Originally Posted by
asw7576
in my expirience, 5 to 8 races ... after that, loss of power. After that, idling problem.
Speaking competitively, 5 races only.
is this with the fuel that has 8-9% oils?
Originally Posted by
monsterbrad
this question depends on application and how you are tuning
I ran a .28 sport engine for 2 race seasons before the crank bearing gave out.
Always want to see smoke and don't run the engine too lean
I have had the same engine in my Losi LST which is a 427 Mach ported and polished for more then 4 years now.
About 3.5 gallons or more and it still runs strong
I have been using Odonnells 20 or 30 %
this fuel has always been my choice I have tried a bunch of others but never had any luck
also always keep the air filter fresh
To be honest, i run my engines a little on the rich side just to be safe ... however my performance is compromised
... so running a tad on the rich side as well as running a fuel with more % oils, thats a double negative on performance for me
I am running a .12 OS Speed 12XZ and a .12 OS TZ
I notice that my bottom end is nothing compared to other guys running less oil, however top end, its not that far off ... so if anything i have to accelerate mid-way through a corner to make sure i build up exit speed to try and keep up with the boys running the fuel with less oils in it
But i do notice that with my engine and fuel combo, i barely have to touch the tune ... and after a large bottle of fuel, one of the racers inspected the engine, compression, and looked down the plug hole and said it still looks and feels like a virgin
In comparison, the other guys running fuels with less oils in them, they have to constantly tune their motors due to starting issues, or running issues ... and also, i notice them with new motors every so often while im still on my first motor
Originally Posted by
RayA
In regards to coments of castor synthetic in nitro fuel blend/contents. It does leave a residue on sleeve liner and piston surfaces ,that will of course vary the many blend out there. My observations are with the 100 plus piston and sleeve sets received here each month for reconditioning-resizing services. Of course this residue (to an extent) is the necessary protection, but will also be misleading (when engine cold) the piston + sleeve sealing capabilities effecting engine compression (power) when at operating temp. From the racers end he will see this power loss (especially coming out of corners) and also very noticable change in ideling capabilities. From my end , the removal of this film/residue is essential so as I can reform/restructure sleeve bore + piston (an accurate new designed fit) to suite a nicely "matched" piston and sleeve set. its intriguing when I first pull a piston + sleeve set out of package for inspection and prep as to how normal felt seal with residue still adhered to surfaces, becomes nil / unexceptionable fallowing first clean up. It veries, I see many sets after just a few gallons from onroasd guys( I used to race onroad myself now race offroad) while the offroaders will go (in my opinion with observations) will run much longer before freshining up the seal for optimum performance. Again , as was mentioned a previous post here, it depends on an engines application and racer needs. Bottom line , with the cost of all these little 2cycle nitro engines we want to get the best engine life possible/available to us. Preventative maintenance with a high level care is essential these high maintenance engines. The other alternative is getting caught up in the engine hype and purchasing new engine more often.
I personaly can be concidered more compulsive with bearing changes than resizing my own engines. RayAracing
Thanks for that input Ray ... so in keeping with the best engine life possible motto, do you recommend to run a fuel with more % oils in it?