Installing the Krankvent from ET-Performance

Wednesday, 27 July 2005

[Editor Note from GRAM: ]  I have used the Krankvent for a number of years now, and have been very pleased with it.  Subsequent to an offer from the manufacturer for a unit to review, I asked Pat to install it on his bike and provide the basic installation instructions below.  It is more expensive than using a PCV valve or an external air filter, but provides some real benefits with regard to endurance and maintaining best head vacuum.

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ET-Performance has adapted thier very popular crankcase vent (Krankvent) for use with the  Roadstar.  A lot of us are currently using PCV Valves or external air filters to provide this functionality when we change out the stock air kits on our bikes.  Some are even using open tubing run to the ground.  Each of these serves its purpose by allowing the excess pressure to be relieved from the heads and crankcase during a normal combustion cycle.  In the stock configuration, this pressure (and its accompaning oil blow by) are vented to the air kit, which sends the air and oil into the carburetor for consumption in the normal air/fuel mix. 

The problem is normal for combustion engines, and occurs in the heads above the valves and below the piston rings in the crankcase.  When the pistons are moving up and down, they are drawing in and expelling air into this "non-combustion" area. Some of this pressure is caused by the normal movement of the piston in its cylinder, some from "blow by" that escapes around the sealing ring of the piston.  This creates a pressure in the crankcase that can sometimes cause seals to leak. It also creates an energy in the form of air pressure that the pistons have to work against.  Every combustion engine needs a way to relieve this pressure for best performance. 

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