Rotary Engine

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  • Topic: Dry sump, Wankel engine, Engine technology
  • Pages : 160 (7734 words )
  • Download(s) : 67
  • Published : February 26, 2013
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This catalog has not been updated since 1996, except for some minor editing to correct some part numbers or show items which are definitely no longer available. Any numbers which are
still available, would still be good in this catalog.
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R OTARY E NGINE

Competition Apex Seal Information
Engine — Rotary

Carbon apex seals and Iannetti Advanced Carbon seals are recommended for any engine that will see 8000 rpm and above. They weigh significantly less than the stock (cast iron) apex seals and provide lower mass, keeping the apex seal in contact with the rotor housing face at high rpm. At high rpm, the stock (cast iron) seal overcomes the spring, causing the seal to skip across the rotor housing surface, reducing engine performance. Cast iron seals also can warp at high rpm.

Iannetti Advanced Carbon Apex Seals
Design
The two (2) spring design allows for a higher spring pressure which helps improve chamber sealing. This design feature allows the engine to be run with a higher degree of timing before “ TDC,” retarding the onset of pre-ignition or detonation and effectively increasing the engine’s horsepower capabilities. The insignificant wear characteristics of the material allows the use of almost double the apex spring pressure than could be used with other stock or carbon apex seals. This capability also contributes to better sealing, thereby improving the containment of the combustion chamber pressures, which in turn, assists in preventing the onset of detonation.

Material
The apex seal material exhibits the following qualities: high strength, low friction and lightweight (lower than ferrous-based seals).
Recent material composition improvements have been made, especially in the case of the 2 mm Iannetti apex seal used for turbo applications. The Iannetti 2 mm seal can handle over 50% more stress on the apex seal beam cross-section than the 3 mm stock seal for normally aspirated 13B engines.

Benefits
I Provides excellent sealing characteristics at all temperatures I Withstands damaging engine detonation
I Will not absorb moisture when engine is being stored
I Ideal for turbo applications
I Iannetti seals have been used by most major professional teams in the world:

• Winner of the 1994 IMSA World Sports Car Championship,
Wayne Taylor – Team Downing/Atlanta.
• 3rd in Class at the 24 Hours of Le Mans,
1995 - MazdaSpeed – Team Downing/Atlanta.
• 3rd overall at the Rolex 24 Hours of Daytona,
1996 – Team Downing/Atlanta.
• 1st in Class at the 24 Hours of LeMans,
1996 - MazdaSpeed – Team Downing/Atlanta.
E-3

Rotary Engine Components

E-4

ROTARY ENGINE COMPONENTS
PART
NUMBER

1

4352-11-301

1

#
CODE REQ.

0000-01-9101

DESCRIPTION

MODEL/
ENGINE TYPE

YEAR

NOTES

6

Apex Seal, Carbon
(3 mm width)

12A

1974-85 Requires use of competition
apex seal springs.
(Part #4352-11-304)

6*

C

Apex Seal, Iannetti

12A

Engine — Rotary

ITEM
NO.

1974-85 3 mm width - 2 spring design.
Requires use of modified
springs.

Ceramic

(3 mm width)
1

N201-11-300A

S

6

Apex Seal
(3 mm width)

12A

1974-85 Includes side piece.
(Part #1202-11-302)

1

4801-11-301

C

6

Apex Seal, Carbon
(3 mm width)

13B

1974-85 Requires use of competition
apex seal spring.
(Part #ZR03-11-C04;
3 mm width)

1

0000-01-9102

2*

Apex Seal, Iannetti

13B

1974-85 3 mm width - 2 spring design.
Requires use of modified
springs (included).

Ceramic

(3 mm width)
1

N304-11-300

1

S

0000-01-9103

6

Apex...
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