what is the best way to stop...

[Castrol]

I am kinda new to nitro rc, so I just want to know what is the best way to stop your engine? Team associated suggested pinching the the fuel line to the carb or stopping the fly wheel with a wooded stick. But HPI suggestes that "If you want to stop running the car before the fuel runs out, use a rag to stick over the exhaust tip to stop the engine." Man...it's confusing cuz Team Associated said not to plot the exhaust tip! Thx

 

[Çh®i§tiªñ]

This is a 'what do you think?' is better for your engine question. I personally stop the flywheel with my finger on all my RC's. The other option for me is the exhaust. However, that will create a minor flood in your mill, making it slightly harder to start shortly therafter. I definately do not agree with pinnching the fuel line. It leans the mill too much for my liking. Not to mention, you sometimes will have to wrestle the car down because it wants to take off! I just dont like it.

So the choice is up to you. Those are 3 possibilities right there.

For me:
#1 Flywheel Stop
#2 Exhaust Stop

NEVER = Pinch the fuel line

 

[NCNitro]

I plug the exhaust on my RCs and. I also do not like the pinch way for the same reasons Christian mentioned. I would rather flood it a little rather than leaning it everytime I stop it. I also try not to let my tank run dry for the same reason, no fuel = no lubrication. Unless it will be sitting for a long time, then I will let it run dry at idle to get the fuel out of the system before putting in my after run oil.

 

[mcvickj]

I just use my thumb to plug the air filter to stop my RS4. That is what HPI suggest in the manual.

Killing the engine using your thumb and the flywheel. That sounds like that would hurt. How quickly does that shut the veichle off?

-JR

 

[Retread316]

"To each his own"

Thumb/finger on the flywheel: I've heard of people doing that - just a bit creepy to me...on a vehicle equiped for bump starting where the flywheel is accessible through the bottom of the chassis you can tap it with the toe of your shoe to stop the engine. I don't like the idea of my fingers being anywhere near quickly rotating masses of metal - regardless of how small those masses of metal are.

I use the "plug the exhaust tip" method - never had a problem with a flooded engine...I've also used the "plug the carb inlet" method, but because I use LARGE air filters it requires that I remove the filter first.

 

[x_789]

I agree with christian. I stop the fly wheel it is kinda scary the first couple times but you can just quicly hit it with your finger and it stops no problem.

If you dont want to do that for what ever reason then just plug the exhaust, even though I think you got a better chance of getting burnt that way than the flywheel hurting you Plus i don'tllike excess fuel and my pipe. The bump stoping the FW is the most effecint.

I agree thought that pinching the fuel line is bad it leans the motor so it revs high then dies. That should only be done when setting LS neddle. X

 

[SkyMaxx]

I have tried all three methods and they all work equally well. Christian is right on the money when it comes to deciding which is best.

I use the plugging of the exhaust method all the time, and have yet to suffer any adverse affects.

I tried the flywheel method and was pleasantly surprised when it stopped rapidly and didn't hurt my finger. I was like Retread but got overly curious and tried it one day. I still have all my fingers. Others use the butt end of a screwdriver for the purpose of stopping the flywheel.

I did the pinch of the fuel line one time and one time only. The way the engine behaved during that shutdown sequence was abnormal to my ears and my engineer mind said that can't be good for the engine (especially when done with great frequency). I then thought through what was happening and realized the whole lack of lubrication, excessively leaning the engine, and the bad things associated with those two conditions are indeed bad.

BOTTOM LINE:
1. Plug exhaust
2. Friction stop to the flywheel

Never pinch fuel line...

 

[Castrol]

THx guys for answering my questions, I have been pinching the fuel line for some times now, and yeah the rpm goes really high and the engine dies out. I pinch the line because the guy at the hobby shop (hobby people) told me to do so and also team associated told me to do so. But I think plotting the exhaust is the best way after I did it. But my finger is a little burned, but it's ok. Thx

 

[SkyMaxx]

You can use anything you want to plug the exhaust. If you have an exhaust deflector on the stinger, a pair of plyers clamping the tube shut works just fine.

 

[mcvickj]

Or an old rag. That is what I use.

-JR

 

[thedominator]

I have always plugged the exaust

 

[Error401]

I have always unhooked the fuel line behind the filter. I have done this for years on aircraft engines (2 and 4 stroke) and my car engines. The engine will run for a few seconds at an dile, rev up a little and shut off. There is more than sufficient oil left in the engine to keep it lubricated. What harms engines is a lean run, like when the temps top 300+ for an extended time.

My question is, if you use a rag to plug the tip, doesn't that raise the pressure in the tank and thus inject more fuel into the carb and thus crank case? If this is true, how do you get the unburnt fuel out so the bearings and crank doesn't rust? After run oil does attract and neutralize moisture (water, methyl alcohol and nitromethane), but how much after run oil would it take to netralize a partially flooded engine?

 

[Team 17]

Good question. I always plug the exhaust.

 

[bmoc2008]

i stop it sometimes but holding my han\d over the exhaust or just letting it run out of gas is that bad

 

[Error401]

I forgot to address the "starve it for air" way of shutting it down. Here's my logic on this one: Engines are basiclly air pumps due to the way the piston and crank ports are timed. Air gets drawn into the carb, makes it's way into the cylinder and out the exhaust. If you plug the intake, won't it cause a vacum in the carb? If this is so, the only way into the carb is the fuel port. This would suck raw fuel into the carb at a greater rate than normal, and the result is an excess of raw fuel in the crank case.

I'm not saying "do it my way", do what works for you. That's just my 2 cents on the issue.

 

[LarryA]

I used to use the finger over the exhaust method until I got my Savage. Seems everytime I do with that truck, the pressure to the tank completely floods my engine. I started using the fuel line pinch, figuring the very short time it runs lean should never put the engine to an under lubed condition. A couple seconds is no comparison to running under a too lean condition. The flywheel method is what I greatly prefer but that isn't practical with the Savage.

 

[Çh®i§tiªñ]

I have to laugh at myself on this thread. One thing I overlooked (the blatently obvious) is that most manufacturers recommend that you run completely out of fuel. Makes sense. After all, leftover fuel in either the tank, lines, fuel filter or engine can all gum up and just be a pain in the ass. Well, that being said, you have to look at how lean the engine gets doing this. can't be any different from pinching the fuel line right? So then it should be o.k.. Just my observation. As time goes on, I always change my views.

I'm still a flywheel stopper though!

 

[Error401]

Yeah, HPI also suggested using 100wt oil in the shocks. Here's a thought, I only look at the exploded diagrams.

 

[Çh®i§tiªñ]

LMAO!

You are the guy with a leftover bag of parts after building a gas grill, arent you?

 

[LarryA]

One point goes to Çh®i§tiªñ ! That was funny:write: