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Automotive Engineering at it's best (not)

By robo_dev ·
Tags: Off Topic
http://money.cnn.com/2012/06/22/autos/chevrolet-cruze-recall/index.htm?hpt=hp_t2

Read the second paragraph of this article about Chevy Cruze recall:

"The engine shield, a large plastic piece that is installed under the front of the car to protect the engine, could trap oil that is accidentally spilled or dripped during oil changes."

"Also, in cars with manual transmissions, driving with a worn clutch can cause burning hydraulic fluid to squirt from the clutch housing. The flaming fluid can ignite the engine shield leading to an engine compartment fire."

Who knew that a worn clutch causes flaming fluid to be ejected from the transmission! I would pay to see that. That must be a Chevy thing! :)

From GM press release:

"In Cruzes with manual transmissions, continuing to drive with a completely worn clutch may cause hydraulic fluid to be expelled from the clutch housing vent hole. Under certain circumstances, the fluid could be burning as it exits the vent hole. If it contacts the engine shield, the shield may ignite and a fire may spread to the engine compartment."

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Sorry but I read that as a Oxymoron

by HAL 9000 Moderator In reply to Automotive Engineering at ...

a large plastic piece that is installed under the front of the car to protect the engine

Sounds as if they are describing a Sump Guard but making them of plastic isn't really an option let alone making it in such a way that it could collect oil or other fluids.

The Clutch issue seems like a Perfect Bean Counter Job to me where the worn clutch plate causes the pressure plate to lower causing the Slave Cylinder to need to move the piston further in the bore and tilting and allowing the fluid to squirt out when the clutch peddle is pushed or worse still actually exiting the bore.

Both are extremely Poor Design but most likely both where approved by Government Safety Agencies who have lots of Pen Pushing Bureaucrats and no one with any common sense or actual Design Experience.

After all how can you make any plastic strong enough to be a Sump Guard without Webbing which traps spills/leaks. Yes I know it could be Carbon Fiber which is certainly strong enough but then again Carbon Fiber has very poor scuffing characteristics which makes it unsuitable for such a job. After all what's the point of having something solid enough to protect the sump if it disappears when it's rubbed along the ground?

The Clutch Issue is a completely different story and I did notice that there is no listed fix for that. Even replacing the Clutch Plate and so on will not prevent it from happening again when the Clutch Plate wears or the Pressure Plate looses Tension. They need to fit a new Slave Cylinder which is longer.

Col

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Col,I suspect in may be a decorative cover in an attempt

by Deadly Ernest In reply to Sorry but I read that as ...

to provide a more aerodynamic air flow at that point.

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Very Poor Design Regardless NT

by HAL 9000 Moderator In reply to Col,I suspect in may be a ...
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true, very true - and I wonder if it was put in by an engineer or

by Deadly Ernest In reply to Very Poor Design Regardle ...

a graphics artist or a marketing person.

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Sounds like something from a Marketing Type

by HAL 9000 Moderator In reply to true, very true - and I w ...

They mess up everything that they touch.

At least with the 1 car I was involved in the design of we told the Marketeers that they could change whatever they liked provided that nothing was changed other than the paint work.

We also allowed them to change the color of the wiper blades but not the arms.

Luckily that was never designed to be a Mass Production Car just a Limited Production Car which was sold out before it hit the Order Books.

Col

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That's the part you see flapping on so many cars

by robo_dev In reply to Col,I suspect in may be a ...

The shield is typically held in place little plastic clips which get lost/broken over time.

It's purely for aerodynamics and to more or less deflect mass quantities of rain/snow/insects/dirt from building up in the guts of the engine bay.

The point that I find funny is how the press release seems to mention casually what would be a really BAD thing...e.g. flame shooting from the clutch housing.

" worn clutch may cause hydraulic fluid to be expelled from the clutch housing vent hole. Under certain circumstances, the fluid could be burning as it exits the vent hole."

So we're talking burning fluid spraying out of a vent hole...seems like no big deal, just a little flamethrower going under the car, nothing to see here :)

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You've got it now

by HAL 9000 Moderator In reply to That's the part you see f ...

It's a way to improve heating and to help melt the snow traveling under the vehicle.

Add that to the Modern Plastic Fuel Tanks and thin Hydraulic Lines and it's way to sell new cars and Funerals.

Col

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it's a sure way to save on the cremation costs, all happens at the car - nt

by Deadly Ernest In reply to You've got it now
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