Ford Authority

2021 Ford Mustang Mach-E Rear Motor Too Complex For Munro: Video

Former Ford engineer, owner of engineering consulting firm Munro & Associates, Inc., and YouTuber Sandy Munro has been working on disassembling and examining a 2021 Ford Mustang Mach-E for weeks now. So far, that process has included checking out the Mach-E’s undercarriagefrunk areadoor assemblyrear cargo areapillarsfront endseatsbattery packsuspensionthermal system (including a deep dive into its heating and cooling), battery trayvoltage system, instrument panel, and bare body, as well as comparing its engineering to its rivals and conducting a thorough battery analysis. Now, Munro’s latest video takes a much closer look at the Mach-E rear motor.

Right off the bat, Munro admits that he’s not terribly crazy about the complexity of the Mach-E rear motor when compared to the ones present in the Tesla Model Y and Volkswagen ID.4, mainly because it features more moving parts and it’s less refined. It isn’t all bad, however, as Munro praises the motor’s magnets, though he also points out they’re heavily glued into place rather than held by some sort of fastener.

Munro also points out that there are a total of 507 laminates in the Mach-E’s rear motor, which is a lot of tiny moving parts, in addition to other parts like the magnets. The motor is still simpler and easier to assemble than an ICE engine, Munro notes, but it’s still more complex than it needs to be. There’s also some wasted space inside the motor itself, though the unit does feature bolts with full dog points, which means that they won’t cross-thread.

There are some other perplexing things about the motor, including the fact that the power leads for the inverter aren’t straight, which would make them more efficient. The cooling system is a bit larger and more complex than the Tesla’s, the filters are difficult to access and replace, and there’s a parking pawl, which neither the VW or the Tesla has. All of these things add weight, complexity, and cost to the vehicle, which are obviously bad things, but at the same time, the Mach-E’s motors essentially function the same as its competitors.

We’ll have more interesting videos like this to share soon, so be sure and subscribe to Ford Authority for more Mustang Mach-E news and around-the-clock Ford news coverage.

Brett's lost track of all the Fords he's owned over the years and how much he's spent modifying them, but his current money pits include an S550 Mustang and 13th gen F-150.

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  1. Justin L.

    I thought the drive units were designed by Borg Warner? Doesn’t mean they can’t be improved in the future of course, but I didn’t see that mentioned in the video anywhere.

    1. Ford Owner

      Munro probably doesn’t read Ford Authority and didn’t see the article describing the Borg Wagner drive units. I bet Ford engineers will redesign the drive units for the next Mach-E generation as they did for the Fusion and C-Max hybrids, which used Aisin electric tranaxles in the first generations , and later generations use Ford HD-45 units.

  2. DennisC

    Love the Sandy Munro videos. Sometimes he makes me want to sell my Ford stock though, like the inefficiencies in the Mach e inverter. I used to have a program that paid my employees a special bonus any time they made a recommendation that saved the company money, assuming we were able to implement it in our systems and operations. I can’t imagine that a massive, complex company like Ford doesn’t have such a program. The suggestions team Munro made on the motor and inverter are so simple and basic, I am left thinking the engineering designs were done by someone who never designed anything before.

  3. Mr Awesome

    This guy is way too old. He knows nothing about modern technology.

    1. Montana Man

      “Mr Awesome”.


    2. SaucyMonk

      Found the Ford engineer

  4. Eric C Post

    Sandy frustrates me. He’s not an expert in everything and he often says “I can understand” or “I don’t know why” or “I can’t figure it out” followed by “its unnecessary”.

    Why not bring in an electric motor engineer and have them provide context off opinion.

    Sandy is also a big fan of integrated parts… IE the battery cooling system connection for the Tesla. It’s an inexpensive way to do it .. But when you break the nipple Tesla can’t just replace a $5 part…they have to replace the entire battery for $16,000.

    1. Scoutdude

      Good old Sandy “If I don’t understand it, it is stupid” Munro.

    2. BEVerly

      100% this. The guy is clueless.

  5. NTN

    Wrap it like You want, it’s still as it is. Maybe Munro is not as modern as You guys, but You don’t need to be an expert to compare a good design and a not good one. Integrated design is hard to fix, but engineers should focus on things that are hard to break, not easy to fix. Where have we arrived from the first Ford? Nowadays the cars are crazy complex. And they break all the time (yea yea mine never broke bla bla bla). A car that has parts with planned lifetime can be improved. And when Munro says that a hose can be shorter, even old Henry Ford can see that… Let’s see if Ford will make the Mach-e better. It can be done. Question is if Ford is flexible, or made of old pennies-counting guys.

  6. BEVerly

    There are things that can actually be learned from a tear down of the motor: stack length, diameter, air gap, torque density, concentrated or distributed winding, copper fill factor, rotor skew etc.

    These are metrics that could actually be used to compare competition.

    Unfortunately, Sandy doesn’t understand any of this but still pretends to be an expert.

  7. MARK

    Still, not nearly as complicated as the turbo encabulator.

  8. DC Uplink

    As a new owner of a Mach E around 1k miles use mow, he’s been tearing down a machine that works.

    Ford did a great job of taking majority of the lessons from the cmax energi line and made something fun and intuitive while also incorporating COTS products to get the job done somewhat cheaply.

    Are there some drawbacks? Sure, it doesn’t quite fit a giant person, but most cars don’t.

    Is the frunk temperature controlled? No, but could be in newer versions.

    Is the frunk smaller than competitors? Sure, probably because the design was rushed to market and drive hype for the lightning and layer models if it was successful. I’m guessing now that it is that’s why ford went all in.

    Just saying the hate for the brand being applied is also not understood if folks gave it a test drive.

    It’s a great first full electric for Ford.

    Honestly if hose clamps are my biggest concern in three years, fantastic.

    I’d much rather deal with hose clamps than a blown blown engine, oil changes, gasket replacements, timing issues, etc.

  9. Reyes

    Anytime you design something new there’s always the armchair quarterbacks telling you how it should be done it takes time and it also takes somebody who is bold enough to try something new necessity is the mother of invention

  10. Wade Martin

    Stop with Hello Boys and Girls


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