Swirl flaps again, sorry - Alfa Romeo Forum
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(Post Link) post #1 of 9 Old 12-08-16 Thread Starter
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Swirl flaps again, sorry

I have read conflicting reports about the removal of swirls flaps, if you take them off a problem is removed forever, but what happens to the response of the engine, what does it affect? As far as I can see mine are OK but I worry about the consequences of failure. My logic is they must be fitted for some reason, is the difference, on or off massive?
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Crossed my mind too Phil.
I think if I keep this car an EGR delete will happen but beyond that I don't know. I read somewhere the swirl flaps are not as disastrous on the 2.4 as they are on the 1.9 if they fail. Not sure what that means exactly.

Was not this thread but if you have not read it.
http://www.alfaowner.com/Forum/alfa-...-manifold.html (2.4 jtdm intake manifold!)
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Originally Posted by Wezley View Post
Crossed my mind too Phil.
I think if I keep this car an EGR delete will happen but beyond that I don't know. I read somewhere the swirl flaps are not as disastrous on the 2.4 as they are on the 1.9 if they fail. Not sure what that means exactly.

Was not this thread but if you have not read it.
http://www.alfaowner.com/Forum/alfa-...-manifold.html (2.4 jtdm intake manifold!)
I had the swirl flaps removed and EGR delete by Autolusso on my 1.9 Q2 GT and I find the car to be far more responsive than when they were fitted, its like having the sport button permanently on.

They're a time bomb on the late JTD's
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(Post Link) post #4 of 9 Old 12-08-16 Thread Starter
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I cannot decide what to do with my Brera, it ticks all my need boxes except one (not a V6) . I have deliberated for some time and decided to keep it for the foreseeable future. I think the answer is to get the swirl flap threat removed, so when the belts become due for a change, anytime in the next few months I will change the manifold for a non swirl type and see how it goes, if its a dog I will be able to revert back. Well thats todays plan anyway.

Last edited by Philjay50; 12-08-16 at 11:56.
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Basically, all the swirl flaps do is interrupt the air flow on one of the inlet valves per cylinder at tickover to aide starting and low rev performance, but you wont notice any difference, and neither will the engine with them removed. Just one less mechanical thing to go wrong.
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Quote:
Originally Posted by Wezley View Post
Crossed my mind too Phil.
I think if I keep this car an EGR delete will happen but beyond that I don't know. I read somewhere the swirl flaps are not as disastrous on the 2.4 as they are on the 1.9 if they fail. Not sure what that means exactly.

Was not this thread but if you have not read it.
http://www.alfaowner.com/Forum/alfa-...-manifold.html (2.4 jtdm intake manifold!)
Swirl flaps are not as disastrous on the 2.4 20v, they very very rarely break off and give immediate expensive engine failure, but if anything on the 2.4 you can be almost certain that they will start to leak at some point sooner or later, and if ignored will start to cause running issues. This isn't the case on the 1.9, on the 1.9 they don't leak, they don't cause running issues, they just operate as they should until the day the 2nd spot weld breaks and the flap enters the cylinder and things get messy with no prior warning. I would say to 1.9 owners, sort your swirl flaps out now. To 2.4 owners, sooner or later your swirl flaps will give running issues so sort them out then, or sort them out at your next cambelt change whichever comes sooner as there is a bit of a labour saving doing both jobs together.

Initially the air that leaks passed the swirl flaps just gives a little roughness to the cold start, but eventually it gets to the point where the car can't hold itself at idle when cold without throttle input or stalling, the air leaking while under boost results in poor performance, excessive black smoke which clogs the EGR & DPF, generally not good. It can also lead to overspeeding of the turbo which isn't good for longevity. This is almost a certainty, as the swirl flaps operate they wear the bushes in which they turn, about as certain as a 156 will wear its upper wishbones as you drive up and down a poorly surfaced road. You have two choices, a new inlet manifold at approx 350 plus labour to change, or a swirl flap delete at approx 80 (weld the manifold) plus labour to remove/refit.
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Autolusso Penrith - UK's leading independent Alfa Romeo specialist with branches in Bedfordshire, Cumbria & Dorset

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Last edited by Pud237; 14-08-16 at 10:20.
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I was advised that if you measured exact then the torque kicks in at slightly later revs but barely noticeable in reality.
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(Post Link) post #8 of 9 Old 14-08-16 Thread Starter
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Thanks for that info PUD, it's what I was looking for. My car is used mainly for travelling in Europe, I have this little voice in my head warning me as I drive up and down the motorways of impending doom. To be honest my car does not demonstrate any issues mentioned, indeed, it functions as designed, which is why I like it, just wish it was a V6 with 2.4 economy. Just a thought, what are people's thoughts about changing the manifold as part of a belt job, I have a Flap free version that could be used.
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If you want your flap-free inlet manifold fitted & EGR deleted just let me know, we always do a good deal when doing both jobs together.
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