Volvo's b21 engine a.k.a the "Red Block" (1974-1985):
Volvo240, 260 Series

Volvo's b23 engine (1979-1984):
Volvo 240, 740

Volvo's b230 engine (1985-1995):
Volvo 240, 740, 940

Increased performance can be derived by changing to Weber carbs - plain and simple.

The downdraught DGV/DGEV carburetor is a very simple carb and adjustments are easily made.

A noticeable improvement in low end torque, mid/top end acceleration, and even fuel economy, will be seen with this kit installed.

• Genuine Weber 32/36 DGEV Carb for electric choke setup (stock).
• Genuine Weber 32/36 DGV Carb for customers who want to change to a manual choke setup + choke cable
• Intake Manifold
• Gaskets
• Linkages
• Air Filter

NOTE: You will have to change fuel pump on injected cars to a "High Volume, Low pressure" pump - no greater than 3psi. If you do need that pump, click on the following link : LOW PRESSURE FUEL PUMP

NOTES:

When converting a Volvo B230 "Redblock" from fuel injection (typically Bosch LH-Jetronic 2.2 or 2.4) to Weber carburetors, you aren't really looking to "fool" the ECUyou are looking tobypassit.You don't need to fool the old ECUyou need to replace its "brain" regarding spark.

Because these engines use a split system where fuel and ignition are handled by separate (though communicating) control units, the challenge isn't making the fuel ECU think injectors are still there; its ensuring yourignition timingremains functional once the fuel sensors are gone.

The Ignition

On most B230 engines (especially those with LH 2.4), theIgnition Control Unit (ICU)relies on signals from theFuel ECUand theAir Mass Meter (AMM)to determine load and timing advance. If you simply bolt on carbs and unplug the AMM, the ignition will usually default to a "limp home" mode with fixed timing, which will make your performance-oriented Webers NOT performance-oriented.

There are two primary ways to handle this:

• "Old School":Most owners ditch the electronic ignition entirely. You can source a mechanical-advance distributor from an older B21A or B23A engine.

  • Note:If your B230 has a head-mounted distributor, you may need to swap the intermediate shaft to drive a block-mounted mechanical distributor.

• Standalone:Install a programmable ignition system (like a123Ignitiondistributor or aMegajolt). These are designed to provide a customizable timing curve without needing any input from the original Volvo ECUs.

Fuel Pressure Management

Your stock B230 fuel pump is designed to push roughly43 psifor fuel injection. Weber carburetors are only want about2.5 to 3.5 psi. If you use the stock pump, you will blow right past the needle valves and flood the engine.

Pump:

Low-Pressure Pump:Bypass the stock EFI pumps and install a low-pressure electric pump near the tank. Like the one listed above.

• Remove the EFI Harness:Once youve sorted your ignition, you can physically remove the fuel injection wiring harness and the Fuel ECU. They are no longer doing anything. Or just leave them - up to you.

• Plug the Injector Ports:If you are using the original head, youll need to plug the injector holes in the head or the intake manifold (depending on your specific B230 version).

• Throttle Linkage:You will need a cable or construct the linkage to connect your Volvo gas pedal to the Weber linkage.