If you're looking to wake up a sleepy Evolution engine, checking out the andrews ev27 cam specs is usually the first step for most Harley riders. It's arguably one of the most popular bolt-in cams ever made for the 80-inch Big Twin, and for good reason. It's that "Goldilocks" upgrade—not too aggressive that it ruins your rideability, but punchy enough to make you feel like you actually bought a new motorcycle.
Most of us who ride older Evos know the struggle. The stock cam was designed more to meet EPA noise and emission standards than to actually provide a thrilling ride. It's sluggish off the line and runs out of steam right when you're trying to pass a semi-truck on the highway. That's where the EV27 steps in to save the day.
What Makes the EV27 So Popular?
Before we dive deep into the technical side of the andrews ev27 cam specs, it's worth talking about why this specific piece of metal has such a cult following. The Evolution engine is a legend for its reliability, but in its stock form, it's a bit restricted. The EV27 is designed to be a "bolt-in" cam, which is music to the ears of any home mechanic.
"Bolt-in" means you don't necessarily have to go out and buy high-lift valve springs, get into complicated headwork, or worry about piston-to-valve clearance issues in a stock motor. You can basically swap it out, tune your carb, and hit the road. It's the ultimate weekend project that yields immediate, seat-of-the-pants results.
A Deep Dive into the Andrews EV27 Cam Specs
Let's look at the actual numbers because that's what really tells the story of how your bike is going to behave once you thumb the starter.
The andrews ev27 cam specs break down like this: * Lift: .495" for both intake and exhaust. * Duration: 240 degrees for both intake and exhaust. * Timing (Intake): 20°/40° (Open/Close). * Timing (Exhaust): 42°/18° (Open/Close). * TDC Lift: .160" (Intake) and .148" (Exhaust).
So, what does all that jargon actually mean when you're sitting at a red light?
The .495 lift is key. Since it stays under that .500 mark, it plays nicely with your stock Harley valve springs. If you went much higher, you'd be looking at spring bind and a much more expensive bill at the shop. The 240-degree duration is where the "bolt-in" magic happens. It's long enough to let the engine breathe significantly better than stock, but short enough that you don't lose all your low-end torque.
The Power Band and Performance
One of the most important things to note about the andrews ev27 cam specs is where the power actually lives. This cam is designed to shine in the 2000 to 5500 RPM range.
If you're a touring rider who spends all day at 2500 RPM, you're going to love the way this feels. It provides a massive boost in mid-range passing power. You know that feeling when you're cruising at 65 mph and need to get around someone, but the bike just kind of groans when you twist the throttle? The EV27 fixes that. It gives the Evo a "leggy" feel, allowing it to pull hard through the gears without hitting a wall.
Why the Intake Closing Point Matters
If you look closely at the andrews ev27 cam specs, the intake closing point is at 40 degrees. This is a crucial number for Evo owners. A cam that closes the intake valve too late will kill your low-end compression, making the bike feel sluggish off the line. By closing at 40 degrees, the EV27 keeps enough cylinder pressure to keep the bike snappy at low speeds while still allowing for that high-end flow. It's a very balanced approach that works well for both light Softails and heavier Dressers.
Real-World Rideability and Sound
Let's be honest, we don't just change cams for the horsepower; we do it for the soul of the machine. When you install a cam with these specs, the idle changes just enough to let people know there's something "extra" under the tank. It's not a radical, loopy drag-race idle that makes the bike hard to handle in traffic, but it definitely sounds more purposeful than the stock "sewing machine" hum.
The throttle response is where you'll notice the biggest difference. Because the andrews ev27 cam specs are optimized for the mid-range, the bike feels much more responsive. It loses that "heavy" feeling when you're trying to accelerate out of a corner. It just wants to go.
Installation Tips for the EV27
Even though it's a bolt-in cam, you can't just throw it in and hope for the best. There are a few things you should keep in mind to make sure you get the most out of the andrews ev27 cam specs.
Do You Need Adjustable Pushrods?
Technically, you can use stock pushrods if you're careful, but almost everyone will tell you to go with adjustables. Why? Because it makes the job ten times easier. If you use the stock one-piece pushrods, you have to take the top end of the rockers apart. With adjustables, you can just cut the old ones out and save yourself hours of labor. Plus, it allows you to dial in the lifter preload perfectly, which keeps the valvetrain quiet.
Checking the Cam Gear
One thing that often gets overlooked when people talk about andrews ev27 cam specs is the gear fitment. Every Evo motor is a little different, and Harley used color-coded gears to account for tolerances. When you buy an EV27, it usually comes with a gear pressed on, but you need to check the "whine." If the gear is too tight, it'll sound like a supercharger (and not in a good way). If it's too loose, it'll clatter. Most riders prefer to have their original stock gear pressed onto the new Andrews cam to ensure a perfect, quiet fit.
Don't Forget the Bearing
While you have the cam chest open, for the love of all things holy, replace the inner cam bearing. The stock INA bearings were notorious for failing and dumping needle bearings into the engine. Replace it with a full-complement Torrington-style bearing (usually a B-138). It's a cheap part that provides massive peace of mind.
Comparing the EV27 to Other Andrews Cams
It's easy to get lost in the catalog, so how does the EV27 stack up against its siblings?
- EV13: This is the "tractor" cam. It's designed for heavy touring bikes and people who never rev past 4000 RPM. It has more bottom-end grunt than the EV27 but dies off much sooner.
- EV46: This is the "hot rod" cam. It has more lift and duration than the EV27. It sounds cooler and pulls harder at the top end, but you'll lose some of that "stoplight-to-stoplight" grunt that makes the EV27 so usable in daily traffic.
For most guys riding a standard Evo, the andrews ev27 cam specs offer the best middle ground. It's the "daily driver" performance cam.
Final Thoughts on the EV27
At the end of the day, upgrading your cam is the single best bang-for-your-buck modification you can do to an Evolution engine. The andrews ev27 cam specs are tried and true. It's a design that has been around for decades because it just works. It transforms the bike from a polite cruiser into a machine that actually wants to play.
If you're tired of your 80-inch motor feeling a little winded on the hills or you're just looking for that extra bit of "oomph" when you twist the grip, you really can't go wrong here. Just make sure you pair it with a good high-flow air cleaner and a decent set of pipes. A cam can only do so much if the engine can't get air in or exhaust out. Tune your CV carb (maybe a 45 slow jet and a shim on the needle), and you'll have a bike that feels brand new again.