OLDSKOOLRYAN

hi people, whats the difference between an efi and the mfi engine blocks?
are they inter-changable ie mfi head with efi block and vise versa?

just wondering as my bottom ends gone and a mate has a good efi rst block.

thanks for any info

base190380

hi, both the fiesta and escort engine blocks are the same assuming its from a rs turbo. Head are different though, the efi has ported cutouts for the injectors and the mfi does not.

OLDSKOOLRYAN

yes i am talking rs turbo blocks, so if my blocks proper fooked im assuming its safe to use/rebuild the efi one.
cheers

smitsturbo

i read somewhere..but dont hold it to me that the fiesta turbo's block was stronger than the escorts, dunno why but it'll be my mission to find out

OLDSKOOLRYAN

any advice would be great
cheers

Chris69

they are interchangeable but the crank position sensor hole is not present on nearly every mfi block.
apart from that as far as i'm aware there identical.
also gives u the option to go efi at a later date if u fit the flywheel from the efi rst aswell

JesseT

Efi block has a dedicated place for the knock sensor with an M8 bolt thread.