SMG/K FA20 T=0.7

STOPPER TYPE HEAD GASKET | TOYOTA | Explanation of the product | Application chart |
TOYOTA |
![]() | Code No. 23001-AT003
|
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> t=0.7mm for Supercharged Engine
The t=0.7mm type utilizes a stopper taller than the t=0.5mm type to provide higher bore seal durability. With a stock pistons, the compression ratio is reduced only by 0.1; it allows to maintain high heat efficiency.
Compression Ratio
Stock Thickness: t=0.6mm (ε12.5) HKS Thickness: t=0.7mm (ε12.4)
<POINT-2> 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-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
Engine | Thickness (mm) | Compression Ratio | Bore | Code No. | Price | Remarks |
---|---|---|---|---|---|---|
FA20 | 0.7 | ε=12.4 | φ89.5 | 23001-AT003 | For supercharger engine, LH/RH each, opposed bead stopper type |
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