I've received this question a few times now from potential customers- what parts can they leave off/ out when ordering a new engine or having one built up when using our EFI/EI?
First, you need to have cylinders with the 1/8 NPT injector ports on top if you want to use our thread-in injector mounts. Alternately, some people have mounted the injectors in the lower primer ports but we're not sure about clearance issues on all engine types. The 3rd option is to use our weld-in mounts on the induction tubes.
Second, you'll need return fittings on your fuel tanks. We recommend -6.
Third, you'll require a Duplex fuel selector like Andair and others offer for an RV.
Parts which can be deleted from the engine:
1. Mags
2. Ignition harness
3. 18mm spark plugs (some manufacturers also offer heads with 14mm plug holes)
3. Servo or carb
4. Flow divider, lines, nozzles
5. Mag drive gears
6. Fuel pump pushrod
7. Fuel pump
Some manufacturers make accessory housings with no mag holes, specifically for using crank triggered EIs like SDS.
We suggest you also install a backup power source, either a 2nd battery or 2nd alternator.
I am not sure about the policies of Lycoming on EXP engines, whether they would delete these parts and credit you or not. I believe most independent builders will.
First, you need to have cylinders with the 1/8 NPT injector ports on top if you want to use our thread-in injector mounts. Alternately, some people have mounted the injectors in the lower primer ports but we're not sure about clearance issues on all engine types. The 3rd option is to use our weld-in mounts on the induction tubes.
Second, you'll need return fittings on your fuel tanks. We recommend -6.
Third, you'll require a Duplex fuel selector like Andair and others offer for an RV.
Parts which can be deleted from the engine:
1. Mags
2. Ignition harness
3. 18mm spark plugs (some manufacturers also offer heads with 14mm plug holes)
3. Servo or carb
4. Flow divider, lines, nozzles
5. Mag drive gears
6. Fuel pump pushrod
7. Fuel pump
Some manufacturers make accessory housings with no mag holes, specifically for using crank triggered EIs like SDS.
We suggest you also install a backup power source, either a 2nd battery or 2nd alternator.
I am not sure about the policies of Lycoming on EXP engines, whether they would delete these parts and credit you or not. I believe most independent builders will.
Last edited: