Fuel Injector Bung for CIS to EFI Conversions
The EFI bungs are specifically designed to allow Bosch/Rochester type EFI injectors to fit in intake manifolds using BOSCH CIS (Continuous Injection System) type injectors. They are specifically designed for the Porsche intake runners, but will fit other intake manifolds using the same BOSCH CIS injectors. Each bung includes a high temperature Viton O-ring.
Here is what a stock CIS injector looks like mounted on the intake runner. Intake runner shown is from a 1978 Porsche 911
Photo of the intake runner with the CIS injector removed.
Photo of the intake runner with the CIS bung removed
Photo of the CIS injector (left) (Bosch #0 437 502 004), the CIS bung (middle), and the new EFI bung (right). Bosch makes many different CIS injectors that have different numbers, but still are compatible with these bungs. Look below for dimensions.
Photo of the intake ready for the installation of the EFI bung.
Photo of the EFI injector bung installed in the intake runner.
Photo of the intake runner with a Bosch EFI injector installed.
Photo of the intake runner with a Rochester injector installed.
Relative dimensions of the parts.