Yes in the BTTF 1 they did have the original Volvo motor in the car but later on, the engine heads cracked or in other words went POOF...which is also why they have to push the car out to the upper lot whenever they want to display it. in BTTF 1&2 some cars did have other engines just to safegaurd against another engine failure just in case. Not only that, the DeLoreans used in the movie where in bad shape anyway.. If u take the Universal VIP tour you can view 2 of the DMC's out on the back parking lot. One is cut in half (pt2) for certain angle shots in the movie and there is one they used in BTTF 3. and is in bad shape. As far as engines fitting? the rule in the movie biz..is... MAKE IT FIT & WORK!! A total of 7 cars where used. Well i hope this helps, "probably doesnt..." Have a good day!! :) --- In dmcnews@xxxxxxxxxxxxxxx, "John Dore" <dmcjohn@xxxx> wrote: > Hey Bob, > I don't think they used anything but original DeLorean engines in > the cars right throughout the trilogy... In BTTF3, when Marty is > going from 1955 to 1885, the car drives over the camera so you get a > view of the undercarriage, and in one of the frames you can clearly > see an original DMC oilpan, suggesting they stayed with the original > engines.