How a street directory saved me from misfortune

WhitePhantom SG

hi guys
jus now while travelling on the back along clementi, my bike ran out of petrol, TOTALLY... shucks! i forgot i was on reserve!!!
stopped at the side n kan chiong for a while. Luckily i got a street directory in my bag, i realised the nearest petrol station only 2km walk-n-push distance....
i gotta admit the feeling is so blur n lost like very jia lat lidat at that time. so guys pls remember to top up petrol when required, or else if u kena stuck in expressway, duno must push bike how many km then can find petrol station liao.....

another Q: jus now when petrol finished, as u all know, the engine wil stall upon further opening of throttle. wIll this harm the engine anot?

l3stat SG

mmmmmkay, let's discuss this... but i must first state that i'm not too sure where the 2T goes to for a 2 stroker.. i see a tube leading from my 2T reservoir to the carb, and another one going into the crankcase...

digress a little: for 4 strokers, it won't harm the engine. your engine is lubricated no matter what happens.. in fact, when your bike runs out of petrol and it just dies, no issue at all since your piston(s) are more thoroughly lubricated by the 4T in the crankcase (petrol "washes" off the 4T on the cylinder walls/piston rings).

for 2 strokers: don't think it will, but i'm assuming that the stupid tube that runs into the crankcase actually does some work. besides, if 2T is fed into the float bowl, even when your bike runs out of petrol, 2T will still atomize/evaporate and enter your cylinder (when your engine is ABOUT to die, the piston is still moving, so airflow is there). maybe perhaps not that much. which leads to a discussion about how the vapour pressure of a substance is influenced by the presence of "impurities" (that is, petrol), but that's something i can't really contribute on...

someone else to keep the ball rolling? Mr. Green

Noah SG

If I did not get things wrong, the 2T lubricates the piston head against the piston wall ….. the 4T simply lubricates the gearbox gears, and does not go into the engine at all. If you run out of fuel, you simply cannot go further, so I guess the damage to your piston will be limited because you will eventually stop and not go any further. There’s the problem of air lock. That, I’m really not sure ….

l3stat SG

yup that's right for 2 strokers, about the gearbox oil think. air lock? care to elaborate? when there's no fuel, the engine simply stops running because there's no driving force on the piston anymore. your weight plus the bike simply weighs down the system. hmmm.. seems like if no one can explain how the 2T is actually administered to the engine itself, theories abound, but no answers... Mr. Green

nismoS132 SG

we need a resident rocket scientist Laughing

TZR SG

i oso kenna this stupid incident last week. Was heng heng sent my gf home liao came to bt batok near my hse then no petrol... pushing distance damn near lah, about 0.5km got a Caltex liao... but i push upslope, and my fullface helmet dropped and roll down the slope.....i can only use my sad eyes to view the scene... Crying or Very sad

WhitePhantom SG

knn, i realise that jurong n clementi got very few petrol stations, esp if u r travelling directly from jurongeast MRT back to Buona VistaMRT that rd is boonlay way/commonwealth ave

when i came out from JEC that nite, oso got one xr400 rider stop beside me n ask me where the nearest esso. i oso duno where cos i dun pump esso, i only know yuhua village there got one station dunno wat..

then in the end, it was my turn to look for petrol !!! shit sia, i only pump shell, couldnt find one along the way...
eventually it was Esso who saved me.... the clementi one Very Happy

MoNsTer SG

i live in clementi.. and its true there are very little petrol station.. tat time.. my frenz at my hse here, in order to pump shel he go all the way to bt timah... i tink there is another 1 at holland v and buona vista south there...

sakaratulz SG

air lock its only for diesel engines…thats is wat i was taught…..dunno true or not. petrol engines dun experience such things….

Noah SG

The 2T is injected to mix with the petrol and it lubricates between the piston head and the cylinder wall. Else, the piston head will be in friction with the cyclinder wall ...

nismoS132 SG

i tot it’s the piston rings that prevent the piston from rubbing against the walls?

sakaratulz SG

piston rings is to prevent any leakage of petrol in the combustion chamber Smile

l3stat SG

yeah that we know. but how? through a tube, yes but to where? the flat bowl of the carb? along the venturi? or a separate tube into the crankcase? for my bike i see 2 tubes, one to the carb's flatbowl, one to the crankcase. whole lot of difference it'll make to the debate, where it is administered, hence my statement. how well does 2T atomize in concentrated form? esp when the flat bowl is free of petrol when the tank runs dry...? and then how would we know how well the engine internals are lubricated when the engine stalls after the tank is dry?

Rolling Eyes a bit hard to answer hor? sigh... henry is right ah.. someone volunteer to take up a course in motorcycle maintenance/building leh.... Mr. Green

to add to your comment, 2T lubricates the crankshaft, con-rod, etc, basically everything below the piston as well. or else, even if there's 2T on the cylinder walls protecting the piston, your engine is going to meet its maker.

l3stat SG

the actual use of piston rings is to maintain a tight seal so that any pressure differences above and below the piston can be maintained. at the same time, to ease the up and down movement of the piston. the usual pistons measure about 2 inches from the crown to it's bottom most edge. can you imagine the amount of friction that surface area can generate if it's all in contact with the block?

nismoS132 SG

for my 2t pump, it's connected directly into my crankcase with a spinny thingy, and 2 tubes into the carb.

i assume the gears spin the spinny thingy which controls the amount of 2t that goes into my carb. the spinny thingy has an oil seal that prevents 2t from entering the crankcase, becoz my oil seal is damaged/leaky/spoiled, i've got 2t going into my crank.

of course, that oil seal is replaced now. and mA b|k3 is l33t @ga|n!~~!!!11!!1

nismoS132 SG

Running on a single ring is not going to cause any major problems
(hopefully), but unless you're racing it then stick to the twin ring set-up.

The two rings will give better low rpm sealing, and so more power, so
offsetting and added friction.

A single ring will give better high rpm performance as thanks to the high
combustion chamber pressure the single ring seals well enough, so that a
second ring is not needed, and would be just going along for the ride.