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kb58
kb58 Dork
11/7/15 3:13 p.m.

https://www.youtube.com/watch?v=PSuB4rfw0Zk

Just amazing... I had no idea. Needless to say, it's coming off!

Rufledt
Rufledt UltraDork
11/7/15 3:17 p.m.

Well that explains it!

Cotton
Cotton UberDork
11/7/15 3:19 p.m.

Wow!

Cooper_Tired
Cooper_Tired Reader
11/7/15 3:28 p.m.

Was not expecting that!

bgkast
bgkast UberDork
11/7/15 3:28 p.m.

Man that sucks!

Hahahaha.....ah I Crack myself up.

T.J.
T.J. UltimaDork
11/7/15 3:34 p.m.

In reply to bgkast:

You beat me to it.

T.J.
T.J. UltimaDork
11/7/15 3:34 p.m.

In reply to kb58:

Glad you figured out the culprit.

The0retical
The0retical Dork
11/7/15 3:37 p.m.

That's not at all what I expected to see when you presented that problem.

kb58
kb58 Dork
11/7/15 3:37 p.m.

With perfect hindsight... well... of course. Figure there's probably maybe 5 psi inside the scoop, and 15 psi on top, for a difference of ~10 psi... per square inch. Multiply that by the area and there's probably 200 pounds on that thermoplastic scoop. Stupid me.

The only saving grace is that I figured it out my own without having someone spell it out... It'll be replaced with a better shaped part, probably carbon, just 'cause.

MrJoshua
MrJoshua UltimaDork
11/7/15 3:51 p.m.

Lol-that's awesome!

dean1484
dean1484 MegaDork
11/7/15 4:23 p.m.

How did you figure that out?

Knurled
Knurled MegaDork
11/7/15 4:29 p.m.

Yup, that'll do it

alfadriver is cleared to engage Smug Mode

Nick (Not-Stig) Comstock
Nick (Not-Stig) Comstock UltimaDork
11/7/15 4:32 p.m.

WOW!

ssswitch
ssswitch HalfDork
11/7/15 4:43 p.m.

Well, at the very least this is a really bad-ass problem to have.

Boost_Crazy
Boost_Crazy Reader
11/7/15 6:15 p.m.

Wow. I guess those who said that the intake pipe was collapsing get partial credit.

kb58
kb58 Dork
11/7/15 6:33 p.m.
dean1484 wrote: How did you figure that out?

During a test drive last week, I heard something when the MAP drop occurred (hadn't heard it before). Opening the engine cover showed that the air filter had slipped off one side and had seemingly gotten sucked onto the bell-mouthed intake tube (that actually hadn't happened completely). Thinking that was it, the air filter was upgraded and a support added across the airbox under the filter. At the same time I was getting suspicious of some witness marks which had gradually appeared on the scoop, and that started the "could it have collapsed" theory. I'm amazed it could flex that many times and not have way more damage.

Said witness marks, the two light gray marks along the top edge of the air inlet. The picture here shows the assembly without the air filter in place and you can see the bell-mounted inlet:

mad_machine
mad_machine MegaDork
11/7/15 6:38 p.m.

well, I am highly impressed by the collapse.

petegossett
petegossett PowerDork
11/7/15 7:16 p.m.

Time for a Can-Am style scoop up over your head???

Fueled by Caffeine
Fueled by Caffeine MegaDork
11/7/15 7:38 p.m.

Awesome you found it. I believe I suggested that the intake was sucking itself closed, but I thought it would be the air filter collapsing, not that.... Good troubleshooting.

mad_machine
mad_machine MegaDork
11/7/15 8:12 p.m.

how flexible is that scoop anyway? I bet something made of a much more rigid material would not suck quite so much..

Just out of curiosity, why a backwards facing scoop anyway?

Kenny_McCormic
Kenny_McCormic UltimaDork
11/7/15 8:30 p.m.

That was funny, probably not for you though.

Build a stronger/taller one from fiberglass?

kb58
kb58 Dork
11/7/15 8:48 p.m.

The windscreen causes a big rotating air bubble that extends from the back of the car to the aft side of the windscreen, so there is no "ram effect" to be had. Also, any rocks kicked up by the front tires (and rain) won't find its way into the air filter with it pointed aft. Lastly, it cuts down somewhat on noise - induction noise with it pointing forward would be even worse than it is (that said, I always wear ear plugs).

Dusterbd13
Dusterbd13 UberDork
11/7/15 9:15 p.m.

Holy E36 M3

kb58
kb58 Dork
11/9/15 1:53 p.m.

What amazes me most is that it collapsed dozens of times yet always sprang back to shape as if "what, nothing's wrong here" - other than the tiny witness marks.

GameboyRMH
GameboyRMH MegaDork
11/9/15 2:18 p.m.
kb58 wrote: What amazes me most is that it collapsed dozens of times yet always sprang back to shape as if "what, nothing's wrong here" - other than the tiny witness marks.

Makes me wonder if there might be some useful application for collapsing-scoop technology

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