NRSRotorsports

* Length- (13B) 3.1445” +0.0005” –0.000”
(12A) 2.7520” +0.0005” –0.000”
* Height- 0.0360” +0.000” -0.002” to outer spring step
* Thickness- (3mm) 0.1155” +0.0005” -0.000”
(2mm) 0.0755” +0.0005” -0.000”
* Weight- approx 5.5 grams per piece (3mm 13B)
* Outer spring length- stock 3mm 13B
* Inner spring length- stock 13B cut to fit
* 2mm springs are 3mm springs modified to 2mm width

The 13B seals have an overall length of 3.1445" +0.0005" -0.000". So there will be a clearance of 0.0055" (0.1mm) -0.0005" (0.0125mm) + 0.000"/mm with respect to a dimensionally perfect housing (3.150”). Generally even new Rotor Housings are 0.0005” to 0.0015” under the perfect dimension, therefore a housing that is 0.0015” under will still have 0.004” overall clearance (ample for high boost applications).

The 12A seals have an overall length of 2.7520” +0.0005” –0.000”. Additional clearance is required for 12A turbocharged engines. It is possible to customize seal lengths based on accurate measurements of the rotor housings, minimum thickness area. This will be somewhat more expensive due to additional set-up on a small quantity, however it is highly recommended when using large amounts of boost due to the increased heat.

Each seal is meticulously inspected and detailed before it ever reaches the market.
Here is an outline of the process:

* Machined as non-aggressively as possible ensuring minimal damage to the ceramic seal surface.
* Machined with longitudinal striations (machining lines) where possible, maintaining maximum fracture toughness in all directions.
* Tested for fractural imperfections using a level 4 Fluorescent dye-penetrant used in nuclear testing applications (see picture bellow).

Procedure in accordance with ASTM 165 liquid penetrant inspection method. AITEC quality assurance manual ISO 9002: 1994. Personnel qualified by independent examination to: Can/CGSB II 48.9712 2000, ISO 9712, which is equivalent to the American standard: ACCP, ASNT (American Society for Non-Destructive Testing) Central Certification Program. Microscope inspection follows if necessary.
* Upon completion of inspection are exposed to an oxidizing atmosphere, which oxidizes the surface resulting in increased strength by reducing stress incurred in machining. This process reduces sharp edges slightly and gives a super smooth surface with a cloudy or milky appearance rather than a glass like appearance.