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).
Manifold design tests for a 6 cylinder F.X. engine, aiming to improve distribution and efficiency.
| Identifier | ExFiles\Box 42\3\ Scan042 | |
| Date | 29th November 1926 | |
| Contd. -2- Hs{Lord Ernest Hives - Chair}/ACL1/T29.11.26. the indirect passage way sufficiently to impair the volumetric efficiency. After several tests we arrived at the form shewn in the accompanying sketch, and more in detail on the appended blueprint - which although there was no appreciable gain in power was found to improve the distribution relative to that given by the original manifolds. The tests were made on a 6 cyl. F.X. [Image text: 1 2 3 SECN THRO' TOP MANIFOLD. SLACED PART FILLED IN WITH HARD WOOD SIDE MANIFOLD.] As no balancing pipe was employed between the two manifolds, and appreciable "blow-back" was manifest, consumption curves are not put forward. With improved distribution we should expect to maintain the power with a weaker mixture, consequently we are fitting up a balance pipe between the front and rear manifold so that we may make accurate comparison of the consumption with the two systems. Apart from any other advantage obtained, manifolds of this form could be made narrower, thereby giving better accessibility to the plugs of cylinders Nos. 2 and 5, which in itself is a definite advantage. In light of the results shewn by these experiments we suggest it would be advisable to have constructed some manifolds of this form on the lines of the latest scheme -Lec. 2328 | ||