If you loose 2 engines after V1, it's just not your lucky day...
V1 is a calculated figure which is giving the relation between ASDA and TORA.
At this specific point (speed vs rwy lenght) the decision Has to be made to either stop or go. Make the decision a few knots before V1, 'cause with the acceleration your initiation may well be later than V1...
Anything later than that and you're committed to go. That's what you briefed in the first place.
Only with a relatively light aircraft and a very long rwy (not limiting)
there's room for improvisation if it's gonna save your asses.
Try EdwardsAFB...
The difficult one is when the problem occures just before V1 but remains unnoticed or the action is delayed until you've already passed the magic number...-> It's now a GO because as per your calculations you Will go off the runway if you try to stop the beast at this point...
It's all in the Boeing FCTM if you have one.
Sorry for being a bit academic, but this stop/go discussion was leading us nowhere...
Guys take care outthere and I suggest you request Rwy 25 for a while when in Bru.
Chrz,