Engine and fuel question

[Sweetlou069]

Hi guys i have a problem i got a dynamite big red Mac 2 .28 nitro engine that hase about 20 tanks in i use with 25% nitro always did , so my problem is the gas seems to not go to the engine all the time , i set back my engine to factory setting, when i hit the gas slow its ok ( when its cold ) but when i floor it it rather dies orchocks but stays on and goes full blast ... When its hot the gas doesn't seem like it wants to stay in the gas line i prime the gas and see the gas go to the engine but the second it touch the carb it goes back to the tanks the engine will still start but will die off right away ??? Do i have a seal problem or sumthing ??

 

[ninnon]

Sounds like your running way to lean (but could also be rich (bogging down) for the first bit, but you'll see why I say lean in a bit) It sounds like your engine is running way to lean, so is choking on acceleration- the reason for the "gas" (fuel) backing up from the carb is because of vapour-lock, which is basically where the carb gets so hot that before the fuel can enter the engine it vapourises, expanding, thus locking everything up and not letting fuel into the carb- that's the reason why I jumped to the conclusion that you're running way to lean. If you want a guide on tuning click HERE.

 

[Sweetlou069]

Sounds like your running way to lean (but could also be rich (bogging down) for the first bit, but you'll see why I say lean in a bit) It sounds like your engine is running way to lean, so is choking on acceleration- the reason for the "gas" (fuel) backing up from the carb is because of vapour-lock, which is basically where the carb gets so hot that before the fuel can enter the engine it vapourises, expanding, thus locking everything up and not letting fuel into the carb- that's the reason why I jumped to the conclusion that you're running way to lean. If you want a guide on tuning click HERE.

To rich even if i put back to factory settings?? Honestly i was hoping more a air leak or sumthing lol

 

[ninnon]

It will be very rich at factory settings, but after you follow the tuning guide I linked you'll be running at peak performance. If there was an air leak there would of been bubbles in the fuel line when the engine was hot or cold

 

[Rolex]

To rich even if i put back to factory settings??

Factory settings are only for starting the break-in, and other than that the engine won't run well that way. MUCH too rich.

 

[Sweetlou069]

It will be very rich at factory settings, but after you follow the tuning guide I linked you'll be running at peak performance. If there was an air leak there would of been bubbles in the fuel line when the engine was hot or cold

Thank u very much was the high needle the problem was way to lean even at factory setting ?? Hade to turn almost 360 degres counter clockwise to get it back ok any ways works like a glove atm thx u for that chart !! Its now in my favorited so i never lose it loll thx again

 

[ninnon]

Thank u very much was the high needle the problem was way to lean even at factory setting ?? Hade to turn almost 360 degres counter clockwise to get it back ok any ways works like a glove atm thx u for that chart !! Its now in my favorited so i never lose it loll thx again

It's ok Glad to know it's fixed.