## How to Build a Twin Engine Car
**Introduction**
Building a twin engine car is a challenging but rewarding project that can be completed with the right tools, materials, and knowledge. Twin engine cars offer increased power and performance, and can be a great way to turn heads at car shows and events.
In this guide, we will walk you through the steps of how to build a twin engine car, including:
* Gathering the necessary tools and materials
* Preparing the donor car
* Installing the second engine
* Fabricating the necessary components
* Tuning the engine and drivetrain
* Safety considerations
**Tools and Materials**
Before you begin, you will need to gather the following tools and materials:
* Two donor cars with compatible engines and drivetrains
* A garage or workshop with plenty of space and ventilation
* A welding machine
* A metal cutting saw
* A drill and drill bits
* A socket set
* A torque wrench
* A timing light
* A fuel pressure gauge
* A boost gauge
* A tachometer
* A wideband air/fuel ratio gauge
* A set of engine hoist stands
* A set of jack stands
* A set of ramps
* Safety glasses
* Earplugs
* Gloves
**Preparing the Donor Car**
Once you have gathered the necessary tools and materials, you will need to prepare the donor car. This involves:
* Removing the front and rear bumpers
* Removing the hood
* Removing the trunk lid
* Removing the seats
* Removing the carpet
* Removing the dashboard
* Removing the steering wheel
* Removing the pedals
* Removing the center console
* Removing the transmission
* Removing the driveshaft
* Removing the rear differential
**Installing the Second Engine**
Once the donor car has been prepared, you will need to install the second engine. This involves:
* Mounting the second engine in the engine bay
* Connecting the engine to the transmission
* Connecting the engine to the driveshaft
* Connecting the engine to the fuel system
* Connecting the engine to the electrical system
* Connecting the engine to the cooling system
* Connecting the engine to the exhaust system
**Fabricating the Necessary Components**
Once the second engine has been installed, you will need to fabricate the necessary components to complete the build. This may include:
* A custom exhaust system
* A custom intercooler
* A custom intake manifold
* A custom fuel system
* A custom wiring harness
* A custom transmission mount
* A custom driveshaft
* A custom rear differential
**Tuning the Engine and Drivetrain**
Once the necessary components have been fabricated, you will need to tune the engine and drivetrain. This involves:
* Setting the timing
* Adjusting the fuel pressure
* Adjusting the boost pressure
* Adjusting the air/fuel ratio
* Adjusting the ignition timing
* Adjusting the valve timing
* Adjusting the transmission shift points
* Adjusting the rear differential ratio
**Safety Considerations**
Building a twin engine car can be dangerous if proper safety precautions are not taken. Always wear safety glasses, earplugs, and gloves when working on the car. Never work on the car while it is running. Always use jack stands to support the car when it is lifted. Never drive the car without a helmet.
**Conclusion**
Building a twin engine car is a complex and challenging project, but it can be completed with the right tools, materials, and knowledge. By following the steps outlined in this guide, you can build a twin engine car that will turn heads and provide years of enjoyment.
