#engineering

Joe writes:

Can you explain black plastic on cars? I saw an Audi Q7 with black plastic all over the bottom, but then a Q5 doesn’t have it. Sometimes the plastic isn’t black but color coded like an Eddie Bauer Ford or something else.

As the owner of a 2013 Tesla Model S P85 and occasional TTAC writer, I have my opinions on the Model 3. Many commenters thought Tesla’s business model of starting at the high-end and working its way down market was crazy, but Elon Musk had the right idea: use the cash flow from high-end car manufacturing to ramp up your engineering chops and supplier relationships so you can push prices down to eventually make a mainstream product.

That’s exactly what Tesla is doing and the plan seems to be working brilliantly — but there’s a catch: managing the engineering “complexity budget.”

Reader Brian Tai writes:

I’ve been an enthusiast and part-time DIYer for years now. I love to learn about everything automotive.

My question for you: why are cars with small engines always inline-fours? Why do manufacturers not put 2.0-liter V6s into cars? I know they don’t usually use big displacement inline-fours because of NVH issues, but what about the other way around?

Thank you for your question, Brian. I’ve been wondering about this very aspect of engineering for a while and you just gave me enough push to go sniffing for answers.

BT writes:

Why aren’t we seeing diesel/electric hybrid cars and light duty trucks? Wouldn’t the fuel economy be phenomenal? Gas hybrids do well in their own right, as do diesels. So what’s holding up the diesel/electric Passat? Many cities have gone to diesel/electric buses for fuel savings, so we know the technology is real for passenger vehicles. Is the combined torque simply too much for mere mortals to use responsibly?

What gives, Sajeev?

Scott writes:

Hi Sajeev!

I have a 2015 Civic, but my question applies to lots of cars.

I live in Maine, which has lots of nice weather for driving around with the windows down. The buffeting, or “helicopter effect”, with the windows down is driving me batty! Also the “white noise” of the rushing wind is quite loud when the windows are open. I can adjust the windows to limit both issues somewhat, but is there anything else I can do?

Chances are if you have an Internet connection and even a passing interest in automobiles, you’ve heard about the “Jalopnik Camaro crash.” If not, here’s a quick catch-up: Patrick George, who covers a variety of topics for Gawker’s cars-and-planes-and-wow-just-wow blog, managed to understeer his way out of a lead-follow pace lap at Detroit’s Belle Isle Grand Prix course and into a wall. Damage to the car was relatively minor. He was then removed from the event by GM security, in marked contrast to the kid-glove treatment given About.com writer and part-time The Onion-wannabe Aaron Gold after Mr. Gold managed to put a Camaro ZL1 in the tire wall at VIR for no reason whatsoever.

The veritable blizzard of publicity for both Jalopnik and GM in the week that followed has caused some of the more jaded observers of the autojourno game to wonder if perhaps the whole thing isn’t a masterstroke of guerilla marketing. I have to admit I had my own doubts as to the authenticity of the incident, doubts that have not been completely erased by discussions with Patrick and other members of the Jalop staff.

After watching the video a few times, however, I’ve come to believe that it’s probably genuine. I’ve also come to believe that many of Patrick’s harshest critics on YouTube and elsewhere might have found themselves “in the wall” given the same set of circumstances. So if you want to know what Patrick did wrong, why the incident unfolded as it did, and how it relates to an off-track incident I witnessed myself the day before Patrick’s crash, then click the jump and I’ll explain it all!

Suppliers are integral to new technology in the auto industry to an extent not true since the early years of the 20th century, when ventures such as Ford began as mere assemblers, not manufacturers. That will be highlighted on Monday at the 21st PACE “academy awards” for supplier innovation. (For those not in the know, Monday’s the opening night of the SAE [Society of Automotive Engineers] in Detroit.)

Aside from the great friendships forced via encouraged bribing that naturally occur when like-minded people congregate, the 24 Hours of LeMons is a fantastic opportunity for those wearing a Judge’s robe. Take last month’s race at Eagles Canyon Raceway: when stupid (yet purposeful) things like this Flavor Flav clock on the dash of this Mitsubishi Eclipse arrive, I can’t help feeling like I’m hosting “ Pimp My Ride LeMons” edition…

While Xzibit makes hilarious faces/comments as the kids talk about their hooptie’s general crappiness, I just snap a photo and begin judging them…so click the link to see more hilarity.

Is the next Jeep Wrangler getting a diesel? What about an air suspension? It’s looking that way, at least according to Automotive News.

The problem with driving at night in the raining or snowing conditions is that your headlights work too well. They light up the rain and snow as much as they illuminate the road ahead, sometimes more so. In a novel approach using cameras, computers and DLP projectors to replace conventional headlight bulbs, researchers at Carnegie Mellon University have developed a “smart” headlight system that essentially shines light between the rain drops.

“Ask an Engineer” is hosted by Andrew Bell, a mechanical engineer and car enthusiast. Andrew has his MASc in Mechanical Engineering from the University of Toronto, and has worked on Formula SAE teams, as well as alternative fuel technologies in Denmark and Canada. Andrew’s column will explore engineering topics in the most accessible manner possible.

C.V. writes:

I am a mechanical engineering student looking to learn how to work on cars.

My friend has given me the opportunity to take his 1988 Mazda B2200 extra-cab 5-speed. When I drove it, I saw why. The catalytic converter has broken off, and apparently pieces of it are in the exhaust. Would it be possible to just replace the catalytic converter, or should I replace the whole exhaust?

Need an engineering project? Got 1,200 hours to kill with nothing to do? Take a tip from this heroically patient Spaniard, and hand-machine your own tiny (12 cc displacement) V12. This would be amazing feat of handwork even if it weren’t fully operational (using compressed air injection), but the fact that it works, runs and was made without a single CNC machine is nothing short of astounding.. If, as the book suggests, Shop Class is Soulcraft, this guy is like an engineering bodhisattva, inspiring us with his precision, patience and skill. In a world where not much is made by hand anymore, this achievement is worth taking a few minutes to marvel over… [Hat Tip: Dean Huston]

Hey, it coulda happened!

TTAC commentator HeeeeyJake writes:

Hey Sajeev,

I love the column and I’m a daily TTAC reader, though I rarely comment. We have been a Panther household since the mid nineties, and have had great luck with our vehicles thus far. My parents had two ex-Budget rental Town Cars, a white ’93 with blue interior, and a medium willow green ’96 with that greyish-beige. I had a pearlescent silver ’91 in high school with black interior and a black canvas top (I added ’02 Cartier wheels , P71 front springs, and a dual exhaust with turbo mufflers). All were zero-problem vehicles. Which brings us to our current Town Car, an ’07 Signature Limited, fresh out of warranty, which is also an ex-rental, but I do not know which company.

Yesterday we gave GM kudos for addressing its lingering vehicle weight issues by redesigning the head of its popular 3.6 liter V6, and shedding 13 lbs in the process. It was, we noted, the kind of news that showed GM is staying focused on the nitty-gritty of product development, sweating the details. But, according to a fascinating piece by GMInsideNews, new-product development at GM still has its issues. Specifically, Cadillac’s development of a new BMW 3-Series fighter, known as ATS after its “Alpha” Platform, has faced more than its fair share of what GMI calls “drama.”

Turf battles, unnecessary “wants” on checklists and ultimately a severe case of “Mission Creep” have created a vehicle that now needs a crash diet, according to GMI’s sources both within GM and at suppliers working on the Alpha/ATS program. For a vehicle that’s taking on an institution like the BMW Dreier (not to mention costing a billion dollars to develop), these are troubling signs indeed.