Porsche 912E 76 Operating and installation instructions

The

Porsc

912

The techni

spec

ifications are

follows:

Capacity: 1971 cm3

Stroke:

Bore:

Horse power:

developed at:

Torque:

develo

ped

at:

hp/64

4900 rpm

Ibft/133

4000 rpm

equipped

with

... a 2

Itr

., 4 cylinder engine (similar to that in the

Type

This

motor

has

been

fitted

with

the electronically controlled AFC fuel injection thermal reactors

and

exhaust

gas

recirculation.

· . . a 5

speed

transmission

(based

on transmission

type

915)

with

modified transmission ratio

and a newly designed clutch operation mechanism.

a like the 911, a dual-circuit brake system,

disks brakes

without

"inner

ventilation"

bodywork

similar

the 911

but

with

permanently

fixed rear side windows aswe

other

minor

changes.

ENGINE

CRANK

CASE,

CYLINDERS,

ENGINE

MOUNTS

The crank

case

and the cylinders

are

the

same

in the engine

type

914/2

.0 Itr.

The following

new:

The engine mount.

consists

a swung steel bar which

secured

the

motor

in the

same

way

in the 914.

The mounting points on the

chassis

were moved outwards

the wheel wells however.

Warning:

installing the

motor

mount, note that the casted in part number (arrow)

pointing toward

rear.

CRANK

SHAFT

DRIVE/PISTONS

All

parts

the crank shaft drive

are

the

same

in the basic motor.

additional fan-belt

pulley

fitted

drive the secondary air pump. It

secured to the

front

the air intake housing

means

thr

ee-armed block and

driven by

means

a shaft

from

the center

the cooling fan.

COOLI

The

eng

ine sh

tmetal w

changed

conform

the

911

engine compartment configuration.

FUEL

SUPPL

The

912

fitted

with

80 Itr. (inc!. 8 Itr. reserve) fuel tank.

The fu

pump

is mounted on the

front

axle auxiliary mount.

The fuel

filter

is the

same

in the CIS injection

secured

the l

eft

-h

and wheel well in the

engine compartment

) Fuel

tank

2.)

Fuel

pump

) Fuel

filter

4.)

Pressure

regulator

Injection

valv

6.)

Cold start

valve

ECTRONIC

UEL

INJECTION

AFC

The Porsc

912 E

equipped

with

motor

that

has

aair

flow

controlled electronic fuel injection.

Before we describe this

unit

in detail, a few words about the accelerator cable.

The

accel

era

tor

cable

two

parts.The connector (arrow)

located

within

the engine compart-

ment behind the rear panel

and

accessible when the cover

the guide channel

removed.

Construction

and

funct

ion of the

ATC

injection

The component parts

1 Fuel Tank

2 Fuel Pump

3 Fuel Filter

4 Cold Start Valve

6 5 Fuel Injector

Pressure

Regulator

Auxiliary

Air

Regulator

Throttle

Switch

Air

Filter

Temperature

Sensor

Battery

Ignition Switch

A Int

e-air

Sensor

Throttle

valve

Air

Sensor

Flap

ntrol Unit

Principles

Operation

The amount

fuel

that

used

determined

the volume

intake air

and

the

speed

the

motor.

The injector sequence

determi

e igni

tion

dis

ibu

tor

breaker points.

The fuel required

for

cold starting

injected by the electro-magnetic cold start valve.

Warm-up

richment

fuel

mixture

via the

xiliary air regulator in conjunction

with

the

temperature s

ens

or I in the intake-air

r housing and t

temperature sensor II in the cylinder

head.

Fuel mixture enrichme

for

full

load conditio

throttle

switch.

ELECTRONIC

FUEL

INJECTION

AFC

Description

Intake-Air

Sensor

The intake-air sensor

located

the engine compartment at the right-hand side between the air

filter

and the

throttle

housing (L) .

Construction

Aluminum

housing (A)

with

Bye-pass channel (5)

and

Adjustment

screw (6)

Air

sensor flap (1)

with

Back pressure valve (8)

and Damping vane (2)

Damping chamber (7)

Return spring (9)

Potentiometer (B)

with

Pump contacts

(C)

Temp

era

ture sensor I (D)

Operation

The volume

air that the

motor

can

draw in

determined

the position

the thro

ttle

valve.

The resultant air

flow

causes

the sensor flap

deflect against the return spring. T

flap deflection

transmitted via a shaft

the potentiometer which supplies a specific voltage

the con

trol

unit. The

temperature sensor I

connected

the potentiometer and influences the control signal volta

ge.

The injector which

activated by the control

unit

injects

exact amount

fuel appropriate

the

volume

intake-air.

The damping vane

designed

minimize sensor flap hunting. The

function

follows:

with

deflection

the flap the damping vane

forced

into

the damping chamber. The resultant compressed

air

within

the chamber

can

escape

only

through the

release

slit

(S)

. Sudden movements

and

hunting

thereby reduced.

A fraction

the air intake

detoured around the sensor flap via the bye-pass channel. The fuel-air

mixture

for

idle

can

set

means

the adjusting screw (6).

A pump contact

located

within

the potentiometer.

When

the sensor flap

deflected open the pump

contact

closed and the fuel pump started.

Probl

condition:

Motor

does

not

start;starting

dif

ficulties;

low

efficiency.

Troubleshooting:

Remove the plug connected

the potentiometer on the intake-air sensor. Connect

ohm meter

between the contacts 6 and

value: 200

400

Mea

sure between contacts 7

d 8.

Nominal value: 120

200 7

---

---.------.

ELECTRONIC

FUEL

INJECTION

AFC

Throttle Switch

This switch provides the control

unit

with

necessary

information

for

mixture

enrichment and

full

load

cond itions.

not

necessary

adjust this switch.

Problem

condition:

Low

engine power

Troubleshooting:

Disconnect the wires

from

the switch and connect

ohm meter between contacts 3 and 18.

Slowly

open the

throttle

valve. The resistance must change

from

Ignition Distributor

The ignition

distributor

provides the control

unit

with

information

concerni

the

speed

the

engine (rpm) and sequen

for

activating the fuel injectors.

Operation

In addition

livering impulses

the ignition coil,

thecontact breaker points

also

supply impul

ses

econtrolunit.

Each

impulse (1)

converted

squ

are wa

(2)

within

the

control

unit

. These

uare wave impulses are then presented to a gate (3)

whichprovides asingle

Ise

output

for

each

sequ

ence

four

input

Ises

which are the

resu

volutions

the

motor

crank shaft. That

is,

ollowi

each

revolu

tion

thecrank shaft all

fuel injectors

hav

e received

tivat

ing

impulse (5

Thus the fuel injectors inject a de

fin

ite

amount

fuel independent

from

the position

e air sensor flap. The injected fuel

always half

the amount necessary

for

the correct fuel

mix

ture. Si

nce

the crank shaft turns

for

each

cycle,

two

injector sequences

are

put

into

operation

thus

each

cylinder receives the

full

amount

fuel

for

each

firing stroke.

Zyl. 1

l.4

Zyl.3

Zyl.2

1 breaker

pulses

--t-

2 imp

shaper

3 frequency

ivid

4 air

flow

senso

fla

p position

(pot

entiom

eter)

injection i

mpul

(duration

injection)

ion

compressi

ign

ion

exhaust

o crankshaft angle

360

control

unit

lectronic)

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