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Old 28-01-2010   #1
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MultiAir Interference

This is not a specific Punto question, but since it (Punto Evo) is the first car to receive this engine, it makes sense to ask here (or possibly 'Grande Punto' section, why couldn't they just carry on with the regular naming convention?). Is the new Fiat MultiAir engine non-interference? The reason I ask is that the valve actuation is electronic, and I wouldn't fancy the Fiat electrical gremlins causing a piston-valve scuffle.

I've spent quite a bit on my car over the last two years, and if anything major goes wrong again, I am going to have to consider whether it is economical. I would consider a Punto Evo MultiAir, but not a chance if it is an interference engine
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Old 28-01-2010   #2
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Re: MultiAir Interference

are the Multi airs NA too. doesnt seem to be a new T-Jet in the range
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Old 28-01-2010   #3
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Re: MultiAir Interference

Quote Originally Posted by CLXCraig View Post
are the Multi airs NA too. doesnt seem to be a new T-Jet in the range
Indeed they are (at least for now). Must be reasonably special to get 133 BHP out of a naturally aspirated 1.4 and still meet EURO5 emissions standards.
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Old 28-01-2010   #4
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Re: MultiAir Interference

I can't spot a turbo charged one on their site, it is always possible they are holding back on it for a new set of adverts in the coming months or simply haven't finished it or think it's needed.
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Quote Originally Posted by TurboSei View Post
Anyway. Enough chatter, more arse action!
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Old 28-01-2010   #5
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Re: MultiAir Interference

The valves probably fail shut so maybe less catastrophic when it does go t*ts up.

Courtesy Google: http://www.fiat.co.uk/Content/?id=10857

Personally I would like to see turbocharged 2 stroke diesels. They dont use the crankcase for breathing so they dont clatter like scooter engines and are amazingly powerful. They also dont need poppet valves, cams, mutiair, etc
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Last edited by DaveMcT; 28-01-2010 at 14:16. Reason: new info
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Old 28-01-2010   #6
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Re: MultiAir Interference

Quote Originally Posted by WhiteSei View Post
The valves probably fail shut. I cant see how that makes it more reliable though maybe less catastrophic when it does go t*ts up.
That would be safer in the event of a power failure. However, if someone in the ECU programming department has not taken into account cumulative rounding errors or memory leaks when it comes to the engine phase variable, the engine could quite easily fall 90 degrees out of phase, much like a cambelt jumping teeth.
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Old 28-01-2010   #7
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Re: MultiAir Interference

On the plus side, can you imagine the tuning possibilities once someone works out how to remap these babies?
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Old 28-01-2010   #8
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Re: MultiAir Interference

It works by leaking oil out of the inlet cam followers so if the cam drive fails at the very least exhaust valves will hit pistons.

Dirty oil will be a nightmare
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Old 28-01-2010   #9
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Re: MultiAir Interference

Quote Originally Posted by WhiteSei View Post
Dirty oil will be a nightmare
True, never mind checking the oil, CHANGING the oil will be part of the weekly check
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Old 01-02-2010   #10
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Re: MultiAir Interference

The evo sporting 135 is turbocharged i just ordered one, cant wait till it comes, roll on March!
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Old 01-02-2010   #11
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Re: MultiAir Interference

Quote Originally Posted by MikeSalt View Post
Indeed they are (at least for now). Must be reasonably special to get 133 BHP out of a naturally aspirated 1.4 and still meet EURO5 emissions standards.
I retract this statement, the 135 is indeed turbocharged. Oops
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Old 01-02-2010   #12
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Re: MultiAir Interference

Quote Originally Posted by harmani View Post
The evo sporting 135 is turbocharged i just ordered one, cant wait till it comes, roll on March!
Thanks for letting us know
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Quote Originally Posted by TurboSei View Post
Anyway. Enough chatter, more arse action!
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Old 01-02-2010   #13
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Re: MultiAir Interference

Lucky booger. Enjoy
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Old 01-02-2010   #14
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Re: MultiAir Interference

The new MultiAir engines have electrinic inlet valves. The cam belt only drives the exhaust valves. As the inlet valves are opened electrinically I dont believe there is an inlet cam? The cam belt should be under less stress than a conventional engine so cam belt failures should be rare.
Whether engine is interference or non inteference I dont know. A lot of toyota engines are inteference. Cam belt failures and valve colisions are rare on Toyotas. It all comes down to good design and good maintenance.
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Old 01-02-2010   #15
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Re: MultiAir Interference

The MultiAir is an evolution of the 1.4 16v FIRE engine which was always an interference engine- I'd put good money on the MultiAir being no different.

There's plenty of presentation video's on Youtube that show the basic operation of the system.
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