project motor: 3.9 or 4 litre? into an EA - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

santoitaliano · 08-01-2004, 05:00

i'm going to build a project motor over the next year or so to drop into my EA.... should i stick to the stock 3.9... or is there much work into putting a 4 into it?

anyone got any ideas?

thanks,

santoitaliano · 08-01-2004, 05:04

i dont want to have to change the tranny or anything... AU motor sounds like a prick to adapt... is the 4.0litre off say an EB just a drop in?

thanks,

danege · 08-01-2004, 05:07

Yes, an EB 4.0 will drop straight in and will have no problems with the 3.9 computer.

Dane.

Walkinshaw · 08-01-2004, 05:57

just use an AU motor. Much better base.

santoitaliano · 08-01-2004, 06:21

au motor i hae to change the starter motor and tranny and mounts dont i?

Troutman · 08-01-2004, 20:20

The starter motors are fully interchangable, and you don't have to use an AU transmission.

Walkinshaw · 08-02-2004, 00:04

i do think you may need to use the AU belhousing

INJECTED250 · 08-02-2004, 03:17

you dont HAVE to use the au transmission belhousing, just the lower bolts dont line up

santoitaliano · 08-03-2004, 08:17

hmmmmm... is the AU motor THAT much better... 4.0ltr EB i think will be enough... not to worried about much performance gain... just build a nice strong motor as a project...

cbf with computer change and looms etc,

monty.v8 · 08-03-2004, 13:35

go the au motor. much stronger bottom end. i'm almost finished my conversion, another two evenings and it'll be done.its not hard at all. use an au bellhousing, ea starter. when i finish i'll do a full write up on what has to be done/used.

Phil