How Fiat MultiAir Technology Works

[sjon]

have a fiat punto 2010 . 1.4 multiair buyed it secondhand already driven 13.000 km with it without a single problem and its cheap with fuel which is great for my job

[Fiatusa_com]

Fiat belt drive engines were turning 13, 000 rpm back in 1970, so they know something about engine design. Plus, look up Paolo Martinelli.

[rosalva]

Works really well when you rev these engines past 4K their timing changes
Valves sounds like a diesel when cold
5w20 is for CAFE
I bought it with 65k in 2019 it’s at about 130k
If you bought it used I’d recommend shortening the oil change intervals a few times, changing when the oil darkens from honey to brown/black.

[hashbrownz]

"your car sucks"
"that thing's gonna break, real quick"
"is your wallet on fire yet?"
"That's a girls car."
"Fix it again, tony!"


*starts modded abarth*

"whoa dude, pretty sick"

Everytime, i promise. every. time.

[mrkutadgu]

Is this Fiat Tipo Cross 1.4L 95bg 16v engine multiair?

[sidneysanders]

My wife has a jeep renegade with the 1.4L turbo and 6 speed manual. Its pretty fun to drive! Love the technology with the multiair, and its really cool that this is a gas engine that doesnt have a throttleplate

[quillmaurer]

I've been pondering a concept like this for years, envisioning the exact same functions and benefits. Looks like they beat me to it. I was visualizing both intake and exhaust valves, and oil could be piped from a camshaft down in the block to avoid the need for timing belts/chains and the compactness of an OHV rather than OHC. As for reliability, I wouldn't be worried about the reliability of this design general, I see that going the same way as EFI and electronic ignition, which might have been troublesome at first but now are very reliable. This looks a lot simpler than a lot of other variable valve timing systems currently on the market. I would worry about the reliability for a different reason though: because Fiat (now Stellantis), they - in fact any brand under that realm (Chrysler/Dodge/Jeep) - don't have a particularly good reputation for reliability or longevity. More issues with build quality than design. If Toyota or Honda made this it would probably run for 500k trouble-free miles, but they don't tend to be as innovative with new concepts. From what I've seen the Italians are great at coming up with revolutionary ideas but struggle with build quality, while Japanese only make relatively conventional things but they run forever.

[JonOlaivar]

Stop saying it's unreliable, it's not. If you change the oil on schedule and put in the oil called for, it'll be no different than any other OHC engine.

[TheHoth]

When you look closely the exhaust cam shaft interacts with the rocker arms of the intake valves. Interesting.

[xrenxshawx]

Good on fuel? My 1.4 alfa gets 30 to 37 mpg uk.

Which is 24 to 30 usa.

Lovely engine with lots of power the guiletta suprises alot of people at the traffic lights.

[TheRumJumbie]

I would assume if there's a loss of a valve 'pump' and thus loss of pressure, that valving won't open completely if at all depending on pressure.
Also I'd assume the solenoid to default to closed if it fails electrically.
It's a clever system, more complex than need be if Aurasystem's full electronically operated system is reliable.

[hannahbraelee]

A lot of you guys are talking about mileage this, and mileage that... Truth is, you're not buying a Fiat 500 for the mileage or the engine... You're buying it because it's a Fiat 500...

[burkett]

For all saying it should have direct injection, I argue that direct injection has the potential to have problems down the road due to carbon build up, Direct Injection doesn't allow gasoline to clean the port or have enough time to allow the detergents in gasoline to do what they are designed to do.

[TheIrishPhantom]

Question... Can it keep the intake valve open as long as it wants to? In other words does the solenoid store the pressure it gets from the camshaft? Is it something that could simulate a bigger race/performance camshaft that can simply be programmed in? Or does it only have infinite control over the intake valves while camshaft pressure is applied to the solenoid?

Sorry if I didn't word this right... hopefully somebody gets it lol.

[ianchesney]

does this tech make the engine more susceptible to failure? it seems pretty complicated.

[velkovskinikola]

how often do these systems fail. I am kind of afraid since a new module costs about 1000 euro and have seen multiple cars offered for sale where the owners advertise they already had to change it

[dlobom]

I have problems getting my foot of the gas as well

[badermohamed]

I have a 2016 Chrysler 200 2.4... it uses the same engine I just need to know how reliable this engine is I had this car for about 3 months now no problems but kind of sketchy at times it burns oil like there's no tomorrow maybe because piston ring bad from factory...

[Draxindustries]

These Multi Air engines are brilliant.
The owners who have problems cheap out on servicing and then condemn this engine when it breaks down. These engines need fully synthetic 0w30 multi air specific oil.
Change the oil and filter regularly like every 5k miles and the internals of the engine will stay like new.
The 18k mile oil change interval should be ignored.
An oil and filter change is a very cheap way to keep the engine healthy.

[alexisamtosta]

One of the best engines in the market. As soon as it came out, it won an award. Its Fiat and the sure know how to build engines.