hvymetalalchmst
RCTalk Champion
this is my first post. there are lots of problems (some which may seem obvious, but to me seem far from it) and I'm on the verge of absolutely obliterating my rc truggy
first of all; i own a sinyih truggy, about 5 years old, 1/8 4WD w/ 3 diffs, 3.5cc force engine, and cost me about AU$800 then. i only run on 10% nitro (its my personal preference). i got my LHS to build it for me, which i think is the stupidest thing I've done yet.
i think i need to detail everything because I'm not going anywhere soon
Ever since i got it home, nothing has ever been right. in the first six months, i did very rare weekend runs. storage for the next 12-24 months, tried it a few times, gave up, and back to storage. every 12-or so months i tried to get it started.
please note that i store it in a cool, dry garage free from anything bad, although i dont use afterrun oil. i dont store fuel in the fuel tank.
during the first year, i could barely get the damn thing started; it often flooded, and could not tune it. i think it was partly (not completely) my fault.
when the thing ran, with the occasional flood and unstartable fits, the truggy would randomly (and i mean randomly) run dead max speed, and veer left; it smashed into trees and fences a few time, pretty badly. thats when storage started. turns out my transmitters potentiometer (variable resistor connected to the throttle control) was set to much on one side, and hence would 'half-short'. I've since fixed that.
my glowplug has already had one untimely death (after only about 6L [2 gallons] of fuel). i did not have a label or reference number, but my LHS gave me a OS A5 plug (medium cool). i have always had trouble tuning the truggy, with both plugs, i think its due to inexperience. i can easily tune anything, that is, anything but this!
just lately I've tried to get it started, again. the problem is that it runs. but i think that the LSN has problems, when the pinch test works, it struggles up inclines from stationary, spraying lots of smoke. it feels weak and sounds as if its too rich, though leaning does no good for the engine. when i accelerate; ie from stationary-to-half throttle instantly, the thing kills itself. when i slowly accelerate, it seems to struggle, kind of pulsing, though does not pick itself back up. whenever i lean the engine, it easily kills in acceleration. it looks and sounds good off ground; i like a little richer mixture for open areas (i dont tune off ground, its just an observation). richening it seems to make problems worse. leaning makes it have epileptic fits. oh and when the piston is on the top of its stroke, i can hear some small air leak, but is a very, very faint sound (is it normal??!?!?!)
the engine now does not keep alive. i use a starter box instead of pulling now. and does not keep life as soon as the glowplug warmer is removed, about after 3 seconds. even idling higher cannot save it. to keep it alive, i rev it a bit whilst taking it out. the glowplug is an OS A5.
i have taken the engine apart before. it has no shims; just the block, glowplug-block thingy and heatsink. now it seems that fuel or something is leaking or is wetting the side of the engine block, and the silicon seal between the header and exhaust opening is leaking oil (i hope they are related). the fuel line seems to sometimes randomly pressurize, and requires screwing the HSN in then back out to relieve pressure to prime. just a few hours ago, there was a pressure build up again, and the engine flooded; i mean flooded with pretty much all 3.5cc of fuel.
I'm about to take apart the whole car inside out, clean and reassemble, hoping I'm gonna find some miraculous discovery which is going to fix everything. before i do, i hope you guys can help me out. and if there is anything you need to ask or are unclear about, ill try to answer as best i can. I'm in australia and it is currently 11pm on my watch; GMT+11 so i can't instanly answer all questions though ill get on every morning to check
thanking all in advance.
first of all; i own a sinyih truggy, about 5 years old, 1/8 4WD w/ 3 diffs, 3.5cc force engine, and cost me about AU$800 then. i only run on 10% nitro (its my personal preference). i got my LHS to build it for me, which i think is the stupidest thing I've done yet.
i think i need to detail everything because I'm not going anywhere soon
Ever since i got it home, nothing has ever been right. in the first six months, i did very rare weekend runs. storage for the next 12-24 months, tried it a few times, gave up, and back to storage. every 12-or so months i tried to get it started.
please note that i store it in a cool, dry garage free from anything bad, although i dont use afterrun oil. i dont store fuel in the fuel tank.
during the first year, i could barely get the damn thing started; it often flooded, and could not tune it. i think it was partly (not completely) my fault.
when the thing ran, with the occasional flood and unstartable fits, the truggy would randomly (and i mean randomly) run dead max speed, and veer left; it smashed into trees and fences a few time, pretty badly. thats when storage started. turns out my transmitters potentiometer (variable resistor connected to the throttle control) was set to much on one side, and hence would 'half-short'. I've since fixed that.
my glowplug has already had one untimely death (after only about 6L [2 gallons] of fuel). i did not have a label or reference number, but my LHS gave me a OS A5 plug (medium cool). i have always had trouble tuning the truggy, with both plugs, i think its due to inexperience. i can easily tune anything, that is, anything but this!
just lately I've tried to get it started, again. the problem is that it runs. but i think that the LSN has problems, when the pinch test works, it struggles up inclines from stationary, spraying lots of smoke. it feels weak and sounds as if its too rich, though leaning does no good for the engine. when i accelerate; ie from stationary-to-half throttle instantly, the thing kills itself. when i slowly accelerate, it seems to struggle, kind of pulsing, though does not pick itself back up. whenever i lean the engine, it easily kills in acceleration. it looks and sounds good off ground; i like a little richer mixture for open areas (i dont tune off ground, its just an observation). richening it seems to make problems worse. leaning makes it have epileptic fits. oh and when the piston is on the top of its stroke, i can hear some small air leak, but is a very, very faint sound (is it normal??!?!?!)
the engine now does not keep alive. i use a starter box instead of pulling now. and does not keep life as soon as the glowplug warmer is removed, about after 3 seconds. even idling higher cannot save it. to keep it alive, i rev it a bit whilst taking it out. the glowplug is an OS A5.
i have taken the engine apart before. it has no shims; just the block, glowplug-block thingy and heatsink. now it seems that fuel or something is leaking or is wetting the side of the engine block, and the silicon seal between the header and exhaust opening is leaking oil (i hope they are related). the fuel line seems to sometimes randomly pressurize, and requires screwing the HSN in then back out to relieve pressure to prime. just a few hours ago, there was a pressure build up again, and the engine flooded; i mean flooded with pretty much all 3.5cc of fuel.
I'm about to take apart the whole car inside out, clean and reassemble, hoping I'm gonna find some miraculous discovery which is going to fix everything. before i do, i hope you guys can help me out. and if there is anything you need to ask or are unclear about, ill try to answer as best i can. I'm in australia and it is currently 11pm on my watch; GMT+11 so i can't instanly answer all questions though ill get on every morning to check
thanking all in advance.