3 Steam Engines That Joe Pie Highly Recommends | Stirlingkit

If you follow Austin machinist and YouTube creator Joe Pie, you've watched him spend months testing our full RETROL steam engine lineup, one model at a time, on his workbench.

He fully unboxed, built, and test-fired three core models: the SE-01 Beam Engine, the SE-02 Horizontal Mill Engine, and the flagship SE-03 Boiler Kit.

The biggest surprise from his series? He hooked the SE-03 flywheel up to our GF-01 Mini Workshop, powering a fully functional tiny drill press, grinder, and streetlamp with just one steam engine.

We've compiled every build note, camera-side assembly hack, and Joe's unfiltered honest thoughts below — so you can skip the trial and error and pick the perfect steam kit for your own bench.

Joe Pie's Full Bench Test of All Three RETROL Steam Models

Joe didn't just build these back to back for a single video. Each kit got its own full teardown, its own assembly notes, and its own honest verdict on his channel. That's three separate real-world stress tests of the RETROL lineup, from a guy who machines parts for a living and doesn't sugarcoat a bad tolerance when he finds one.

Here's the quick version before we get into each model: all three kits shipped well packed, all three held tight tolerances after powder coat, and all three earned a spot on Joe's shelf. The differences come down to build complexity, mechanism type, and how far you want to take the display.

Joe's Verdict: "These kits go together absolutely flawlessly." That's a direct quote from his SE-03 companion build, and it sets the tone for the whole series.

If you're new to his channel, Joe Pie builds and reviews model engines from his shop in Austin, Texas, and he's known for pulling models apart to check welds, thread quality, and tolerance stack-up before he'll say a good word about any kit on camera. That's why his RETROL series carries weight with the tinkerer crowd: nothing here is sponsored fluff, it's a working machinist's honest bench notes.

SE-01 Beam Engine – Joe's Assembly Tips & Who It's Best For

The SE-01 is where Joe's RETROL run started, and it's the classic entry point into the lineup: a beam-engine layout, 85 pieces, and a flyball governor that turns into the visual centerpiece of the whole build once it's spinning.

Joe's Key Build Notes for SE-01

• The build manual is a fully pictorial, step-by-step guide, so it's followable even if English isn't your first language
• The governor post is aluminum. Go easy on the grub screw, or you'll dimple the post and fight future adjustments
• Wiring is fully color-coded: red to red, black to black, straight through, no guesswork
• The kit ships with its own lamp post and generator, so the model lights up as it runs

Joe's Pro Tip: loosen the base screws first if you ever need to re-angle the governor post. Don't force it sideways while it's still torqued down.

And here's the detail machinists love: the flyball governor's spinning weights are the actual mechanical origin of the phrase "balls out" — a fun mechanical origin story every machinist appreciates once they see the governor in motion for the first time.

Why Joe Recommends SE-01 for New Builders

Joe's Pick For: first-time builders, casual weekend hobbyists, and anyone who wants a clean run without steam or fuel involved. It's also a genuinely stunning piece of office desk decor once it's done — Joe's exact words were that it "would be a great little addition to your desk or your shelf" even before you add anything else to it.

Grab Your RETROL SE-01 Kit
Shop RETROL SE-01 Beam Steam Engine
Use Joe's exclusive discount code found in his YouTube review videos to save extra.

SE-02 Horizontal Mill Engine – Air Run Function & Reverse Mechanism Guide

Same box, completely different animal. Joe's next build swapped the beam layout for a compact horizontal single-cylinder design — 39 unique parts, 19 assembly steps, plus its own generator and streetlamp combo. This is the kit that made Joe slow down and actually think through a mechanism instead of just following steps.

Common Assembly Bind Fix From Joe's Video

• The flywheel can catch as it rotates through a full turn on first assembly — this is normal, not a defect
• Loosen the four screws on the standoff block if it binds, then shift the block outboard to relieve tension
• Fit and finish held up under close inspection: clean welds, even coating, tight tolerances throughout
• The reverse mechanism runs cleanly once the bind is cleared — no persistent drag

Joe's Pro Tip: a bind on first assembly usually means a tolerance stack-up, not a broken part. Chase the standoff block before you assume anything is wrong.

The SE-02 also runs great on compressed air alone, which means you get a full clean air-powered display with zero steam fuel involved if that's the direction you want to take it.

Ideal Builders for the SE-02 Kit

Joe's Pick For: tinkerers who genuinely enjoy mechanical puzzles, builders who want more challenge than the SE-01 offers, and anyone who wants to watch a reverse mechanism actually do its job instead of just spinning one direction.

Grab Your RETROL SE-02 Kit
Shop RETROL SE-02 Horizontal Mill Steam Engine
Use Joe's exclusive discount code found in his YouTube review videos to save extra.

Flagship SE-03 Boiler Engine – Pro Tricks + GF-01 Mini Workshop Pairing

This is the build Joe says convinced him to review two kits together instead of stopping at one. The SE-03's boiler is noticeably heavier in hand, the weld and coating finish held up corner by corner, and the manual keeps every step to a minimal part count so nothing feels overwhelming, even with a full boiler and generator system involved.

Critical Assembly Steps Joe Warns About

• One eccentric has to go on before the flywheel — the manual doesn't call this out explicitly, so do it early or you'll be backtracking
• Every boiler fitting (sight glass, pressure gauge, whistle, fill valve) uses its own individual O-ring — take your time so none get knocked out of place
• All wiring stays fully color-coded, so the electrical side is genuinely the easiest part of this build
• Threaded inserts took every screw cleanly through the coating with zero cross-threading on Joe's unit

Joe's Verdict: "These kits go together absolutely flawlessly" — and this is the model where that comment carries the most weight, given how much more is going on mechanically compared to SE-01 or SE-02.

The Game-Changing SE-03 & GF-01 Combo Demo

Here's the twist nobody saw coming, including Joe. Digging through the "frequently purchased together" suggestions on the product page, he picked up the GF-01 Mini Workshop: a drill press, a pedestal grinder, and a corner streetlamp sharing one base, with its own three-wheel pulley built in.

That third pulley isn't decorative. It's engineered to line up with the extra pulley position on the SE-03's flywheel. Connect the two with the included drive belts, and the SE-03 becomes the power plant for an entire miniature machine shop — drill press spinning, grinder turning, streetlamp lit, all off one steam engine.

"I just thought the fact that they had planned far enough ahead to put a three-wheel pulley on the other side of the flywheel — that was just too cool to pass up." — Joe Pie

Joe's tip if you're building this combo purely for static display: leave the drive belts off during assembly, then tape them to the underside of the base. That way you can add the drivetrain later without ever disassembling the finished models.

Joe's Pick For: serious steam model collectors, builders ready to step up to a full boiler-and-generator system, and anyone shopping for a gift for machinists or engineering-minded builders in their life — this is the premium shelf centerpiece of the whole lineup.

Joe's Buyer Guide: How To Pick Your First RETROL Steam Engine

Joe's three builds map out a natural upgrade path if you're building out a full RETROL collection over time: SE-01 for your entry build, SE-02 once you want more mechanical puzzle-solving, then SE-03 as your flagship collector piece — with the GF-01 workshop as the expansion move once you're hooked.

Three scenarios worth calling out from Joe's comments section, since they come up constantly:

• Beginner weekend build: start with the SE-01. It's forgiving, fully pictorial, and doesn't require any steam experience
• Desk display collection: any of the three work solo, but the SE-02's air-run function means zero cleanup between display sessions
• Father-son hobby project: the SE-03 + GF-01 combo gives you a multi-session build with a genuinely impressive payoff at the end

For the full lineup beyond these three models, check out The Complete RETROL Steam Engine Collection Guide.

Frequently Asked Questions From Joe Pie's YouTube Comments

Do I need steam engine experience to build the SE-01?

No. Joe specifically recommends the SE-01 as a starting point for new builders. The manual is a fully pictorial, step-by-step build guide, and the wiring is entirely color-coded.

Why did my SE-02 flywheel bind during the first assembly?

This is a common tolerance stack-up, not a defect. Loosen the four screws on the standoff block and shift it outboard to relieve tension, then re-tighten.

Can the SE-03 actually power the GF-01 workshop kit?

Yes. The GF-01's three-wheel pulley is designed to connect directly to an extra pulley position on the SE-03's flywheel using the included drive belts, letting one engine drive the drill press, grinder, and streetlamp simultaneously.

Do I have to run these engines on steam?

No. All three models can be run on compressed air for a clean, fuel-free display, which is exactly how Joe demoed the SE-02 and the SE-03 + GF-01 combo on camera.

Is there a discount code for RETROL kits?

Joe includes an exclusive discount code in the description of each of his RETROL review videos linked throughout this post.

How long does each build take?

Based on Joe's bench sessions, the SE-01 is the fastest weekend build. The SE-02 takes longer because of the reverse mechanism and finer tolerance work. The SE-03 plus GF-01 combo is realistically a multi-session project, which is exactly what makes it a good father-son hobby build.

All three RETROL steam engine kits are available to order on Stirlingkit.com. Don't forget to grab Joe's exclusive discount code hidden in his YouTube review descriptions to cut costs on your build.

Once you finish assembling your steam engine, tag us and Joe Pie on social media. We regularly feature fan builds alongside Joe's original bench projects on our channels.

Not sure which kit fits your hobby goals? Scroll back to Joe's Buyer Guide above to match your skill level to the right model.