Technical Swirl flaps

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Technical Swirl flaps

Note sure my flaps are working anyway. A test while reving the engine in neutral from idle either smoothly through the range to 4000krm or blipping through the range does not appear to move the bar. On can only just see a tilt in the bar as though it wants to move but this is all.

Could be that one needs real load and vacuum on the engine to really activate them.

Now a question for anybody to confirm / correct.

When the engine is powered off are the swirl flaps in the fully open position, then move to closed / modulated in the 1K to 2 or 3K rpm range and are fully open again are higher rpm? I have read this somewhere before and have quoted it myself but am now a little puzzled / confused.

Over to the experts.

Just seen this video of the Vectra manifold and it definitely looks like the flaps are fully OPEN in the rest position ( Inlet manifold Vectra C 55210201 - YouTube ) which is good news. i.e
my ball joints are always far left positioned.

hi,

thanks for posting this video it is very helpful.

but i am still confused on open/closed and left and right??

which is which?

thanks
 
sorry for thread resurection, but the software date on my 2005 Croma is from late 2007 - so there must have been an update.
 
The only other explanation I can come up with is that Fiat did a late ECU update (my car was produce in Sept 2005, purchased in Dec 2006) which was applied during manufacturing or as a required/manditory update prior to vehicle sale. I don't have access to SIGI to check out if there were any ECU updates to the Croma. Such an update could knoble or drastically reduce the valve operation. Also as we know Fiat have removed swirl valves from the later generation diesel engines.

A quick ECU update depsite the vehicle still having all the hardware would be an effective way of reducing warranty claims on high mileage within warranty vehicles.

Does your head hurt? Mine does......nothing seems to be straight forward anymore!

Sorry,my last post was out of context without this!!

My croma's software is dated from 2007, so supports Nick theory.(y)
 
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