Fuel for rc car!

[jameslow]

Hmm..... Which is the cheapest rc car fuel???

[baby_zyklon]

Don't go for cheapest lah. Go for something that will make your engine run consistent and powerful. Don't need to be the most expensive or most powerful fuel, but your engine must be able to run smoothly on it.

Many years ago when I was still playing car, I ran into this brand of fuel(yellow colour, forgot which brand, then again there are so many "yellow colour fuel") that just doesn't work in my kyosho engine. It worked on my OS though. So I don't think its fuel problem. I changed back to the trinity monster horsepower and all was fine again. When I say it doesn't work, my engine simply doesn't run at all. It starts fine, idle fine, runs at high throttle fine, but when it is accelerating from idle, it just load up all of a sudden and occasionally, stall. No amount of engine tuning fixed that. However, once I swop back to the trinity stuff, it started running well again.

[maskedrider]

bascially, depend on wht engine u running.... theres are different nitro content in different fuel....
there are 25%, 15%...etc etc

and 25% and the most common used now...

hope this help

[jameslow]

Don't go for cheapest lah. Go for something that will make your engine run consistent and powerful. Don't need to be the most expensive or most powerful fuel, but your engine must be able to run smoothly on it.

Many years ago when I was still playing car, I ran into this brand of fuel(yellow colour, forgot which brand, then again there are so many "yellow colour fuel") that just doesn't work in my kyosho engine. It worked on my OS though. So I don't think its fuel problem. I changed back to the trinity monster horsepower and all was fine again. When I say it doesn't work, my engine simply doesn't run at all. It starts fine, idle fine, runs at high throttle fine, but when it is accelerating from idle, it just load up all of a sudden and occasionally, stall. No amount of engine tuning fixed that. However, once I swop back to the trinity stuff, it started running well again.

haha.... not going for the cheapest la... just wonder the cheapest fuel can go as long as ??? haha!!!

[jameslow]

bascially, depend on wht engine u running.... theres are different nitro content in different fuel....
there are 25%, 15%...etc etc

and 25% and the most common used now...

hope this help

hmmm.... 15% fuel can use for car? i thought for plane only . last time i use 25 % than i change to 16% found everything the same haha... Btw do u know y my engine use up fuel so fast? when is turn anticlockwise for the Carburetor high-end adjustment screw(reduce the amount of fuel input), the engine run n stop after i accelerate. After i increase the fuel input the car run very well n smooth.... but just run awhile the fuel tank empty haha!!!!

[dirtdynamics]

how long is a "while" ?

how big is your tank?

how is you carb settings ?
too rich ?

exhaust ?
too much smoke?

when you throttle will the pipe spit out a lot of unburnt fuel?

Check these and then we can tell ? Your description is too vague to determine the cause.

FYI, nitro don't last long one. No matter what % nitro you use.
Thats the % of mixes inside to provide different buring characteristics for different applications

[jameslow]

how long is a "while" ?
full tank run for >5 but <10 min around there.

how big is your tank?
< 70ml > if im not wrong!

how is you carb settings ?
too rich ?
< I think too rich, but run too lean it die off easily >
exhaust ?

too much smoke?
< yape. and the smoke look white in colour to me >

when you throttle will the pipe spit out a lot of unburnt fuel?
< will spit out some unburnt fuel. and everytime after run, the base of exhust will cover with a thick layer of oil liquid. >

Check these and then we can tell ? Your description is too vague to determine the cause.

FYI, nitro don't last long one. No matter what % nitro you use.
Thats the % of mixes inside to provide different buring characteristics for different applications

Thanks a lot!!!

[jameslow]

how long is a "while" ?
full tank run for >5 but <10 min around there.

how big is your tank?
< 70ml > if im not wrong!

how is you carb settings ?
too rich ?
< I think too rich, but run too lean it die off easily >

too much smoke?
< yape. and the smoke look white in colour to me >

when you throttle will the pipe spit out a lot of unburnt fuel?
< will spit out some unburnt fuel. and everytime after run, the base of exhaust will cover with a thick layer of oil liquid. >

Check these and then we can tell ? Your description is too vague to determine the cause.

FYI, nitro don't last long one. No matter what % nitro you use.
Thats the % of mixes inside to provide different buring characteristics for different applications

Thanks a lot!!!

[dal]

Cheap fuel?

Gents - Fuel is a very specialised subject. I fly planes and mess with r/c car engines. In the last few weeks, I have learnt a lot about fuel and how it affects engines. There is a lot of hype on using high % of nitro in fuels. Nitro does help in boosting the power of the engine giving more revs hence more speed. Great for racing cars! The higher the nitro, the more expensive you have to pay for the fuel. It is not true that your car will run much better with high nitro fuel [20 - 25%]. Back 30 yrs ago, fuels were mainly 80% methanol and 20% castor oil, with the ocassional 5% nitro [in this case the methanol is 75%]. All by volume to make 100% by volume. But with the quest for more speed, higher nitro fules are marketed, I suspect it is also more profitable... it's seems sexy or macho to use high nitro fuels I guess.

The design of an engine plays a role on fuel types too. If it is a modern engine, it is likely to be low compression [you can turn the shaft of the engine easily under compression]. This makes the engine easy to use with pull starters or small electric shaft starters. With a high compression engine, it is not so easy to turn the shaft round. High torque starters are required [back 20 yrs ago]. To compensate for power loss in a low compression engines, high nitro fuel is used. But with a high compression engine, one can get away with low nitro fuel or even zero nitro. I have read of R/C car racers that have modified their modern engines from a low compression to a higher compression using zero nitro fuel. This is quite tricky and you need to have some engineering knowledge to execute this. Their test is simple - race with another car that runs on high nitro fuel on a straight road and see who gets there first.

In regards to the white smoke, you are setting your engine too richly, hence a lot of unburnt fuel leaving a pool of oil at the exhaust. This drains your fuel tank very fast too. There are lots of possible causes such as using a wrong glow plug [try a hotter plug], your engine cylinder or piston could have worn out due to wear. If the above two are OK, I should use just 10% nitro fuel with at least minimum 18% oil content [I prefer 20% castor oil]. Follow the instructions in needle valve setting and start up. For me, I prefer to set up my engine on a test bench, fit a propeller on it and fire up. This way it helps me run in a brand new engine properly, do the set up at low idle and full throttle. It also gives me a chance to understand the characteristics of the engine.

Oh - you also pay for what you get. Don't expect a cheap engine to last long as I found out the hard way.....

Hope this helps to shed some light.

[dirtdynamics]

Bro...

seems you running too rich but if you say that if you lean then your engine dies, will it idle ?

What motor is that ?

If its a cheap engine then no pint la.... seriously

[jameslow]

Bro...

seems you running too rich but if you say that if you lean then your engine dies, will it idle ?

What motor is that ?

If its a cheap engine then no pint la.... seriously

idle can.... hmmm it is a thunder tiger engine... im new in rc so dun really know about engine haha!!!

[dirtdynamics]

what car is that again ?

[jameslow]

what car is that again ?

http://shop.rotor.com.sg/show-detail.asp?prodid={22D22FC7-D9F1-40FC-A7CF-5DE2CFED2BE3}

[dirtdynamics]

try to reset your carb and then retune it back to get minimum oil wastage...

get it rich but not until it spits out unburnt nitro so much....

if it still eat up yur nitro then .................

[jameslow]

try to reset your carb and then retune it back to get minimum oil wastage...

get it rich but not until it spits out unburnt nitro so much....

if it still eat up yur nitro then .................

haha.... Thanks a lot bro! better hope i wont haha.....:X