Posted July 20, 2021 by Benjamin Hunting Know How
How to Use a Rolling Start to Escape a Dead Battery: 3 Tips
Have you ever been stranded by a dead battery? If you have a manual transmission, a rolling start can help you escape being stuck by the side of the road. This technique, also known as bump starting or push starting, relies on your engines compression to bypass the electrical starter and ignite the fuel in the pistons. If youve got enough room and hopefully, a downhill slope its a alternative way to start your manual-equipped automobile in an emergency situation.
Here are three tips for a successful rolling start:
1. Find a Hill
In principle, a bump start is simple: turn the ignition key, put the clutch in, get the car in gear and then start to move forward. Once youve gathered enough speed, pop the clutch and the engine should fire.
In reality, its not always that easy to move something as heavy as a car, especially if you dont have any friends to help you push. It could be tempting to ask a passing motorist to push your car with theirs, bumper to bumper, but dont its simply too dangerous, and it could damage your car or lead to injury.
The best solution is to point your vehicle down a hill thats steep enough to get you rolling at 5 to 10 miles per hour, but not so intense that, if your car doesnt start right away, you cant easily stop. Keep in mind it may be harder to steer (no power steering without a running engine) and to stop (no power brakes without engine vacuum), so plan your roll-start location carefully.
2. Choose a Gear
After youve gathered speed, you need to release the clutch quickly and let the transmission send the motion of the vehicles differential to the engine, spinning it up and causing it to fire. To do this effectively, you must select a gear that will offer enough torque to move the motor, but not so much that it acts as a brake and stalls your forward momentum. Typically, second gear is a good option for most vehicles. But never, ever do a rolling start in reverse its too risky to try to watch where you are going, steer and pop the clutch all at the same time.
3. Dont Try This With an Automatic
Only vehicles with a human-operated clutch can successfully pull off a rolling start. A traditional automatic doesnt feature the same capability, and modern dual clutch designs that use a pair of clutches operated by computer are also off the list. If that third pedal isnt there, trying to do a rolling start will only result in damage to your transmission.
Check out all of the batteries available on NAPA Onlineor trust one of our 17,000NAPA AutoCare locationsfor routine maintenance and repairs. For more information on rolling starts, chat with a knowledgeable expert at yourlocal NAPA AUTO PARTS store.
Photo courtesy of Wikimedia Commons.
battery, bump start, clutch, dead car battery, jump start, manual transmission, pop the clutch, rolling start, starter
Benjamin Hunting View All
Having been bitten by the car bug at a young age, I spent my formative years surrounded by Studebakers at car shows across Quebec and the northeastern United States. Over ten years of racing, restoring, and obsessing over automobiles lead me to balance science writing and automotive journalism full time. I currently contribute as an editor to several online and print automotive publications, and I also write and consult for the pharmaceutical and medical device industry.