Piston Slap: When to Step Away From the Drawing Board? REVISITED

After our last installment, I feel nothing but regret for [s]misrepresenting[/s] butchering TTAC Commentator Arthur Dailey’s query. Because people do get in their car to warm it up before beginning the process of rooftop snow removal. And they’d prefer to remove roof snow, not snow that fell into power window switch pods.

So after multiple emails, a promise to try again. To which Mr. Dailey’s reply was:

“OK. But perhaps you could expand that to explain something related to car design? Which is why I sent the question to your attention.”

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Piston Slap: When to Step Away From the Drawing Board?

TTAC Commentator Arthur Dailey writes (and edited to remove confusion):

Sajeev,

Opening my 2011 Hyundai Sonata’s door this morning after a beautiful overnight snowfall (Yes, it takes that long to answer Piston Slap questions – SM), I once again was confronted with a driver’s seat and inside door panel, covered in snow.

Those living in the snow belt will often park their car at the rink, library, ski hill, mall, at work etc. and return to find it covered in snow. You don’t bring your scraper with you in these situations. And even if you use your glove/arm/hand to clear some of the snow, when you open your door, the residue falls. Onto your power window/mirror/door lock mechanisms. And often onto the seat. You get into your car and start it to warm it up and help clear the windshield. And that residue melts.

This is a re-occurring problem: happening in many other vehicles that I have recently rented/owned. With the sloped roofs now common on cars, snow regularly falls into the passenger compartment when you open the door. There used to be gutters/sills along the edges of car rooflines. In fact I believe that up until the 1960’s they might have been an optional extra, as they were often chromed. Later they were just an integrated part of the roof.

I can’t remember exactly when roofline gutters disappeared from cars, but I understand that this was probably due to aerodynamic issues. I also noticed that there are a number of aftermarket options now available, sometimes referred to as ‘rain guards’.

However why can’t auto designers develop a roofline that prevents snow from dropping onto the car seats whenever the door is opened?

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