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).
The performance of a Peregrine engine fitted with an 1860 cc Power-plus blower.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page203 | |
| Date | 16th July 1932 | |
| 4027a. R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c. SS.{S. Smith} Wor.{Arthur Wormald - General Works Manager} c. E.{Mr Elliott - Chief Engineer} By.{R.W. Bailey - Chief Engineer} c. Ds. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}1/MA.16.7.32. PEREGRINE. We have run Peregrine with an 1860 cc Power-plus blower. The attached curve No. Pr.19 shews the results. Peak of Power Curve. From the appearance of the curve it should peak about 5000 R.P.M. but we have only taken a snap reading at this top speed. This is good considering the small amount of overlap on the camshaft and the fact that only 7½ lbs/sq.in. of boost was used. With a racing camshaft and 15 lbs/sq.in. boost, which is often used today, the engine should peak at over 6000 R.P.M. Low Speed M.E.P. It is encouraging to note that we do get an appreciable improvement in performance as low as 1000 R.P.M. part of which is undoubtedly due to improved distribution. Slow Running. The engine would slow run at 300 R.P.M. quite reasonably though the blower was over 12" away from the front of the engine and the pipe correspondingly longer than it would be in practice. Distribution. The distribution at all speeds appeared to be improved by the blower. Back Fires. We had a number of back fires. The blow off valves, which we fitted as on the Alfa, worked satisfactorily and nothing appeared to suffer. | ||