(a) The dynamometer shall have a power absorption unit for simulation of road load power and flywheels or other means of simulating the inertia weight as specified in § 86.129.
(1) The dynamometer shall have a roll or shaft revolution counter for determination of distance driven.
(2) In lieu of the requirement in (b) (1) of this section the manufacturer shall provide some means, approved in advance by the Administrator, for the determination of distance driven.
(c) Small twin-roll dynamometers shall have a nominal roll diameter of 8.65 inches and a nominal roll spacing of 17 inches. Large single-roll dynamometers shall have a nominal roll diameter of 48 inches. Dynamometers with other roll specifications may be used if the total simulated road load power can be shown to be equivalent, and if approved in advance by the Administrator.
[42 FR 45651, Sept. 12, 1977]
Title 40 published on 2014-07-01
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