https://www.youtube.com/watch?v=PSuB4rfw0Zk
Just amazing... I had no idea. Needless to say, it's coming off!
https://www.youtube.com/watch?v=PSuB4rfw0Zk
Just amazing... I had no idea. Needless to say, it's coming off!
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.
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:
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.
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?
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).
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.
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