What is the typical weight difference between gas and electric car engines?

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SUMMARY

The discussion centers on the weight differences between gas and electric car engines, specifically in the context of converting a gas vehicle to electric. Participants highlight that while electric motors and drive trains are generally lighter, the substantial weight of batteries, particularly lead-acid and Li-Poly types, can significantly increase the overall vehicle weight. A typical lead-acid battery has an energy density of around 15Wh/kg, while gasoline has an energy density of approximately 45MJ/kg. Ultimately, the conversion to electric is likely to result in a heavier vehicle due to the battery requirements.

PREREQUISITES
  • Understanding of electric vehicle components, including batteries and motors
  • Knowledge of energy density metrics for batteries and fuels
  • Familiarity with conversion processes for gas to electric vehicles
  • Basic principles of weight distribution in automotive design
NEXT STEPS
  • Research the specifications and weight comparisons of lead-acid vs. Li-Poly batteries
  • Explore electric motor options and their weight implications
  • Investigate case studies of successful gas-to-electric vehicle conversions
  • Learn about weight management strategies in electric vehicle design
USEFUL FOR

Car enthusiasts, automotive engineers, and individuals interested in electric vehicle conversions will benefit from this discussion, particularly those weighing the pros and cons of engine weight in conversion projects.

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Hello everyone. Currently my brother and I are considering converting a gas engine car into an electric engine car. I'm still not exactly sure how well the vehicle we have chosen for this project will work. The main issue I'm worried about is weight. So, I was wondering if, in general, a conversation from gas to electric would increase the weight or decrease it. At first I was assuming that an electric engine would weigh less then the gas engine and all the components needed to run a gas vehicle, but then I realized the batteries will probably add a large amount of weight. So, before I go into more specific research of the measurements I would like to have a general idea of whether the weight is going to be an issue or not. Thank you for time.
 
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A typical lead acid battery has a useful energy density of around 15Wh/kg. Gasoline is something like 45MJ/kg.

That should get you started.
 
Li-Poly batteries will weigh a lot less than lead-acid batteries, but they have a nasty habit of exploding if overcharged. Because of li-poly batteries and more efficient brushless motors, radio control aircraft are making the switch to electric based power.
 
Even with the Li-Poly batteries I would suggest that if you want comparable amounts of miles to your gas powered car then your car is going to weight a fair bit more than a normal gas powered car just because of the sheer number of batteries.
 
a hundred or two lbs less for the motor/drive train
and a thousand or two more for the batterys

El-trick cars are HEAVY

google up some projects others have done
 

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