Dec 31, 2002, 02:02 AM
Mr R. Laramee
Re: Nearly another 'how to tune my engine' question
tempestnightmare is on the money, id say the sleeve is gone needs a rebuild
"TempestNightmare" <firstname.lastname@example.org> wrote in message
> The clacking sound makes me think either the piston and sleeve are worn,
> the con rod is trashed.......
> "free.teranews.com" <%email@example.com> wrote in message
> > Hi all,
> > I really need some advice on this.
> > I have 3 Traxxas nitro cars, a Rustler, 4TEC and of course the TMAXX.
> > have the TRX 0.15 engine in them.
> > The Rustler runs great - very fast very powerful - it is also the oldest
> > 3 years old...
> > The 4TEC is not bad - but seems to have (and always has had) huge
> > compression compared to the other two - once running it tunes in and
> > very well, it is just a bit of a pig to start sometimes.
> > The TMAXX though is odd. When I first got it (about 9 months ago) I
> > run it all day with no problems at all, I would have said it was the
> > the 3.
> > It now starts very easily and will run quite well for about 5 minutes.
> > then starts to sound as though it is running hot (clacking sound, uneven
> > tickover) and the water drop test suggests that it really might be a bit
> > hot. To compensate for this I richen the mixture (top end) and
> > makes a difference to the power, but does not seem to cool the engine
> > and I still have the uneven running at tickover. I have tried adjusting
> > bottom end mixture instead and all I do is get a truck that will stall
> > accelerate too hard and is still hot. The basics of this problem are if
> > set it rich enough to keep cool the thing has no power and splutters
> > mad.
> > The driving I do is a mixture of high speed and low speed - not that
> > seems to change the symptoms.
> > All the engines were run in the same and exactly as per the
> > So far I have done/ checked for...
> > Dirt in the fuel line
> > Dirt in the carburettor (disassembled and cleaned)
> > Damage to the mixture needles
> > Dirt / damage in the engine (not disassembled - just looked for score
> > on the piston and crank)
> > Ensure the air filter is clean
> > Leaks in the fuel line etc
> > Binding gear train
> > Binding clutch (at tickover)
> > Avoiding driving on grass (not that I have done this much anyway)
> > Reset to factory tuning settings and start again
> > I use 20% blue thunder fuel in all the cars and wonder if fuel is
> > contributing to the problem (not that I have had any problems before),
> > why would it work in the other 2 cars?
> > Sorry to post another subject on 'how do I tune my engine' but I am
> > very frustrated with this now.
> > Please, please help me with this, it is spoiling my fun!!
> > Thanks
> > Garry