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Info EDUARD 06/2023, Page 7
Info EDUARD 06/2023, Page 8
DB 601E
The further improvement in the performance of
the DB 601E engine was not achieved by further
increasing the boost pressure or the octane
rating of the engine. The DB 601E engine actually
reverted to the easier to produce B4 gasoline
with an octane rating of 87. The compression
ratio was 7.0:1 on the left side cylinders and 7.2:1
on the right side, and was thus lower than the
DB 601N. The cylinder bore and stroke were the
same as in the DB 601A and DB 601N, bore being
150 mm and the stroke 160 mm. As a result, the
displacement was also the same at 33.9 l. That's
about all that remained the same. There were
a lot of new and modified parts: a new engine
block, metering pump, boost pressure regulator,
injection pump drive housing and mixture
regulator for the injection pump, new reinforced
connecting rods, rocker arms, connecting rods,
new intake manifold and rebuilt engine cylinders
with larger intake manifold and modified valves.
Using an emergency engine boost pressure of
1.42 atm, at 2700 RPM, the highest output was
1,420 hp (1,440 PS) at an altitude of 2,100 m and
1,331 hp (1,350 PS) at sea level.
Combat power at 1.30 atm boost pressure, 2,500
RPM was 1,262 hp (1,280 PS) at 2,100 m and 1,183
hp (1,200 PS) at sea level.
The development of the new version of the DB 601
engine was long and rather complex, starting
at the end of 1938, with series production of
the zero series of 180 units (later increased to
290 units) beginning at the Werk 90 factory in
Berlin-Marienfeld in the second half of 1940.
Then, in January, production at the Büssing
factory in Braunschweig and Henschel in Kassel
was initiated. When the engines were introduced
into service, they had cooling problems, which
led to a limitation of the maximum permissible
engine power during take-off and climb. There
were also problems with the life of the piston
rings and the bronze valve bushings. There were
also problems with the spark plug cables, which
quickly wore and burned out. For these reasons,
most engines had a service life of only 50 hours,
with few engines reaching 100 hours, which was
a far cry from the expected 100 service hours
to a midlife overhaul and 200 service hours to
a general overhaul. Back in May 1942, during
a joint inspection by the procurator of the
Daimler-Benz company, von Berg and Colonel
Galland (at that time in the capacity of the Fighter
Air Force Inspector-General der Jagdflieger),
a critical situation was discovered for the units
on the Eastern Front, armed with the Bf 109 F-4,
stemming from the unsatisfactory condition
of the engines. Heavy engine wear threatened
to ground a large part of the machines in
operation and significantly reduce the combat
capability of the fighter units. It can be seen
from this that although there was a remedy by
modifying the problematic components, such
as the introduction of steel valve bushings and
vented wiring harnesses, this remedy was time
consuming and engine problems accompanied
the Bf 109F-4 for practically the entire first year
of their service. That is, the entire time of their
front-line service, because in the summer of
1942 the first Bf 109 G-2s with DB 601A engines
were already making their way to Luftwaffe
fighter units.
Coolant Radiators
Due to the anticipated use of the more powerful
DB 601E engine, new radiators were developed
for the Bf 109F and the engine cooling system
Two synthetic aviation fuels
were used in the DB 601 series
of engines. Both were produced
from brown coal by Fischer-
Tropsch. The final mixtures,
depending on the required
type of fuel, were produced
in the so-called WiFo depots
(Wirtschaftsforschungsamt)
according to the requirements
of the individual branches of
the armed forces.
B4 Flugmotorbenzin was
a synthetic gasoline with
an octane rating of 87. It
contained tetraethyl lead and
25% aromatic additives. It was
colored dark blue, and it was
graphically symbolized by a
yellow triangle outlined in
white with the number 87 or
B4 in it. It was the synthetic
equivalent of B2 gasoline,
produced from petroleum.
C3 Flugmotorbenzin was
a synthetic gasoline with
an octane rating of 100. It
contained tetraethyl lead and
45% aromatic additives. It
was colored dark green, and
it was graphically symbolized
by a yellow triangle outlined in
white with the number 100 or
C3 in it. This was the synthetic
equivalent of C2 gasoline,
produced from petroleum.
For a more detailed
explanation of the meaning
behind the octane rating,
please see.
Bf 109 F-4/Z during an oil refill. The aircraft has circular wheel wells, a larger compressor intake and
a VDM 9-12087A propeller with wider propeller blades.
Photo: Bundesarchiv
AVIATION FUELS IN THE LUFTWAFFE
Sudetendeutschen Treibstoffwerke AG Brüx, located between Most and Litvínov in northern
Bohemia, was the third largest producer of synthetic gasoline in Germany and the occupied
territories. Construction of the plant began in May 1939, and the first train of synthetic gasoline
was dispatched from STW Brüx on December 15, 1942. Albert Speer, Reich Minister of Armaments,
attended the opening ceremony. The plant was producing up to 50,000 tonnes of synthetic fuel per
month at full operation. In the last year of the war, after the Allied bombing offensive against the
German fuel industry began, it became a frequent target of Allied air raids, mainly led by the
8th USAAF from Britain and the 15th Air Army from Italy. The first raid on this chemical plant on
8. USAAF carried out on May 12, 1944, and 12 more major American raids followed by the end of
1944. A heavy night raid was carried out by 231 Lancasters of RAF Bomber Command on January
16, 1945, virtually putting the factory out of action for the rest of the war.
Photo: Edward D. Beneš archives, Aviation archives of Northen Bohemia
HISTORY
INFO Eduard8
June 2023
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