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Model Forum / Radio Controlled / Land Models / May 2004T-Max Run In
Hi Gang, I'm running in a T-Maxx and the engine is doing the strangest thing. I'm following the T-Maxx manual as best I can. I'm into the 5th tank. I have the engine at 4 turns on the HSN as specified in the book. There is copious (HEAPS) of blue smoke. At partial (half or better) throttle the engine has that rich, bogged down feeling, which is fair enough. But at full throttle it has that lean "Sagging" feeling to it, but still with loads of smoke.. Additionally it feels VERY hot and is blowing plugs like crazy. Uneven idling and flaming out after each top speed run. The book warns about strange run in behaviour, but this seems a little over the top - there are symptoms of both rich AND lean, all in the one setting. My only departure from the book is that I'm running 25% fuel. I tried 4.5 turns on the HSN with not much difference. Any suggestions? Mike > I'm running in a T-Maxx and the engine is doing the strangest thing. I'm > following the T-Maxx manual as best I can. I'm into the 5th tank. I have the [quoted text clipped - 9 lines] > My only departure from the book is that I'm running 25% fuel. I tried 4.5 > turns on the HSN with not much difference. Sounds unusual; you'll want to call 888-TRAXXAS after the holiday. Best case scenario would be a loose cooling head bolt or exhaust manifold bolt working loose, causing a massive loss of compression and/or fuel pressure. Snug the bolts and retry. Middle scenario would be busted carb or fuel tank causing air leak. The worst case scenario I can imagine is that part of the piston skirt broke off and is bouncing around, the sharpnel knocking out the GP filaments. The good news is that kind of thing would prolly be a good candidate for wty service. Higher nitro % really will require richening, though I'd imagine the 4.5to on the HSN would have been sufficient. Never tried 25 in a T-Maxx.  SignatureL.V.X., brother mouse http://www.mousetrap.net/otr/ Old Time Radio trades http://makeashorterlink.com/?K16312E06 CBS Radio Mystery Theater database http://greyhound.mousetrap.net/altus/ retired racing dog Go to Traxxas.com and got to the tmaxx forum...Lots of help and advice there! > > I'm running in a T-Maxx and the engine is doing the strangest thing. I'm > > following the T-Maxx manual as best I can. I'm into the 5th tank. I have the [quoted text clipped - 32 lines] > http://makeashorterlink.com/?K16312E06 CBS Radio Mystery Theater database > http://greyhound.mousetrap.net/altus/ retired racing dog Well, After a further play with the truck I have found that I was too lean on the HSN. I am now running it in with just over 5 (yes five!) turns on the HSN and the thing is blowing smoke, running consistently, accelerating sluggishly, idling OK (ish) and not blowing plugs anymore. In other words, pretty much like it should at this stage of its life. I suppose I should have tried this to start with, but 5 turns just seems ridiculous, but there you are, it seems to work. I guess our weather down here in Australia is something outside the scope of the Traxxas manuals. So now I can proceed with the rest of the break in. Just hope I haven't over-cooked the poor thing already .... Mike > Hi Gang, > [quoted text clipped - 14 lines] > Any suggestions? > Mike Thats something that left me scratching my head a few times. Lean HSN and rich LSN. Idles fine w lotsa smoke, bogs & stalls at any application of throttle. Made me nuts. Wasnt on the tmaxx though - that was dialed in perfect from the factory. Sorry i didnt read this sooner, i woulda said something. Dont sweat the damage done. If its ok now, it'll be fine. Just may not last as long as it could have. If you Just cant get her to run right, replace the piston & cyl. Not cheap, but not the end of the world. > Well, > [quoted text clipped - 34 lines] > > Any suggestions? > > Mike try this one http://www.traxxas.com/support/troubleshooting/nitro/tmaxx/trx_trouble_tmaxx .htm > Hi Gang, > [quoted text clipped - 14 lines] > Any suggestions? > Mike |
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