ACCESS: Top Secret
- Jul 25, 2007
- Reaction score
I've read that the F-82's adoption of the Allison engine was driven by the unavailability of US-built Merlins ...
How did the Allison engine in the P-51H compare with earlier Allisons?
How did horsepower compare with Merlins?
I am especially curious about manifold boost pressures and performance at higher altitudes.
The P-51H wasn't powered by an Allison. The 'H had aa Packard V-1650-9 Merlin - 1,380 hp (rated), 2,280 hp (max, with 50:50 water/methanol injection) at 3,000 rpm. Manifold boost pressure was 66 inches.
The XP-51J and XP-82A had Allison V-1710-119 ('F32 and 'F32R/'F32L) engines - the first two-stage Allisons with an aftercooler. Postwar production P-82E/'Fs had Allison V-1710-143/145 ('G6R/'G6L) with a max rating of 2,250 hp at 3,200 rpm. That rating was at sea level using 115/145 octane fuel with Anti-Detonation Injection (ADI). Manifold pressure was 100 inches in high gear.