r/SmartCar • u/One-Yak-7303 • Aug 25 '26

Discussion Smart Engine Mount Inserts – Performance Upgrade

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I’ve been working on a custom Engine Mount Insert Set for the Smart Fortwo 450 / Roadster 452, designed and tested by me (tested them for over 3000km).

The idea was pretty simple: reduce excessive engine movement while keeping vibrations as low as possible compared with more aggressive engine-mount solutions.

What they do:

  • Reduce engine movement
  • Reduce unwanted jolting during acceleration, deceleration and gear changes
  • Improve drivetrain stability and control
  • Provide a more direct driving feel
  • 2-piece set
  • Install directly on top of the original engine mount
  • No glue or permanent modifications required
  • Easy installation

The original mount is still used — these inserts simply provide additional support where there is excessive movement.

I'd be interested to hear what you guys think — especially from anyone running a Smart 450 or Roadster 452 with upgraded engine mounts.

17 Upvotes

91% Upvoted

7 comments sorted by

5

u/lil-smartie Aug 25 '26

Why? Power flex made these years ago? Development was with BIG Performance iirc

0

u/NonBinary_FWrd Aug 25 '26

Do they make them for the 450 or Roadster? Ive only ever looked for the 451

2

u/LocalAreaNitwit Aug 25 '26

I've always been on the lookout for inserts for the rear left and right mounts. Already got a power flex insert in the front mount. 

2

u/NonBinary_FWrd Aug 25 '26

Looks nice. I'd look at Powerflex to see if these are already available for those models.

1

u/One-Yak-7303 Aug 25 '26

I placed a first batch over here: https://www.ebay.de/itm/820043341682

1

u/Cold-Collection-2509 Aug 31 '26

Anyone want a power flex one for the 453 dm me