how do you do this?
thanks

 

Hmm, no one knows?

 

It's all in the FSM. Use feeler gauges, clearance the apex seals to the slots, the side seals to the corner seals, the apex seals to the corner seals. You also want to check eccentric shaft endplay and verify that the rotor housings arent warped.

You'll need a metric dial indicator for the endplay as well as a set of slide calipers for the rotor housings.

You can get the dial indicator, feeler gauges, and some other great stuff here:

http://www.pineappleracing.com/index...TS&Category=20

 

What clearance are you talking about? There are several.

 

i am talking about grinding material off the rotors for high power and high revving applications

 

There's some info about this on the nopistons forum in the engine building section.

 

Here you go. Straight from racing beat.
Rotor Clearancing


A second concern for rotors used near or above 8,500 RPM is the clearance between the sides of the rotor and the side housings. The construction and assembly of the rotor and rotor gear is such that both sides of the rotor have a portion, referred to as the “land”, that protrudes out from the rotor “side” several thousandths of an inch. For measuring purposes, detailed below, the “land” on the side of the rotor containing the rotor gear is the face of the rotor gear itself. The “land” on the opposite side of the rotor is the circular portion of the rotor surrounded by the inner oil seal. These features need to be taken into consideration when clearancing the rotor.


The first step in preparing a rotor for clearancing is to measure the thickness of the rotor housing being paired with the rotor at eight evenly spaced points to determine the minimum or narrowest point of thickness of the rotor housing. This minimum thickness becomes the “base line” for the calculation process.


Now, measure the thickness of the rotor and rotor gear assembly at three different points from the “land” on one side to the “land” on the other side. Select the maximum, or widest, thickness of this assembly and subtract this number from the base line number previously obtained. We have found that the following clearances work well:


Clearance between side housings and rotor maximum “land” width:
12A Engines (.009” +/- .001”)
or 13B Engines (.010” +/- .001”)

“Land” protrusion from rotor side: .0055” +/- .0005” (each side). This “land” clearance is obtained by machining away material from the “side” of the rotor, thus leaving the “land” extending from the rotor “side” by the specified amount.

It is entirely possible, based on the production tolerances we have seen over the years that you may need to remove as little as .001” to. 002” from each surface to achieve the recommended clearance. In other words, some of the clearance required already exists

 

We have ability to do this for you. Contact me if you need the service.