Exhaust gas flaps Pierburg

This article draws on Pierburg PI 1649 service information

Exhaust gas flaps are an important element in modern engines for emission control and increased comfort. They direct the exhaust gas into diff erent exhaust tracts depending on the operating state. Stricter legal requirements governing the control of emissions, in particular, mean that exhaust gas flaps are increasingly being used close to the engine in series production:

• DeNOx catalytic converters
• Low-pressure exhaust gas recirculation
• HC adsorber

Further possible uses:

• Acoustic optimisation of the exhaust tract (e.g. cylinder shut-off)
• Improvement in performance due to resonance eff ects
• Reduced noise
• Use in the heating system
• Register turbocharging

Load profile:

• - 40 °C to 950 °C gas temperature
• External tightness: max. 1 l/min (at 20 °C, Δp = 300 mbar)
• Internal tightness: max. 30 kg/h (at 20 °C, Δp = 300 mbar)
• Installation location: close to the engine, in the underbody area, not splash-proof
• Durability: 1,000,000 working cycles 

Example: Optimising the acoustics

For this application, the sound waves must be superimposed in the exhaust tract so that they wipe each other out (noise reduction) or amplify each other. 
Retrofi t in Ferrari 360

Example: Register turbocharging

With register turbocharging, one turbocharger is optimised for low to medium engine speeds, the second for medium to high engine speeds. The exhaust gas flap controls the exhaust gas supply to the relevant turbocharger. 
Register turbocharging (schematic)

Universal use exhaust gas flaps (pneumatic)

Pierburg no.	Height	Width	Flap ⌀	Inner ⌀	Outer ⌀	Connection angle	Tube angle	Zero position	Comment
	A	B	C	D1	D2	R	F	(Unpressurised)
7.00509.03.0	133,5		60		–	180°	90°	Open	Without actuator
7.00509.05.0			60	63.4	–	180°	90°	Open
7.03204.01.0	141.5	121.15	48	52.8	–	270°	90°	Open	With end tube, see Fig.
7.22469.06.0	149 1)	114.7 1)	47	–	2)	63°	90°	Open	3)
7.22525.50.0	133.5	137.2	60	63.4	–	180°	90°	Closed
7.22825.03.0	159.8	167.5	71	71	76.1	180°	-17°	Open	Thin-walled tube (3)
7.28153.16.0	128.9	124	52	55.6	56	153°	90°	Open	3)

All data in mm:

1. Dimensions in flap area 
2. With end tube: Inlet side Ø 48.1
3. Available for delivery until exhaustion of stock, please check availability

Dimensions

 

Exhaust gas flap 7.22469.06.0 withextended connecting tube

A vacuum is required to operate a pneumatic exhaust gas flap (e.g. from the intake manifold or a vacuum pump). We recommend an electric switchover valve for the actuation (see fig. Exhaust gas flap 7.22469.06.0). 

Motorservice off ers a wide range of electric switchover valves, such as:
7.02318.01.0 - Connection: Junior Timer 2-pin or EV1 
7.28098.04.0 - Connection: RD clutch 

Electric switchover valve

Vehicle-related exhaust gas flaps (electrical)

	A Exhaust gas flap with exhaust pipe (complete)	B Separate exhaust gas flap as replacement, i.e. the old exhaust gas flap must be separated from the tube and the new exhaust gas flap welded on		C Electric drive module of the exhaust gas flap as repair kit
Vehicles	Ref. no.*	Ref. no.*	Pierburg. no.	Ref. no.*	Pierburg no.
Renault	14 72 506 83R	14 7B 074 24R	7.03571.16.0	14 72 532 72R 14 72 538 28R 14 7B 057 25R	7.03083.20.0
	14 72 532 72R
	14 72 582 71R
	20 01 089 45R
Mercedes Benz	A 176 490 06 81	-		-
Nisan	20010-BB60A	147B0-8010WW		-
	20010-BB60B
	20010-4EA3A
	20010-4EA3B
VAG	-	1K0 253 291 J	7.01300.24.0	-	-
	5Q0 253 101 AG	5Q0 253 691 F	7.03608.16.0	5Q0 253 692 5Q0 253 692A	7.07696.00.0
	5Q0 253 101 AJ
	5Q0 253 101 AN
	5Q0 253 101 AD
	5Q0 253 101 AC
	5Q0 253 101 AF
	5Q0 253 101 AG
	5Q0 253 101 AH
	5Q0 253 101 AM
	3Q0 253 101 AS	3Q0 253 691 F	7.04709.13.0
	3Q0 253 101 QX
	3Q0 253 101 PX
	3Q0 253 101 MX
	3Q0 253 101 RX
	4G0 254 400 GX
Mazda	-	S550-13J40	7.05662.07.0
Perkins	-	3629021	7.04209.06.0	-	-
	-	2629023	7.04210.06.0	-	-

* The reference numbers given are for comparison purposes only and must not be used on invoices to the consumer.

Universal use exhaust gas flap (electrical)

PIERBURG no.	Height	Width	Flap Ø	Outer Ø	Tube angle	Zero position	Comment
	A	B	C	D	F	(De-energised)
7.04174.01.0	166.8	133.3	57.8	77.2	90°	Open

The electrical exhaust gas flap 7.04174.01.0 is infi nitely adjustable in the entire adjustment range between open and closed. A noncontact sensor provides feedback on the flap position.
Position control electronics are not part of the exhaust gas flap. A separate control unit (H-bridge DC engine) is required for application-specifi c actuation. In this case, please contact our Product Management team. 

Pierburg 7.04174.01.0

 

Dimensions, plug assignment and wiring diagram

1. Sensor power supply (+5V)
2. Sensor signal output
3. Sensor earth
4. Engine power supply DC-
5. Engine power supply DC+

Exhaust gas flaps on the motor bicycle (externally electrically controlled)

The exhaust gas flap in the motor bicycle

• reduces the flow area in the low to medium engine speed range for increased dynamic pressure. This increases the cylinder charging and therefore also the torque.
• by releasing the full tube cross-section in the upper engine speed range for maximum performance and sporty sound. 

Manufacturer	Ref. no.*	Pierburg no.
BMW	18 12 7 718 415	7.01796.13.0 1)
	18 12 7 710 883
	18 12 8 521 881	7.01947.12.0 2)

1) Separate exhaust gas flap as replacement, i.e. the old exhaust gas flap must be separated from the tube and the new exhaust gas flap welded on.
2) Exhaust gas flap with exhaust pipe (complete)

 Pierburg 7.01796.13.0

Pierburg 7.01947.12.0