Ok well i have asked about EGR in a previous post i now know what it is (the technical use) but how do i kno if my car has it other then the place where i put the oil in on the valve cover on the opposite side there is a rubber tube from the cover that connects to the back of my carb if that is EGR how would i remove it and what would go in its place a breather???

 

That is your PCV valve , as far as I know

 

well do i need that or what whats the purpose its there a way to modify that to get more power?

 

Removing PCV or EGR will NOT make more power.. no bearing on it. I took it out of my 5.0 engine only because I Need room. Doing this will decrease my fuel mileage.

 

It will also increase the amount of toxic buildup in your crankcase and under your valvecovers, and you could possibly cause oil to blow right out the breather cap if you've got enough pressure in the system.

You get a lot of exhaust gases pushed into the crankcase that need to be evacuated. That's the function of the PCV system; it sucks these gases back into the intake and pulls fresh air in from the breather. Without an operating PCV system, all these gases just sit in the crankcase and combine with engine oil to build a coating of sludge on everything.

 

egr removed will eat the gas milage on a car with one pcv as long as its vented either breather or pcv its fine.jerm your mustang doesnt have a egr its way too old thats a pcv valve yes you can replace it with a breather make sure it baffled tho. pcv stands for positive crank ventilation the engine block bulds up pressure the pcv valve takes that pressure and dumps it in the carb/intake its part of smog a breather will work fine too. read this http://en.wikipedia.org/wiki/PCV_valve heres a egr http://en.wikipedia.org/wiki/Exhaust_gas_recirculation same thing as a smog pump but on newer cars with efi.

 

It's only a minor part of smog:-| Theintended purpose is to evacuate those exhaust gases. Running without a funcitoning pcv is going to result in exactly what I already described: sludge buildup in the crankcase. There is no benefit to removing the pcv system.

The original crankcase ventilation design (found on earlier cars)is a road draft tube that uses moving air flowing under the car to suck gases out of the crankcase. Smog regulations laterrequired thata pcv systembe installed to reburn these gases rather than vent them straight into the atmosphere. The system changed, butthe purposeremains the same.

Leave the PCV installed.

 

I read on here about 6 months ago that the PCV actuall gave you a net HP gain of like 1-2hp, is this because of better lubrication or the higher amount of hydrocarbon fed to the engine?

 

Most likely a reduction in crankcase pressure (or possibly the creation of a slight vacuum there) that offers less resistance to the downward movement of the pistons. Note that upward movement of other pistons will not completely compensate, as the crankcase atmosphere cannot respond quite as quickly as the pistons change direction, and it does take a finite amount of force to move even a few hundred cubic inches of air.

The rubber tube in the other valve cover provides two functions. Under normal conditions (engine in good mechanical condition) it provides filtered air into the crankcase. In order for there to be flow out the PCV there must be flow in somewhere else. The carb air filter is a much better filter than most filtered breather caps, and you really don't want grit to end up directly into the oil or sucked back into the engine through the PCV anyway.

The other function is that under conditions of blowby rates that exceed the flow capacity of the PCV to pass or occur when the PCV is closed (or stuck shut)it provides a second flow path for crankcase fumes to be carried into the intake. In this case, the 'flow in' is the excessive blowby.


Norm

 

Cheers Norm for the answers