From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Preliminary report on the bench testing of a B.R. Distributor incorporating a Lucas Governor D.514.
| Identifier | ExFiles\Box 168\3\ img157 | |
| Date | 20th April 1939 | |
| To By.{R.W. Bailey - Chief Engineer} c. to By/RD. c. to La.{L. A. Archer} 6119. HM{Capt. W. Hallam - Head Repairs}/KC.9/JH.20.4.39. B.R. Distributor to RCD.838. Incorporating Lucas Governor D.514. (Preliminary Report). Governor. (D.514). We have now bench tested the first two distributors of the above type. In each case we found that the cams were too tight on the governor shaft due to (1 The head of the cam retaining screw rubbing on the bore of the cam (2, the presence of gritty substance in the grease. These were as supplied by Messrs. Lucas. The parts were then washed out and corrected by d/Metcalfe before testing. The drawing for this unit shows a plain washer under the head of the retaining screw, this is not included in the units supplied for test. This type of governor is late getting off the mark, and even without any weight retaining spring, the lowest speed at which advance commences is 260 r.p.m. It is important that the governor starts to advance not later than 170 distributor r.p.m. on the B.60 and B.80, and not later than 190 r.p.m. on the B.V. and Wraith units, also the characteristic should lie within 1° limits (distributor). We Delco-Remy work to these limits. Attached are curves and governor spring data for obtaining the required characteristic for B.V. and Wraith units. It will be noticed that the governor units to D.514 require very little spring adjustment for obtaining the Wraith curve, but require new springs for the B.V. characteristic. The full range on the B.V. governor is 16°, however, the much stronger tension required on one of the springs restricts this advance to 14° at the maximum speed. The B.60 and B.80 units require a full advance of 16° ± 1° and 15° ± 1° respectively, whereas the B.V. and Wraith require 13.5° ± 1° and 14° ± 1° respectively. | ||