[Manfred]

Hier mal ein Auszug aus dem aktuellen NHRA-Reglement (2011)

General Regulations Section 20, page 8
1:8 LOWER ENGINE CONTAINMENT DEVICE
In classes where specified, must utilize an NHRA-accepted lower
engine oil-retention device. SFI Spec 7.1 or 7.2 Lower Engine
Containment Device permitted. A properly fitting lower engine
ballistic/restraint device mandatory. The NHRA Technical staff can
accept or reject any device. Any device that fails to perform as
required must be replaced or repaired to the satisfaction of the
Technical staff prior to any furthur runs. When used, an SFI Spec
7.1 or 7.2 Lower Engine Containment Device must cover the sides
of the block and pan up to within one inch of the head mating
surface and extend to within 1 1/2 inches of the front and rear of the
cylinder case area. SFI Spec 7.1 devices must be
updated/recertified by the original manufacturer at one-year
intervals. In classes where specified, a belly pan may be used in
lieu of a device attached to the engine. The belly pan must extend
from framerail to framerail and extend forward of the harmonic
balancer and to the rear of the engine block and must incorporate a
minimum 2-inch-high lip on all sides unless specified in Class
Requirements. Minimum number of slots or holes in the walls to
clear frame, steering, or lines permitted. A nonflammable, oilabsorbent
liner mandatory inside of retention device.

Ich habe mal im Net gesucht und einige Firmen die Öl absorbierendes Vlies oder ähnliches herstellen, auch hier in D gefunden.
Sollte also keinso großes Problem darstellen an das richtige Material zu kommen.
Gruß Manfred