Technical MultiAir explained....
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Technical MultiAir explained....
That'll never be used.... just the other day i was speaking about this where i work (work as a mechanic) and the only reason i can think as to why is what IF a intake solenoid fails and sticks open ?????? its gonna bend a valve..... and the way new electrics are going it could fail at anytime.... not saying they wont bring it out, but i think personally it will be a while before they do.
Its a fantastic idea, but as with DPFs, Electric PAS and all the other emissions based nonsense modern cars have, all its going to do is wind people up and cost huge amounts of money to mend. Its definately coming mind, this year I think...
it is coming out, but it's not like the solenoid directly drives the inlet valve
its got an ecu what happens when that breaks, your valve get stuck open an get bent? 
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Theyve been developing it for over 10 years now so they should of got stuff in there to prevent that from happening.
If the solenoid gets stuck, the valve will open and close as it normally does based on the rotation of the camshaft. End of story.its got an ecu what happens when that breaks, your valve get stuck open an get bent?
The solenoid sits between the camshaft and the valve. At high revs multiair is doing nothing, the solenoid valve is fixed and everything works like a conventional engine. At slower speeds it can adjust the profile of the camshaft to cause the inlet valves to not open as much. If it breaks, you just get the normal camshaft profile with full valve opening and normal closing. (And doubtless a warning light on your dashboard.
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why didn't they just invent an engine with no valves an have in take an exhaust working off some other sort of solenoid, so it would make all engines safe
do you mean like a rotary engine?
no a better one, still with pistons but with eletric gates instead of valves
When your engine it spinning at 7,000 rpm, getting all these electric "gates" to open and close at exactly the right time must be tricky. And when the control circuits break, your engine could end up badly damaged.
Multiair is deliberately designed so that as speeds increase, it has less to do, and if the electronics break, your engine may stop, but there should be no physical damage.
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how about valves that open up wards instead of down then
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D4nny8oy
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You mean like a "side-valve" engine?
[ame]http://en.wikipedia.org/wiki/Flathead_engine[/ame]
Like the article says- it's a simple design, but doesn't breathe well (which makes it no good in the modern emissions-driven world).
All this talk of the technology being "guaranteed to be unreliable"- what happens if the cambelt breaks on the 16v FIRE engine?, If a valve spring snaps?, etc... You can't stand around forever using the same technology because it's 'safe', otherwise we'd never progress anywhere! I'm sure back in the day of push-rod engines there were people who mocked the idea of driving the valve train via a piece of rubber rather than a tried and tested gear/chain arrangement.
Rest assured Fiat have been developing this for years, and wouldn't bring it to the market without extensive testing and engineering plenty of 'fail-safes' into the design.
no some thing betterYou mean like a "side-valve" engine?
http://en.wikipedia.org/wiki/Flathead_engine
Like the article says- it's a simple design, but doesn't breathe well (which makes it no good in the modern emissions-driven world).
I'n case you haven't seen it, there is more information here:
http://www.fptmultiair.com/flash_multiair_eng/home.htm
http://www.fptmultiair.com/flash_multiair_eng/home.htm
