How to Stop Your Nitro Engine
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Stopping your Savage engine can be a source of concern for various reasons. Although merely running out of fuel is one method, there are many times when you may wish for the engine to stop immediately. The focus of this article is to detail the various methods, their pro’s and cons and suitability for various situations.
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Methods
Plugging the Exhaust
Simply plugging the exhaust stinger will stop the engine. This method is very quick as the body does not have to be removed. Unfortunately this method often floods the engine as excessive pressure can build in the tank before the engine stops and force extra fuel into the carburetor. Using your thumb or finger can work, however burns can result. A rag will work, but the engine dies slowly as some exhaust still flows through the rag. A rubber plug that fit’s the exhaust stinger is the best. JLR manufactures a commercial one that doubles as a tuning screwdriver.
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JLR Screwdriver with Exhaust Plug |
Stopping the Flywheel
Placing your shoe against the rotating flywheel has been a tried and true method of stopping a nitro engine for years, however access to the flywheel in a Savage will not allow you to do this.
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Be Careful of Rotating Machinery |
Many people use the plastic end of a screwdriver and press it against the flywheel, however this is not safe as the screwdriver may bounce a bit and the sharp end may puncture your hand. Make your own custom tool from a piece of wooden or plastic dowel and perhaps add a bicycle hand grip, or equivalent, to one end. Note that the body must be removed for this method to work, with the exception of the HPI kit below.
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Sharp End can Injure |
HPI has an inexpensive engine stop kit available that fits all Savages and relies on stopping the flywheel to kill the engine. Note that the body does not need to be removed for this method.
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HPI‘s Engine Stop Kit, P/N 85068 |
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External Push-to-Stop Feature of Kit |
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Plastic End Pushes Against Flywheel |
Plugging the Intake
This method requires you to plug the carburetor mouth with your finger (or better yet, a rubber stopper). The air-filter assembly must be removed, and due to the ty-wraps holding it in place, damage to the assembly may result. This removal may delay you stopping the engine to an unacceptable level. Some people have had success by squeezing the intake tube between the air-filter and the carburetor, but it’s difficult to completely block off the air and stop the engine.
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Air-Filter Assembly |
Blocking the Fuel Line
Pinching the fuel line is a fairly quick and popular way to stop an engine, although it does cause the engine to lean out, which may not be good if the engine is already screaming at high throttle. Commercial clamps are available to assist with this procedure. Removal of the body is necessary, unless the fuel line is routed through the rear shock tower before going back into the vehicle. Pulling the fuel line off the carburetor is not recommended as fuel tank pressure may spray fuel out of the fuel line and cause a fire.
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Fuel Line Clamp |
How to Stop a Run-Away Engine
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Dangerous and Inconsiderate |
If the vehicle suddenly goes WOT (wide-open-throttle) while driving, you have few recourses available:
If still within radio range, steer into thick grass or brush, even water (which will shut off the engine and "generally" won‘t hurt it), or at worst case, a solid object, or;
Shut off your transmitter and hope the Fail-Safe or throttle return spring can still do its job.
If the engine goes to high throttle immediately after starting it, you will find you suddenly have a nasty wild animal trying to escape. As the wheels are probably spinning quickly, firmly hold the Savage against the ground to stop the wheels, and if the engine doesn’t completely stall, use either the flywheel method or exhaust plug method to finish stopping it. Toasting a clutch is much less expensive to repair than replacing or repairing an engine.
If the body is off, using your flywheel stop tool is the best method. If the body is on, plugging the exhaust is the next quickest way to stop the engine. Note that any method of stopping fuel flow can take time and lean out your engine to the point internal engine damage occurs. Removal of the air-filter also takes too long.
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