Re: [VintageLambo] Re: Smelly Espada

That"s makes 2 of us. I drove my QV in today after taking it to the shop this morning. I had some custom CAT bypass pipes made out of stainless. They turned out beautifully and only 1/4 the price of the Tubi. The sound and power....only "wow" comes to mind. So if you had dumped the PCV to the airfilter boxes, there would be no vacuum. Therefore no draw. However the PCV would pass the blow-by gasses as the pressure built up in the crankcase (maybe slightly pressurized), so in effect it would be a straight pipe. The PCV is supposed to regulate combustion of blow-by gasses while maintaining slight negative crankcase pressure. During idle/light loads, when manifold vacuum is highest, the valve allows very little flow. This is necessary so it doesn"t act as a bypass to the throttle plate. Flow through the valve increases as engine manifold pressure rises (with load). The PCV also acts as a spark arrestor, so if manfold pressure >= crankcase pressure, this will close the valve hard. Another key aspect of the PCV system is fresh air draw into the motor. This greatly enhances oil life by ridding nasty HCs and water vapor that convert into acids. Dennis Jack Riddell wrote: > > Hi Dennis, > > As luck would have it, I drove my 400 GT to work today so I just went out and popped the hood to check the system. You are correct. The hose runs from the breather tube (which is plugged at the opening) to the PCV valve, then to the front of the balance tube on the intake manifold.I went by memory on my earlier post and I should know better at my age! On the other hand, why wouldn"t a connection at the back of the air cleaner box work as well? You have six carb throats pulling air in there. Would that not suck in the fumes from the connected hose? Just seems like it should work. > > Best Regards, > > Jack > > Dennis Briddell wrote: > > > after reviewing the diagram again, I"m a little confused. PCV valves are self regulating and work on vacuum, so the connection should be to the intake manifold, not the air filters, right? As drawn, the valves don"t really do anything, blow by just gets sent to the air intake. Dennis > > > > Jack Riddell wrote: > > > > > > Hi Dennis, > > > > > > Are you referring to an air inlet to the air conditioner motor? If that is the one you mean, the answer is no. The A/C that came with my car is a Borletti system that uses and American compressor (soon to be replaced by a Sanden unit). It uses a pair of squirrel cage blowers driven by an electic motor and simply recirculates the air inside the car. On the other hand, there are two outside air inlets on the 400"s on either side just forward of the windshield that will allow fresh outside air into the cabin area. I usually leave them open until the A/C gets cold then shut both sides. > > > > > > B/R, > > > > > > Jack > > > > > > > > > > > > > > > > > >