Piston Slap: The Final Carbon Fiber Nail?

Sajeev Mehta
by Sajeev Mehta

TTAC Commentator gimmeamanual writes:

Hi Sajeev,

The recent article about the carbon fiber subframe by Magna and the comments predicting vehicle life-ending failures got me to thinking — in the last 10 years or so, has any automaker introduced an innovation or major shift from the norm that resulted in repair costs so expensive that the vehicle would be better off scrapped inside what one would consider its prime service life (say, 10yrs/100k)?

It seems we’re often too ready to predict gloom (turbos exploding, unrepairable aluminum trucks) and not give the engineering teams the credit they deserve. Yeah, some technologies do suck in execution, like the Focus DCT, but they don’t result in scrapyards filling up with otherwise pristine examples.

Sajeev answers:

I doubt such an innovation exists, the “drive vs. scrap” decision is often a death by a thousand cuts, not a single item. And it’s not necessarily about the engineering; more about modern automotive recycling operations.

But it depends on the vehicle’s design, parts availability and unique living conditions after driving off the showroom floor. A fully-depreciated Audi A8 with a trashed interior and electrical faults will likely donate itself to your next cooler fulla beer/soda cans. But damn near any 7.3-liter Power Stroke Ford with a blown motor? Someone will fix (and flip!) quickly with recycled parts.

To wit, carbon fiber subframes on a mass-market vehicle will also utilize the automotive recycling industry to ensure a good stock of perfect parts from flooded/rear ended/otherwise trashed examples. Sure, it’ll be more to replace than pulling out the kinks in a Camry’s metal subframe, but the threshold for being a complete write off might be higher than the naysayers suggest.

Most subframes are bolt-in, and I certainly don’t see Ford trying to weld carbon fiber to a metal unibody. So if Ford pulls the trigger on their upcoming 2020-ish sedan, don’t wreck one in the first two-ish years without comprehensive insurance. But in the year 2025? Expect junkyards well-stocked with used CF subframes, ready for shipment to your nearest body shop for bolt-in perfection.

I don’t see the doom and gloom equation. I see our automotive recycling ecosystem ready to take on this technological wonder on a large scale implementation. Off to you, Best and Brightest!

[Image: Magna]

Send your queries to sajeev@thetruthaboutcars.com. Spare no details and ask for a speedy resolution if you’re in a hurry…but be realistic, and use your make/model specific forums instead of TTAC for more timely advice.

Sajeev Mehta
Sajeev Mehta

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  • Slap Slap on Apr 27, 2018

    The problem using a salvage carbon fiber subframe is that it can be damaged yet look fine to an observer.

  • Goatshadow Goatshadow on Apr 27, 2018

    What are repairs on 8-9-10-speed transmissions like?

    • Jack Denver Jack Denver on Apr 27, 2018

      Automatic transmissions were always complex devices. Adding a couple of more planetary gear sets makes them slightly more complex (and expensive) but not by a lot. What is more important is that the transmission is a solid design and sized properly for the application. You can have a 4 speed auto that is totally unreliable or an 8 speed that is rock solid.

  • FreedMike Not much to look at, but these were sweet to drive.
  • EBFlex Ford finally making a good decision although they should shut down their EV operations and investment all together. Why lose that money too?
  • Mike Lol. This is the king of suvs. And its made by GM.Why is everyone trashing it?Top of its its class for a quarter century.
  • Frank Drove past there last week, plant has a huge poster of a bronco on the outside. I was thinking "Is that where they build the new broncos?" I know they use to make the Edge and that other mundane SUV there but I believe both have been canned.
  • CanadaCraig Toyota saw this coming. So good for them for being courageous enough to say, "Wait a minute. Let's not rush into anything."
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