I finally finished assembling my 460 and installed it in my 66 merc,also updated my gallery check it out! cool or what
oh ya my Question the ford racing covers don't have the center top valve cover bolt hole. Anybody have experince with them leaking ? Thanks Eric

 

Put a piece of teflon wrapped rod in the hole flush with the cylinder head and you won't have any problems. How are you ventilating the crankcase?

 

Oh!! As Jackie Gleason used to say..., " How S-W-E-E-T it iz!!... "

 

I am using a crank case evacuation I still need to mill out the holes
in the covers that will happen closer to truck completion Eric

 

May I ask what type? I'm facing that same decision within the next couple of weeks.

I had originally intended to use one of the kits that uses ports in the exhaust header collectors with lines to valved breathers on the valve covers.

Then a racer list I follow listed experiences with that system and pump evac systems. People not driving them wide open all the time were experiencing oil in the collectors with the vacuum method. Even with 3" exhaust sytems from the collectors all the way out the back.

Any experiences or thoughts on this?

Thanks,

George

 

I was checking out a mud bogging truck with vacuum pumps hooked to the valve covers and exiting via a bung welded in the headers.
Will this actually help improve the V.E.(volumetric efficiency) ratio?The owner said it does but I am unclear as to how.

 

I am using the moroso kit I acuatly just welded the pipes in the headers hours before I took the pictures I have not heard of any oil build up I do plan on using the baffles supplied with the valve covers I guess I will discouver If this problem of oil build up is true But hey what a good reason to travel a WOT Eric

 

tellico racing - The kits without pumps are a method of evacuating crankcase pressures and oil/condensation fumes without running them through the intake mixture as with a conventional PCV system. This provides excellent reduction of pressure at WOT, but the issue I'm facing, from other reports, is that the scavage effect from the exhaust isn't completely effective at lower rpms. That will lead to increased stress on gaskets/seals and reduce engine efficiency at lower rpms.

Pumps offer excellent assistance in volumetric efficiency ratio as they scavage all pressure from the crankcase (created by downstrokes of the piston). A valve allows air to enter on the upstroke to eliminate a vacuum effect. By eliminating that pressure, the second ring acts as a wiper on the downstroke, as it should, instead of 'pushing' against the pressure in a compression effort. At high rpms, lack of crankcase evac will create ring flutter on the downstroke. Using an extra .001-.002 gap on the second ring is also advised.

Probably the best example of not having adequate crancase evacuation on a 385 is that they will blow the dipstick right out of the hole at high rpms (6-9000rpm), and you can imagine what's happening to gaskets and seals.

While most truck 385s are built as torquers that max at 4500-5500rpm and blowing out the dipstick out isn't an issue, the ability to avoid putting crankcase fumes into the fuel mixture and relieve crankcase pressure is far superior to conventional PCV systems.

 

That makes sense. Thanks George

 

George
I had a idea about the possibilites of excessive crank case pressure at low rpm using the exhaust method of removing crank case pressure. What about incorperating a pcv system along with the evacuation system at low rpm the pcv system would work and then as the rpm increased the evacuation would take over. I realize that the whole point of the evacuation system is to not introduce crank case gases in the intake mix but for street use this maybe the solution, let me know what you think Eric

 

That would work, but could the remote siphon action of the header scavage be able to overcome the vacuum effect of the immediate PVC system? Or would they fight each other? You're talking about running them both through the same breather? Must be an engineer out there that can tell us.

I still don't want to run the crankcase gases through the induction system.

 

George I agree with you on running crankcase gases in the intake. I was just throwing the pcv Idea out as a possible option, I still plan on using the evacuation kit I purchased and will decide what to do if I experience any weeping seals or gasket due to to much crankcase pressure I have talked to a few local racers and they seem to be not to concerned with the possible oil build problem Eric

 

I'm also going to go with the non-pump evac kit. As mentioned, my big concern isn't so much the oil, but the seals and gaskets. I guess we'll find out.

 

Continuing to beat this subject to death, I've decided to install both collector evac breathers at the front of the valve covers. This was put forth by a 'stang/460 conversion, where there's no room for breathers at the back of either tall FRP valve cover. The owner experiences no oil in the header collectors noted by others who have installed the passenger side breather, and in some cases the driver's side breather, at the rear of the valve cover.

Any thoughts on this?

Thanks.