rjw

iTrader: (3)

Well , we went with pacesetter longtubes, borla mufflers and no cats.

we are in the process of stripping/painting the headers, removing all the old exhaust, etc.

This will be a true dual exhaust with 3" all the way and some cool tips, hopefully coming out of both sides just ahead of the rear wheels.

If it works out, the pipes will probably be just behind the running boards with a H pipe just after the headers.

Otherwise, it will probably be similar to the stainless works exhaust with the x pipe, but all exiting just ahead of the right rear wheel/

we are also considering an old school evac system sucking from the valley cover.

Our Chilton book states that the valve cover breathers are supposed to intake fresh air , while the valley cover and pvc valve expel excess crankcase pressure, which would be sucked out through the evac one way valve and fitting welded into the right side header collector.no catch can needed and if things work out, a clean engine with zero crankcase pressure and no oil going into the whipple....

thoughts?

rjw

iTrader: (3)

Crankcase Ventilation System Description as per the Chilton manual fwiw

Crankcase Ventilation System Description

A closed crankcase ventilation system is used in order to provide a more complete scavenging of the crankcase vapors. Fresh air from the throttle body is supplied to the crankcase, mixed with blow-by gases, and then passed through a crankcase ventilation valve into the intake manifold.

The primary control is through the crankcase ventilation valve which meters the flow at a rate depending on manifold vacuum. To maintain idle quality, the crankcase ventilation valve restricts the flow when intake manifold vacuum is high. If abnormal operating conditions arise, the system is designed to allow excessive amounts of blow-by gases to back flow through the crankcase vent tube into the engine air inlet to be consumed by normal combustion.

Filtered fresh air is routed from up-stream of the throttle blade to the front of the right and left rocker arm covers via formed rubber hoses. To reduce the potential of oil pullover into the throttle bore area due to back flow of the ventilation system, the fittings in the rocker arm covers are shielded from the rocker arms. From there fresh air and gases are routed through the crankcase and up to the front of the Valve Lifter Oil Manifold where the positive crankcase ventilation (PCV) valve is located. Gases are then routed through a hose to the intake manifold.

Blown06

iTrader: (32)

Seal the motor up completely and vent the crankcase to to open element catchcans only. Pull from both valve covers, decent size line (1/2" or better). Two one quart cans should suffice unless you melt a piston, but its the way to go in a FI combo in my opinion. PCV's are for people who like to keep a little oil mist in the intake charge to help encourage detonation.

rjw

iTrader: (3)

we are going with the old school crankcase evap setup, into 1 header straight from the valley cover...and see what that gives.

btw: headers are on, new true dual exhaust, running just inside the running boards. 3" tubing all the way, exhaust exits just behind the running boards on both sides, h pipe....sounds like a big block, nice burble with the Borla xr 1's, and NO cats....love the sound, so far, no drone except a little at 1k.....

07Softail

Header evacuations systems are only for constant 6-8000 RPM set ups. It won't work very well in street applications.

RT

rjw

iTrader: (3)

I guess I'll find out....lol used them in all my street performance vehicles , but that was years ago. this thing will see 6500 every day, pretty much...

07Softail

It might see 6500 but not all of the time. it's more for a dedicated a Drag Race setup.


RT

rjw

iTrader: (3)

I agree....except at the moment, I am seeing reasonable vacuum, so I have to believe that it will relivee some crankcase pressure, even under daily driver conditions. Plus, the $30 investment might be extremely cost effective as compared to catch cans, also zero maintenance, although not great for the environment.

until the results are in, the investment is minimal and hopefully my intake tract will be oil free.....lol

stay tuned.....

Blown06

iTrader: (32)

No doubt, you're right, but it could provide some benefit as long as he has the tube welded in at the correct angle and has a check valve in place.

rjw

iTrader: (3)

ya, it sucks like a $20 street blower....waaaaaahh