These are exceptional cases, including large bore engines
                           intended for E2 applications, in which, due to their oscillating masses
                           and construction, engines cannot be run at low load at nominal speed
                           without the risk of damaging essential components. In such cases,
                           the engine manufacturer shall make application to the Administration
                           that the test cycle as given in table 1 above may be modified for
                           the 25% power mode with regard to the engine speed. The adjusted engine
                           speed at 25% power, however, shall be as close as possible to the
                           rated engine speed, as recommended by the engine manufacturer and
                           approved by the Administration. The applicable weighting factors for
                           the test cycle shall remain unchanged.