Checking out the 110 screamin eagle specs is usually the first thing any Harley rider does when they're looking to move up from a standard Twin Cam 96 or 103. It was the king of the hill for a long time, serving as the heart of Harley-Davidson's Custom Vehicle Operations (CVO) lineup before the Milwaukee-Eight era took over. If you're eyeing a used CVO or thinking about dropping a crate motor into your current ride, you've got to know what you're actually getting under the air cleaner.
The 110 Screamin' Eagle (SE) isn't just a bored-out 103; it's a factory-tuned beast that was designed to give touring bikes the kind of passing power that makes highway riding feel effortless. Let's dig into the numbers and the hardware that make this motor what it is.
The Foundation: Bore and Stroke
When you look at the 110 screamin eagle specs, the displacement is the big headline. This engine sits at 110 cubic inches, which translates to roughly 1,801cc. To get there, Harley used a 4.000-inch bore and a 4.375-inch stroke.
That 4-inch bore is really the sweet spot for the Twin Cam architecture. It gives the engine enough room to breathe without making the cylinder walls dangerously thin. The stroke remains the same as the 103, which means the engine keeps that classic long-stroke Harley "thump" and low-end grunt. It doesn't need to rev to the moon to make power; it just moves a massive amount of air every time those big pistons go up and down.
Horsepower and Torque Reality
There's a lot of talk on forums about what these bikes actually put down. If you look at the official 110 screamin eagle specs from the factory, they usually focus on the torque. In its stock CVO configuration, the 110 typically produces about 115 lb-ft of peak torque at the crank, usually hitting that peak around 3,750 RPM.
In the real world, once you put it on a dyno and measure power at the rear wheel, you're looking at somewhere between 85 and 95 horsepower and about 100 to 110 lb-ft of torque. Now, those numbers might sound modest compared to a modern sportbike, but in a 900-pound bagger, it's the torque that matters. It's the difference between having to downshift to pass a semi-truck and just rolling the throttle on in sixth gear and feeling the bike surge forward.
The Top End: Heads and Compression
A big part of the 110's personality comes from the Screamin' Eagle high-flow cylinder heads. These aren't your standard run-of-the-mill heads. They feature larger valves and improved porting right from the factory. They were designed specifically to feed those 4-inch pistons.
The compression ratio in the 110 screamin eagle specs is generally around 9.2:1 to 9.3:1. It's high enough to be snappy and responsive, but low enough that you don't necessarily have to hunt for race gas. It runs fine on 91 or 93 octane pump gas. However, because of that displacement and the way these heads are cast, they do tend to hold a lot of heat—which is something almost every 110 owner learns about pretty quickly.
The Camshaft: The SE-255
If you peek into the cam chest of a stock 110, you're almost certainly going to find the SE-255 cams. These are "torque cams" through and through. They are designed to dump all that power into the low and mid-range of the RPM band.
For a heavy touring bike, the SE-255 is actually a pretty smart choice by Harley. It makes the bike feel very "jumpy" and powerful right off the line. The downside? These cams tend to sign off early. Once you get past 4,500 RPM, the power starts to taper off. They also contribute to the engine running a bit hot because of the valve timing and the amount of lift they provide.
Heat Management and ACRs
One of the more technical bits in the 110 screamin eagle specs is the inclusion of Automatic Compression Releases (ACRs). Because those 110-inch cylinders create a lot of pressure, trying to start the bike when it's hot can be a nightmare for a standard starter motor. The ACRs are built into the heads and open up momentarily when you hit the starter button to bleed off some of that pressure, making the bike fire up smoothly.
Now, let's talk about the elephant in the room: heat. The 110 is known for being a "hot" motor. Between the lean factory tuning (to meet emissions) and the sheer mass of the engine, it can get toasty in stop-and-go traffic. Many riders end up swapping the factory exhaust for a "true dual" setup or a 2-into-1 and getting a proper tune to help bring those temperatures down.
Common Issues and Reliability
No look at the 110 screamin eagle specs is complete without talking about what happens after a few thousand miles. While it's a powerhouse, the early versions of the 110 had a few "growing pains."
The most famous one is probably the lifters. The stock lifters in the 110 have been known to fail, and when they do, they can take the whole engine with them. Most guys who know their way around a Twin Cam will swap the factory lifters for something like an S&S Precision lifter as a "preventative maintenance" item.
There's also the issue of the inner cam bearings and the compensator. Because the 110 makes so much more torque than the 88 or 96, it puts a lot of stress on the drivetrain. If you're buying a used bike with 20,000 miles on a 110, it's always worth asking if the compensator has been upgraded to the newer Screamin' Eagle version.
Comparing the 110 to the 103
A lot of people ask if the jump from a 103 High Output to the 110 is really worth it. On paper, the 110 screamin eagle specs show a nice bump in torque, but it's the way it delivers power that's different. The 110 feels more effortless.
Where a 103 might feel like it's working hard to maintain 80 mph against a headwind on the interstate, the 110 just glides. It has a certain "presence" on the road that the smaller Twin Cams lack. That said, a well-tuned 103 with a good set of aftermarket cams can often keep up with a stock 110. But if you start with the 110 as your baseline and add a few performance parts, you're in a different league entirely.
The Legacy of the SE 110
Even though the Milwaukee-Eight is the current king, there's still a huge following for the 110. It represents the pinnacle of the "air-cooled" (well, mostly air-cooled) Twin Cam era. It has that mechanical soul and vibration that some people feel is missing from the newer, counter-balanced engines.
When you look at the 110 screamin eagle specs, you're looking at the end of an era. It was Harley's way of seeing how far they could push the Twin Cam design before they had to move to a four-valve head. It's a raw, powerful, and slightly temperamental engine that rewards the rider who takes care of it.
Final Thoughts
If you're looking for a bike that has that "it" factor, a CVO with the 110 is hard to beat. Just keep in mind that these specs are just the starting point. Most owners end up doing a "Stage 1" (pipes, air cleaner, and tune) which really wakes the motor up and lets it breathe.
Whether you're cruising through the mountains or just riding to the local bike night, the 110 Screamin' Eagle has plenty of character. It might run a little hot, and it might need a little more attention than a standard motor, but once you twist that throttle and feel the 110 inches of American iron pull you down the road, you'll probably decide the trade-off is more than worth it.