20 replies to this topic

[liirge]

Cheers guys, this system does look very interesting, Vizzard doesnt go into great detail im not gonna lie,

[AlbertaAMX]

Further Thoughts into this
Would the Following system work..

Questions about it:
1. Would i need to involve the Intake System, as surely the exhaust system always has a vacuum?
2. Would the Exhaust side need a PCV valve aswell as a 1 way valve?
3. Do i need an oil catch tank?
4. If i need a catch tank, where would the best place be to return the oil to the sump, if at all?

That system will work fine. Basically the exact same thing is used in Drag Race / High Performance V8's over here. The higher level of vacuum provided by the exhaust system helps the rings to seal, and the engine to develop more HP. It's an infinitesimal amount however. It doesn't matter that there is back pressure due to the muffler, the shape of the tip that goes into the exhaust creates an extremely low pressure area. The only thing to keep in mind that this system will have nearly no sucking ability at low Exhaust Gas Velocities. That is the reason for the one way valve.

I am going to do this on an engine that I am using in a 76 Mini (Its a 87 ish 1275).

I believe the lack of velocity at low pressure won't matter as if the engine case "Pressures up" it will vent down the line into the exhaust. And when we talk about "Back Pressure" in an exhaust, it's important to know that a high performance exhaust will have nearly unmeasurable amounts of back pressure. A properly designed, straight through or chambered muffler, will not have more than a whisper of back pressure. Plus, when this system is at it's least efficient point, idle, the exhaust will be handling 7 to 900 RPM worth of exhaust gas, through a system designed to flow properly to 5000 or above. I have never measured, but I would be willing to bed there is no back pressure at idle.

My one question though, can I plug the Transfer Case breather with a block off plate and let the timing cover breather do all the work? Or do the breathers serve unconnected areas?

Cranck Case evacuation system.

Edited by AlbertaAMX, 02 June 2009 - 08:01 PM.

[AlbertaAMX]

My one question though, can I plug the Transfer Case breather with a block off plate and let the timing cover breather do all the work? Or do the breathers serve unconnected areas?

Bump???

[liirge]

You running a 1275 or a less?
The breather will reach all areas but only having one on a 1275 will make it overloaded and your crankcase will not be venting properly, increasing wear, oil leaks and lowering performance., but the question is WHY would you want to remove it? its there for a reason...

[AlbertaAMX]

1275 Came without a cranckcase breather on the clutch end. Thought if I could block it off I would. Being I can't I'll make a plate with a fitting and run the line to the T.

[liirge]

Mate, a 1275 really does need at least 2 breathers, you will run into oil leak problems and potentially oil burning. Find a breater from a Scrappy, and attach it up to the other breather with a T-piece and hook the whole lot into the Carb.