Cam phasing is why external EGR systems were phased out.  Being able to adjust overlap on the valves allows us to adjust INTERNAL EGR, giving the same benefit as an external system, but without all the complexity.  However, internal EGR is hot, so there may be a knock penalty associated with it.  It’s starting to make…

Sorry, I wasn’t thinking clearly.  While EGR can provide a knock benefit, the main purpose is pumping work reduction.  Because the fresh air charge is displaced, the throttle is opened more to make the same torque, so the manifold pressure is raised, and work is reduced.  Sorry about that.  The last project I worked…

I need to correct myself a little. Knock IS a benefit, but the primary benefit is pumping work reduction. When you introduce EGR, the displacement of the fresh air charge means you have to open the throttle a little more to make the power, so that reduces pumping work of the engine, so less energy goes into pumping…

Understeer is when the front of the car hits the wall, oversteer is when the back hits the wall.   :)

It’s primarily a fuel economy technology (which also does mean emissions) because it reduces knock at light to medium engine loads. There will be some unburned hydrocarbons (fuel) in the exhaust gas, but it’s a very tiny amount compared to the fresh fuel being injected.

Maximum power is unaffected since at high loads…

Whew, some misinformation on this thread. EGR dilutes the fuel air mixture with inert gas (exhaust). This slows down combustion a bit, and reduces knock. That’s the main reason for it, to reduce knock at light to medium loads. Deleting an EGR system will reduce fuel economy and increase emissions, not to mention you…

Development cost.  Probably cost a couple million to develop the fridge, but it cost a few BILLION to develop that car. 

No.  There are a couple of reasons.  First is that the starter temperature is modeled in the PCM, so if it the PCM thinks the starter is too hot, it won’t shut the engine off. 

Less complicated than a printed circuit board. 

“The pushrod V8 will die.” Not too soon, I think. GM is doing pretty well with their pushrod engines. With the variable displacement technology, and the 2019 Silverado’s ability to turn all cylinders on and off as needed, the benefit of being able to phase the cams independently is reduced.  VDE allows you to…

It probably took them 2 minutes to pop it neutral and push it out of the garage, no real time wasted.

Email the mayor of Durham.  I emailed him once to show the water curtain stop signs, and he actually responded, forwarding my email to the engineering department. 

There are shields, but after a WOT run like that the whole exhaust is near 1500F. No reasonable shielding can prevent that from lighting grass on fire.

I wish the speeder was charged with starting fire for pulling over to the left.  There was a perfectly good shoulder to the right. 

A lot of times there will be employee feedback trials for certain things.  I had the chance to do an audio trial for a Lincoln.  I don’t recall if it was the Aviator, it’s been a while, but while I’m not an audiophile, I was REALLY impressed with the sound quality of the audio.  It really sounded like a live…

Keep in mind that it only cranked, it didn’t start. My money is on a poor installation of a remote car starter, since that is a system that is connects to both the door locks and the starter.

For the most part, we design the cooling system for the hottest conditions, and the thermostat will take care of cold temperatures.

In cold, the hardest thing is starting the engine, since fuel wants to turn into liquid and it’s fuel vapor that combusts, not liquid fuel.

Get off my lawn!

Yea, but that’s the American way, finding loopholes to get what you want. 

I wonder why she stayed in the car so long.