3.5 up tp 3.9 now slow as hell

Is this the same box that was attached to the original engine and if so, what speeds did it reach at similar revs? Logically, the only thing thats changed is the engine so unless you've accidentally stuck it in low, the speed/rev comparison will be the same.

Thinking about that rev counter - presuming it takes its reading from each spark pulse, isn't the fact that it came from a 4 cyl car going to have an effect on its accuracy, given that its now reading a 8 cyl engine?

Mike.

It is the same box, and it did quite happily get upto 60 mph on the motorway, you are quite correct about the rev counter but I am mainly basing the high rmp from the sound of the engine.

regards

wayne

Fuelling will also be wrong, losing a lot of power, if running with the 3.5 carbs and needles. If strombergs, you won't get suitable needles so fit SU's and replace the needles with, say, BAC's as a starting point. Badger

I have a modified manifold with a weber 38DGAS fitted.

On or around Thu, 28 Aug 2003 08:46:05 +0100, "wayne" enlightened us thusly:

it'll still be wrong for the 3.9, though...

Found the problem! the diff lock was engaged. seems to have rusted up. note to self put light on dash from gearbox switch!!!