to there distributer ?? or you ?. Is it typacally a lengthy down time ?.. Any ball park would help me decide what direction to go in from here.. thx
Posts: 15 | Registered: Aug 2005
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posted
Normally your LHS should be able to solve this problem, if they cannot find it then your LHS needs to contact our distributor and it will go from there.
I honestly do not think it is related to the engine because in my experience it is a problem of the position of the tank in the REVO. When you try to make speed turns with the REVO left or right you will always have a difference in tune, even when you do this with the original TRX engine.
Anyway, feel free to contact your LHS and see what he can propose to you.
posted
I understand what you mean on that one. However, like I mentioned , removing the tank from the Revo and tipping just the tank and lines from side to side would not generate this problem. I was then able to hold the tank and fuel line perfectly horizontal, and tip the Revo with only the RB in it from side to side, and when on it's right side, the RB would lean out and rev up, and when on it's left side the RB would load up and stall. I believe that experiment eleminates all but the RB...
Posts: 15 | Registered: Aug 2005
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Keep all else the same I will re install my 18 this afternoon, and repeat that last experiment. I'll post my findings for you.
Posts: 15 | Registered: Aug 2005
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posted
Hey you should have let me fart around with it last night. Also i pmd you
Posts: 23 | From: Kingston, Ontario | Registered: Aug 2005
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posted
I wonder if we could put a fuel filter in line to hoold alittle extra fuel. That might be just enough extra fuel already in the lines to keep t he truck in fuel while under hard acceleration or hard cornering? Mine starts to cut out if i do a couple of high speed passes back to back.
Posts: 7 | From: kansas | Registered: Aug 2005
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