Did someone say V-3 kit, almost done
My last installment had me and my Datsun mechanic buddies trying to decide where we were going for lunch while checking out all the chic professional ladies in our downtown neighborhood. But - after lunch and a visit to the stereo store we eventually had to get back to those 73-74.5 Z car induction systems.
Between the time the Nissan engineers left our dealership and the kits became available wasn't too long but until that happened the first blush of 73 Zs had to sit on the dealer lots and at the ports. They took up space and more importantly they took up floor plan $s. When all was said and done the the best the V-3 kit could do was make most of the affected cars drivable when the air temp was below about 80 or so and the humidity wasn't too high.
Over the following 2.5 years Nissan issued service bulletin after bulletin trying to get a grip in what was becoming a real problem. In the end they issued more service bulletins on this induction problem than any other system on any other model I was involved with in my almost 10 years of dealership employment. Sometime in 74 the engineering dept. put all of the bulletins in one volume. I had never seen the compilation book until several years ago when I was able to snag one from e-bay. Among the many modifications listed is the one I find to be the most radical, and the most amusing. It was authorized for use only in those parts of the country that had very hot humid climates. It was the installation of a massive hood scoop! Now, before you, a dealer, could cut up your customer's hood you had to have permission from just about everyone from Mr. K on down! I have that book somewhere but I just can't find it. I've included a couple of pictures of the the interim attempts to organize the bulletins. I've never seen one of the hood scoop cars.
There was one factory modification I was able to use with modest success but to this day I can't understand how it was legal. You simply attached a length of vacuum lose to the end of the float bowl vent. You secured the end of the hose using rather fine stainless wire. You then ran the end of the hose to a space away from the venturi. No more partially vaporized fuel being directly ingested by the carbs.
Next time - the final cure, my observations and opinion.