Originally Posted by Treffynnon
Make sure you put good spark plugs in the motor before you fit it as they are a real pain to get to once it is shoe horned in.
Good point, in fact do any engine work you need to do before it goes in, like belts/waterpump. maybe even a rebuild.
Don't know how much you know about the 4wd system so apologies if you already know this stuff...
The P4 has a different shaped petrol tank to the 2wd to accomodate the diff so i doubt you'd be able to use the standard sprint one , and the exhaust routes differently too so you'd probably need a custom one made up.
Also i think it would be important to make sure the prop runs as straight as possible to avoid putting excess strain on the UJs. The prop length is slightly adjustable vis the rear prop so hopefully this won't be a problem.
You need a second switch on the brake pedal as the ecu needs both signals to keep the 4wd engaged, under braking the ecu disconnects the EMC to avoid excessive strain on the system so the second switch is there so you know if the main switch has failed. You could feed both signals from the one switch but if it does fail it could have severe consequences for the 4wd system.
In fact if you PM me your e-mail address i can send you some 4wd info that i got from another very helpful member.
Personally i think the feel of 4wd is worth all the disadvantages, before the engine broke i had to disconnect the prop on mine due to a worn UJ and even though the 2wd was smoother and seemingly nippier it just didn't feel as good as 4wd.