Information Regarding Sport Purpose Porsche 911

These are Excerpts from pages 1 – 14 of the “Information Regarding PORSCHE Vehicles Used for Sports Purposes”  The intention is for copy paste of quotes, clarification, references to projects or attached photos.

Information
Regarding
PORSCHE
Vehicles Used
For Sports
Purposes

911 911L 911T 911S

Clutch

Lightened flywheel and
Strengthened clutch for racing use.

Reinforced engine mounts.

Oil level and oil pressure gauge.

Competition Kit 1 included loose (installation will give
Approx. 10 bhp additional engine power),
5-speed gearbox with ratios:
11:34, 18:34, 22:29, 25:26, 29:23
Rear axle ratio: 7:31

Chassis:

Stabilizers front and rear 15/15 mm (0.591/0.591?).

Koni shock absorbers
Air cooled brake disks
Dunlop tires ? SP CP 57 ?C?
Lowered chassis,
Unpolished aluminum rims

In addition to the following parts can be ordered with the new car:

Gearboxes with non-standard ratios
These are fitted with sliding shaft      (additional which permits changing of all pinions   charge)

Kit No.

9591   HILL CLIMB
12:34, 17:34, 20:32, 22:29, 23:28

9592   AIRFIELD CIRCUIT
12:34, 18:34, 21:31, 32, 28, 25:26

9593   NURBURGRING
14:37, 20:32, 22:29, 25:27. 27:25

9594   SUSTAINED HIGH SPEED RACING
15:36, 20:32: 23:28, 26:26, 28:23    (Additional Charge)

9499      100 liter (26.4 US gal./22.0 Imp. gal.) Tank
9574       Limited slip differential

9210   Spare parts pocket fitted on inside of front partition
9521      Rear towing hook
9561      Front stone guard
9562      Stone guard for engine and gearbox
9563      Footrest
9554      800 watt alternator
9228      Rear stabilizer 16mm (0.630?)
Instead of 15mm (0.591?)
9535      Roll bar

Prices for delivery in W. Germany _ Added Value Tax

Only for 911 L:    (with the 911 T included in the Rally kit)

Kit No. 9541   Soundproof undersealing deleted (10kg = 22 lbs)

Kit No. 9542   Soundproof matting deleted (15 kg = 33 Ib)
(no price increase or reduction)

For vehicles wich will be used for competition purposes
you will find in the subsequent text instructions regarding parts
and recommendations for increasing performance.

NOTE

These modifications may put the vehicle outside the licensing
Requirements of the individual local authorities which will mean
that it can no longer be used in public traffic.

1.   INCREASING ENGINE PERFORMANCE

The operations and suggestions which follow do not constitute instructions for carrying out work to produce the increased performance, but are merely a summary of operations and parts for performance increase.

To carry out this work a great deal of experience and practice is necessary in addition to technical skill.  We should like therefore to expressly point out that this work should only be carried out by the proper engineering personnel.

The ideal basic type for competition engines is the Type 2000 engine which is homologate in the 911 S and 911 T in Group 3 ? GT Cars up to 2000 cc ? and the Type 2000 R engine is homologated in the 911 L in Group 2 ? Touring Class Cars.

Before starting work for increasing performance one should decide for what purpose the engine is to be used.

1.   As a general use purpose engine which to be used only now and then in small competitions but will otherwise be used in normal road traffic.

2.   As a rally engine.

3.   As a racing engine which will be used for racing purposes only.

1. General purpose engine for occasional competition use

Here the limit is set by the fact that the engine will also be used for normal road use and extensive performance increase will be uneconomical.

a)   911 T and 911 S  (GT Group 3)

We recommend that the engine be fitted with competition Kit II which is available under Part No. 901.100.907.00 and will give about 15 bhp additional power.

This competition kit can also be fitted for normal use with the standard exhaust system, i.e. the engine is driven normally with the standard exhaust and will be fitted with the racing exhaust included in the kit only for use on closed circuits.

This engine with approx. 170 bhp (standard exhaust) retains the characteristics of the standard 2000 S engine, i.e. the risk of fouling the plugs in town traffic is hardly any greater.

The Competition Kit for this engine is classified in German with the standard exhaust for factory installation in the 911.  In the event of subsequent installation the modification (in Germany) must be reported to the licensing authorities concerned.

b)   911, 911 L (Touring Cars Group 2)

Here we recommend installation of the 150 bhp rally engine which can be used in public traffic.

The engine compiles with the requirements of the regulation for Group 2 Touring Cars and differs from 130 bhp engine of the 911 L in the following respects:

Camshaft of 2000 S engine
Pistons of 2000 S (give higher compression)
Competition clutch

Carburetors are Weber 40 IDS 3 C/3 C 1 with the following settings:

Main venturi                34 mm dia.
Main jet                      135
Compensating jet          185
Idling jet                     55

The valve timing as with the 2000 S.
Ignition setting: 30 deg BTDC at 6000 rpm.

Externally the 2000 R engine differs from the 2000 and 2000 engines in that it has a black air intake and Weber carburetors of type 40 IDS. (The 2000 engine has a black air intake and Weber carburetors of type 40 IDA. The 2000 S engine has a red air intake and Weber carburetors of type 40 IDS.)

For the 2000 R engine there is a competition kit which gives approx. 10 bhp additional power: it may not be used in public traffic.

901.100.923.00       Competition Kit for 150 bhp Rally engine
Consisting of:

901.100.978.03   Main jet 145
901.108.820.00   Cover plate (2)
901.107.083.00   Oil collection tank    (1)
644.628.981.00   Retainer strap  (1)
901.107.394.00   Breather hose  (1)
901.107.656.00   Fixing bracket (2)
900.075.015.02   Hexagon bolt M 6 x 20 (2)
900.027.014.01   Spring washer B 6    (2)
900.076.010.02   Hexagon nut M 6 (2)
901.111.153.00   Bracket for outlet pipe (1)
901.111.193.00   Seal (2)
901.111.035.00    Outlet pipe, left (1)
901.111.036.00   Outlet pipe, right (1)
900.027.015.01   Spring washer (4)
900.075.078.02   Hexagon bolt M 8 x 15 (4)

2. Rally engine

For rallies the most suitable engine is one which in addition to high power output also has good torque characteristics in the lower engine speed range.

In addition, a rally engine should be impervious to the most varied conditions (loose stone surfaces ? concrete road, mountain passes ? differences in elevation, heat cold, damp and dry weather).

Because a racing engine cannot fulfill or can partly fulfill these conditions, which the rally engine one should be content to forego a few extra bhp in the interest of long life and imperiousness to conditions.

On the rally engine (the basic engine is the 2000 S for Group 3 (911 T/911 S) and the 2000 R for Group 2 (911/911 L) the following work can be carried out:

1.   Fitting of a competition clutch with lightened flywheel and thrust plate with increased trust pressure.
2.   Polish and line up inlet manifold.
3.   Polish inlet ports in cylinder head.
4.   Lower valves.
5.   Increase compression ratio to 9.9:1 (on 2000 engine)
6.   Fit Competition Kit 1.
7.   Fit competition exhaust.

Note:

No general operating permit is available for these engines and they must be approved for use in public traffic under Article xxxx of the Road Traffic Law by the Technical Examination Institute or a special operating permit according to the requirements of other countries must be obeyed.

3.   Racing engine

This engine, which in its basic form delivers high power output, can only be used for racing purposes.

All engine components are designed to give peak power output or output in the top engine speed range in accordance with FIA regulations.

The following engine parts can be used for the high performance engine (basic engine 2000 S):

a)   911 S and 911 T GT group 3

1.   Carburetors  type 46 IDA ? 3 C/ 3 C 1 –

These carburetors give better cylinder filling in conjunction with the following parts.  (Standard equipment on 911 R and Carrera 6).

2.   Larger cross-section inlet manifolds –

These inlet manifolds are homologated and are necessary for the above mentioned carburetors.

3.   Carrera 6 camshafts –

As the camshafts in Group 2 and 3 are not restricted, these Carrera 6 shafts can be fitted to the 2000 S engine.  They give, by virtue of increased overlap (?wilder? valve timing? and increased valve lift.  Improved filling and increased power in the upper engine speed range.  (For comparison, see Table of Camshafts, p. 15)

NOTE:

The Carrera 6 camshaft is lubricated by an oil hose through the chanin case, the camshaft of the 2000S engine is lubricated via the camshaft housing   Conversion is possible.

4.   Titanium con rods –

These con rods are lighter in comparison with the steel con rods and are much tougher.  They give therefore a lower loading on the bearings and the crankshaft.  In addition the acceleration masses are reduced.

NOTE:

The titanium con rods are only homologated in the 911 T, not in the 911 S.
5.   Carrera 6 pistons

These pistons give a higher compression and in addition have larger recesses for the valves.  It is necessary when using the Carrera 6 camshafts.

CAUTION:

These pistons should only be fitted in conjunction with light alloy cylinders and therefore only available as spares together with the corresponding cylinders.

6.   Exhaust system

For the racing engine the most suitable exhaust system is the complete one fitted to the 911 R.  Installation is basically possible, but some modifications must be made.

7.   Plugs

BOSCHE W 265 P 21 spark plugs must be used with engine.

8.   Oil collection tank

As oil collection tank must be fitted in the right corner of the engine compartment to take the xxxxx hose.

9.   Clutch

A reinforced clutch must be fitted for the increased engine power:  this is available as a replacement part with a lightened flywheel.

10.   Cylinder head

The inlet and exhaust ducts must be aligned with the inlet manifolds and exhaust flanges and polished.

To achieve as large an intake and exhaust cross sectional area as possible, the valves can be set lowered in their seats.

To raise the compression to about 10.4:1 the cylinder heads must be planed by .8mm (.0315?).  Another possibility is to turn 0.8 mm (0.0315?) off the cylinders.  (This is the maximum, otherwise there is the risk of the valves hitting the pistons.)

NOTE:

Modified parts cannot be accepted in exchange.

The Carrera 6 camshaft is lubricated by an oil hose through the chanin case, the camshaft of the 2000S engine is lubricated via the camshaft housing   Conversion is possible.


b)   911, 911 L Touring Car Group 2 (Basic engine 2000 R)

1.   40 IDS 3 C/ 3 C 1 Carburetors

These carburators are fitted as standard equipment on the 2000 R and 2000 S engines and should be set as follows:

Venturi      34 mm dia.
Compensating jet   185
Main jet      145
Idling jet      55

Install carburetor screen plates in place of the air filter.

2.   Intake manifolds –

Machine these to cylindrical cross section as far as possible, polish and match up to cylinder heads and carburetors.

3.   Camshaft

The camshaft (as with 911 S) can be left in its existing form.

4.   Cylinder heads

The intake and exhaust ducts must be matched up to the intake manifolds and the exhaust flanges and polished.

To achieve the maximum possible intake and exhaust cross sectional area the valves can be set lower in their seats.

5.   Cylinders

To rais the compression to about 10.2:1, the cylinder heads must be lowered by 1.0 mm (0.0394?) or the cylinders must have 1 mm (0.0394?) machined off.

NOTE:

Modified parts cannot be accepted for exchange.

6.   Exhaust system

For the racing engine of the 911/ 911 L, cone-shaped pipes must be fitted in place of the standard muffler

7.   Plugs

BOSCH W 265 P 21 spark plugs must be used with engine.

8.   Oil Collection tank

An oil collection tank must be fitted in the right rear corner of the engine compartment to take the breather hose.

9.   Clutch

A competition clutch is fitted to the 2000R engine is standard.

G e n e r a l  (All Models):
Engine support

A strengthened engine support must be fitted to all vehicles when engine performance as been increased.

Generator

For competition purposes there is a generator with increased output  (900 W).  It offers special advantages for rally vehicles because these are usually fitted with several extra lights and additional electrical accessories.

Carrera 6 clutch in the 911/911 S

During the course of the 1967 racing season it was found that the Carrera 6 clutch in the 911 and 911 S has no advantages over the 911 and 911 S competition clutch.  In addition the Carrera 6 clutch has been found from experience not to be as hard working.

We recommend therefore that the Carrera 6 clutch should no longer be used in the 911 and 911 S vehicles for the following reasons.

1.   The Carrera 6 clutch as the same contact pressure (about 600 kg ? 1325) as the 911 S for the following reasons:

2.   The drive plate of the Carrera 6 has been matched to the considerably lower weight of the Carrera 6 as compared with the 911 and 911 S and therefore has a lining with a lower coefficient of friction.

3.   The Carrera 6 clutch (complete with flywheel) is only about 1 kg (2.2 lb) light than the competition clutch of the 911 and 911 S.

When working on the clutch it should be noted that the Carrera 6 clutch cannot be fitted to the 911 / 911 S flywheel and visa versa

Engine oil

The general recommendation for the 2000 S engine is SAE 20 brand name HD oil.  For the racing engine however we recommend that Valvoline Racing Motor Oil SAE 40 be used.  This oil can be used for racing purposes in all other 911 engines.

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