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  Topic Review (Newest First)
05-19-2018 06:48 PM
2b2
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

via GMi

The Clever Way Mazda Nearly Eliminates Turbo Lag
Mazda has an elegant solution to spool up the turbo in its 2.5-liter four-cylinder

Road and Track
- CHRIS PERKINS - MAY 7, 2018


As turbochargers become more commonplace, automakers are developing innovative ways of reducing turbo lag. For its 2.5-liter Skyactiv engine in the CX-9 and 6 sedan, Mazda has a couple of simple solutions to get its single turbo spooled up more quickly. Engineering Explained's Jason Fenske breaks it down in his latest video.

Mazda uses a valve in the exhaust that closes below 1620 rpm to create a narrower air passage leading to the turbo. This increases the pressure of the air rushing to the turbo, which helps spool the turbine more quickly. That means you'll have to spend less time waiting for the turbocharger to kick in at low RPMs. The exhaust valve is aided by a four-to-three-to-one exhaust manifold designed to accelerate air out of the cylinders.

A lot of automakers are working on complicated tech to mitigate lag, including electric supercharging. Mazda's solution is much more simple...
04-04-2018 01:14 PM
Assimilator
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Quote:
Originally Posted by Andrew L View Post
Never had a rust issue with my Sable but I was washing it all the time and as soon as the temp was above 32 in RI I would be out there getting the salt and such off the car. It really was still clean and almost new looking when I traded it in but not everyone takes care of their cars like that which is something so simple to do to prevent rust. I am still amazed at how many old cars I see all the time in FL that look great with no rust at all of course the paint in some cases is another story from the brutal sun.
The Sables and Tauruses were notorious for rusting in the wheel arches and inside the front fender. It was not uncommon for a Sable or Taurus in Michigan to rust through it's front floors. It had something do with condensation build up and trapped water. Most of them are extinct up here now. Michigan is a great place to test longterm durability.

https://youtu.be/LGoe3zw_Y9Q
04-04-2018 01:08 PM
ZanatWork
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Quote:
Originally Posted by wingsnut View Post
Plenty of Porsche engineering is what you hear, which basically meant we purchased their design of a similar 60 deg engine and adapted it into the then new 2.5/3.0L family. It's not like a bunch of Germans were sharing our cafeteria in Dearborn overseeing us Americans who worked for years on the all new designs. Seemed like an intriguing idea at the time, but later proved to be equally problematic. We also sub contracted Cosworth for their innovative casting process for block and heads. Much was learned by Ford, regardless.


Both engines shared most parts, differentiated only by bore size. You only hear about durability issues with 3.0L, because Ford put far more of them on the road with Taurus/Sable and Escape/Mariner than they did Contour/Mystique 2.5L. Piston slap and bore wear wear early problems and later corrected, but even today you see many old Taurus 3.0L with well over 200K miles. I had a Contour and several Tauruses and they were among my most dependable cars ever.
I recently had a cheap (and worn out) 99 Mercury Cougar with the 2.5 and the 5-speed. Despite the previous owners' lack of upkeep, that motor was truly sweet when into its powerband...very tractable, and well-matched to the car's overall personality. I actually might seek another as my "cheap commuter" soon, albeit one that's been treated better. Having owned a Contour previous to the Cougar, I actually liked that platform and only the tight rear seat and some fragile interior trim issues dampened my liking for the cars...oh, and the automatic that died in the old Contour. I'd actually trust those cars (with manual transmissions) pretty well.
04-04-2018 01:01 PM
Andrew L
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Quote:
Originally Posted by Assimilator View Post
Actually, at least in Michigan, the biggest issue with those cars were rust, I know my '96 completely rotted out in a couple of years after it hit 100,000 miles. It's one of those vehicles in which the mechanicals way outlived the body. I'm not sure why Ford had such a hard time nailing rust in the 80's and 90s, they seemed to fix it by the 2000s. One of the longest lived Fords I've seen recently is the original Escape and Focus (despite their initial problems). Those I4s run forever and the bodies were relatively slow to rust out, especially the Escape.
Never had a rust issue with my Sable but I was washing it all the time and as soon as the temp was above 32 in RI I would be out there getting the salt and such off the car. It really was still clean and almost new looking when I traded it in but not everyone takes care of their cars like that which is something so simple to do to prevent rust. I am still amazed at how many old cars I see all the time in FL that look great with no rust at all of course the paint in some cases is another story from the brutal sun.
04-04-2018 12:52 PM
Assimilator
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Actually, at least in Michigan, the biggest issue with those cars were rust, I know my '96 completely rotted out in a couple of years after it hit 100,000 miles. It's one of those vehicles in which the mechanicals way outlived the body. I'm not sure why Ford had such a hard time nailing rust in the 80's and 90s, they seemed to fix it by the 2000s. One of the longest lived Fords I've seen recently is the original Escape and Focus (despite their initial problems). Those I4s run forever and the bodies were relatively slow to rust out, especially the Escape.
04-03-2018 11:34 PM
Andrew L
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Quote:
Originally Posted by Assimilator View Post
I remember that being the case for the iron block engines with less valves, definitely not the Duratecs.
There was constant bickering on the TCCA over which engine was better the 3.0 Vulcan or the 3.0 Duratec in terms of reliability. In terms of simplicity the Vulcan won since it was a push rod design. But both were very reliable, as I said there were plenty of members who were able to make it that high on both motors. My Sable had 140k all original minus the spark plugs and wires on my Duratec it was also one of the main reasons I went with the 3.0 vs the 3.9 on the LS when I upgraded the 3.0 was far more reliable than the 3.9 Jaguar based engine. The weak point on the Tauruses and Sables during those years was the transmission but not the engines.
04-03-2018 11:03 PM
wingsnut
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Plenty of Porsche engineering is what you hear, which basically meant we purchased their design of a similar 60 deg engine and adapted it into the then new 2.5/3.0L family. It's not like a bunch of Germans were sharing our cafeteria in Dearborn overseeing us Americans who worked for years on the all new designs. Seemed like an intriguing idea at the time, but later proved to be equally problematic. We also sub contracted Cosworth for their innovative casting process for block and heads. Much was learned by Ford, regardless.


Both engines shared most parts, differentiated only by bore size. You only hear about durability issues with 3.0L, because Ford put far more of them on the road with Taurus/Sable and Escape/Mariner than they did Contour/Mystique 2.5L. Piston slap and bore wear wear early problems and later corrected, but even today you see many old Taurus 3.0L with well over 200K miles. I had a Contour and several Tauruses and they were among my most dependable cars ever.
04-03-2018 09:58 PM
Assimilator
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Quote:
Originally Posted by Andrew L View Post
History is correct but not the short life part, the Duratecs in the 90s Tauruses were pretty **** reliable I remember reading about members who had 200 even 300k miles on their Duratec Taurus and Sables.
I remember that being the case for the iron block engines with less valves, definitely not the Duratecs.
04-03-2018 09:49 PM
Andrew L
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Quote:
Originally Posted by Assimilator View Post
Weren't the Duatec V6 engine designs purchased from Porsche and developed with Cosworth for the 1993 Mondeo. How much of this engine was actualy Dearborn designed?

Duratec were great performers but notorious for their short lives.
History is correct but not the short life part, the Duratecs in the 90s Tauruses were pretty **** reliable I remember reading about members who had 200 even 300k miles on their Duratec Taurus and Sables.
04-03-2018 09:14 PM
Assimilator
Re: what the heck is SkyActive? (HCCI/hyper/EV updates)

Weren't the Duatec V6 engine designs purchased from Porsche and developed with Cosworth for the 1993 Mondeo. How much of this engine was actualy Dearborn designed?

Duratec were great performers but notorious for their short lives.
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