HKS Zylinderkopfdichtung 0.7mm FA20 Bore 89.5mm für Supercharger

Opposed Bead Stopper Type Metal Gasket for the FA20 engine of 86/BRZ provides higher bore sealing durability than a stock gasket. 2 types of the gasket are available. One is t0.5 increased compression ratio type for an NA engine (ε12.6←12.5, Supercharger installable, Endurable approximately 300ps)and another type is t0.7 high engine output type for a supercharged engine (ε12.4←ε12.5, Endurable approximately 600ps with supercharger)

 

 

 

 

■ Feature

<POINT-1> Maintain a high seal with high pressure!

Both types are endurable against high engine output. Stopper structure of the bore seal is separated type so it prevents leakage even under high gas-pressure at high engine output.

 

<POINT-2> 600ps D1 spec is reproduced for a supercharged engine!

The t0.7 type (for an engine equipped with a large Supercharger) utilizes a stopper higher than the stock gasket to provide higher bore seal  durability. It is designed to be endurable against 600ps engine power. Compression ratio was reduced only t0.7 so high heat efficiency can be maintained. Compression ratio of the gasket for a supercharged engine is ε12.4. Its thickness is t0.7. (Stock compression ratio is ε12.5 and thickness is t0.6.)

 

<POINT-3> Contact surface pressure is improved!

Special coating was applied on the head side and cylinder side to improve sealing performance when tightening the bolts.

 

<POINT-4> Bore seal pressure was confirmed in figures. (See the diagram below.)

 

 

(Contact Surface Pressure Measurement)

 

 

(Contact Surface Pressure Measurement)

 

 

(Structure Comparison)

NA　t=0.5

* Comperd to stcok, bore seal is independent and has higher seal surface pressure, 　therefore same amount of stopper, bore seal is stronger. * Thinner than stock and compression ratio is 0.1 higher

 

Supercharger　t=0.7

* Comperd to stcok, bore seal is independent and has higher seal surface pressure, 　therefore bore seal power is much stronger. * Thicker than stock and compression ratio is 0.1 less than stock

 

Stock　t=0.5

* Bore stopper is similar to the other seal and ther surface pressure polymerize, 　it has lower seal ability than the independent type