Allison and Merlin Engine Details

awesome. Let me let me go get So, this is one of the Allison's. A quick way to tell between Allison and the Rolls-Royce is the Allison's got this real funky looking intake manifold. Almost kind of looks like a modern diesel truck manifold or something up there. And this is Dan Hy. He is the biggest authority we have in long time. You are my friend. And he is been a a crewman and a crew chief on the unlimited since the early 80s. So he he knows these engines very very well. I know Merlin better than I know Griffins and Allison, but I'll answer what I can. So what are the technical specifications of a Merlin? Of a Merlin? Uh 1,650 cubic in. Um I believe in the airplane it turns somewhere in the neighborhood of 2800 RPM, but in a race boat we would try and turn them over 4,000 RPM. In the uh airplane, I believe they pulled somewhere in the neighborhood of 80 in of manifold pressure. Racing trim, we tried to pull 120 plus in. So that's about uh 45 lbs of boost. That's pretty stack. Yeah, it is. And in race trim with nitrous oxide, which all the race boats ran, um we estimated that you've made around 3,000 horsepower with them. And that's all happening with like the original 1940s pistons. Well, it is, but um speaking to the Rolls Merlin, pretty much every part in a Rolls Merlin that was being used for racing had to be modified. The case, the banks, the valves, the valve springs, the cams, the blowers. I mean, every part, the wheelhouse, the blower, which is a blower drive, everything was modified. I mean, you can make plenty of horsepower just make it live. So, interesting. Allisons are are a little different. Um,