Auto stop start and turbos

[jaz13]

On the other hand, if Ford's engineer's didn't have to squeeze every last MPG out of it, but instead were instructed to squeeze every possible mile of longevity out of the engine, do you think it would have stop/start in that case? I don't.

It's been a long, long time since engines needed to be replaced/rebuilt because they "wear out". Modern design, materials, manufacturing techniques, and lubrication make engine wear a non-issue. Stop-start does not change that.

 

[RivRaptor]

Jabroni619 The oil pressure is what suspends the crank shaft, rods & cam shaft in the bearings. As soon as you lose that your metal on metal until pressure returns. Sure there is oil residue left but not enough for a high torque take off IMO. Me personally I would'nt want to rely on that alone if you wanted a long life out of your engine. I would rather have oil already under pressure then oil residue on a high load / torque take off...just running a moment ago is not a good idea / excuse and I still stand by that. If that's how you want to treat your truck by all means....continue.

 

[rtmozingo]

The truck was designed to work with auto start/stop. It saves gas, quite measurably, and that's why everyone is starting to adopt it. Ford turbos have not had engine-off cooling concerns since the first gen ecoboost. If it was a problem, the manual would mention it - not to mention many discontented owners.

All the components affected by the increased duty cycle have been beefed up. The starter can see much more use, and the whole circuitry has been revamped. Even if you don't use auto start/stop, you get better components, so you shouldn't complain.

Since there's a lot of BS in this thread, here's a video to counter the crap on the first page:

 

[RivRaptor]

Wow! 2 cylinders less, 500 pounds lighter, closing Rad vents, stop start tec, etc and barely 2 mpg better then my Gen 1 6.2 dinosaur. Impressive! Designed to work, yeah that's always
a guaranty of functionality!

 

[jabroni619]

Jabroni619 The oil pressure is what suspends the crank shaft, rods & cam shaft in the bearings. As soon as you lose that your metal on metal until pressure returns. Sure there is oil residue left but not enough for a high torque take off IMO. Me personally I would'nt want to rely on that alone if you wanted a long life out of your engine. I would rather have oil already under pressure then oil residue on a high load / torque take off...just running a moment ago is not a good idea / excuse and I still stand by that. If that's how you want to treat your truck by all means....continue.

This high torque condition you speak of... I can only think of two scenarios where this happens. If you’re towing, in which case start stop is disabled. Or you’re doing a stop light to stop light race or showing off, in which case you’re in sport mode and start/stop is disabled. In other words. A non-issue.

 

[RivRaptor]

So you guys know I hope I don't sound disrespectful or testy with my responses (My kid has been in the hospital for a few days with a bad infection so I am probably a little testy), I'm just sticking up for my opinion. Hey, engineers don't always have our best interest in mind when designing a new feature or component. There's a guy in another thread that just lost a motor @ 36K. Dealer is guessing he spun a bearing. For those that don't know what's entailed with that: there are 2 half flat circles surrounding the crank & rods journals. When there is a loss of pressure or oil the other surface will grab one of the half's and spin it around causing metal shavings and large area to bleed off any existing pressure, hence bye bye motor. Did start stop contribute to this, maybe, maybe not. But it was designed not to do this. Assuming he didn't run it low on oil!

 

[Loufish]

Low or no oil pressure is generally frowned a pawn last I heard. Stomping on the gas from a start off position with a 6K lb. truck (Empty) with no pressure built up can't be good. Could have something to do with Ford disabling the feature in tow haul mode. Maybe I'm old fashion but I have been messin / building engines since high school and I don't trust it. I like cool runnin high oil pressure motors. Dis-able it in Forscan & forget about it! I did. Plus in hot climates AC doesn't suck as bad! IMO.

I agree...There is plenty of oil on the valve train, but no oil wedge on the crank until there is oil pressure...I get 'it...Ford must know something I don't because they built it that way...But I NEVER stomp on the gas on a cold eng or one that's been running for a whole second...

I also agree many parts were beefed up for Stop/Start, but think how long they'll last if they're not exposed to that environment?

 

[rtmozingo]

Wow! 2 cylinders less, 500 pounds lighter, closing Rad vents, stop start tec, etc and barely 2 mpg better then my Gen 1 6.2 dinosaur. Impressive! Designed to work, yeah that's always
a guaranty of functionality!

Alright, what you got?

 

[RivRaptor]

Cruising to the River (Colorado) avg. speed 80mph, 250mile trip averaged 15mpg, flat, some hills in my 2012 sold @ 99k miles, 2018 6k miles so far same route with about 5 plus trips haven't got better than 17! No tune on either. Also a buddie has a F150 with the 3.5 and averages 17Mpg no 4wheel & smaller tires. You lay into these turbos at all an milage goes down. Not impressed with the mileage on these eco's….like the power though!

 

[Edbert]

I've already opined as opposed to the tech but I will say that idling uses fuel, and surprisingly large amounts with the air conditioner running.

Just last week I needed to sit in my Jeep for about 30 minutes. Details of why are irrelevant, but when I parked my average MPG showed 18.4 and when I started the engine later (after the ~30 minutes of idling session) it was down to 15.8. My gauge resets when I fill up, so that was after 1/4 to 1/3rd of the 16 gallon tank. This was with the AC running in about 90 degree heat.

Idling for more than a minute on frequent occasion WILL lower your mileage. I'm just willing to pay a bit more for gasoline to keep the valvetrain and turbos well oiled.