Hi All.
Some thoughts on this one.
As the Variable Air Intake system has been removed from the 8gen 2017 models, was looking at tidying up some plumbing and hardware by removing this system. See attached and a photo of the 2017 air filter cover.
[image: Variable Air Intake.jpg]
[image: IMG_0325.JPG]
Sounds like a reasonable job. Are you intending trying it with hose blocked and solenoid disconnected first before removing the rest of the gubbins?
I'm interested to see if you notice any effects. Previous owner d/c'd and blocked the hose on mine and I honestly couldn't tell a difference when I reconnected it. But that may have been simply that I was changing so much stuff at the time
9 hours ago, finkSounds like a reasonable job. Are you intending trying it with hose blocked and solenoid disconnected first before removing the rest of the gubbins?
Hi Fink.
Good point. I do intend on running the bike with the hose removed and blocked from the flapper diaphragm, by default the flapper is in the open position. If there's no noticeable change in performance l might go ahead and remove the stuff.
This may have come up before, but if anyone can tell me the benefit of all this hardware (which Honda have now removed), I'd like to know. Given that we are all riding around with air filters with varying degrees of flow rate, some OEM, some aftermarket, some very dirty others might be clean, surely this would have a greater impact, than simply altering the inflow air availability?
Cheers.
Grum tbh I have no idea. I have a pipercross installed as opposed to theOE filter.
I have only read as you no doubt have what others have achieved on other gens ( I hate those words) and how they feel it has gone. As no doubt we both know only dyno ( cue rectal or gator) time will reveal any benefits.
I would happily give it a go but live in the Highlands of Scotland hundreds of miles from civilisation, let alone a dyno🦖🦖🦖🦖🦖.
Thanks for the info Fink.
Have plugged the vac hose to the diaphragm, about to see how the bike goes over a few weeks.
Cheers.
9 hours ago, finkI would happily give it a go but live in the Highlands of Scotland hundreds of miles from civilisation, let alone a dyno🦖🦖🦖🦖🦖.
So where are you???
https://www.roughguides.com/article/remote-places-in-scotland/
Been to a few of the places mentioned, St. Kilda on my bucket list...
Afaik it's Honda's attempt to make a variable geometry intake manifold, just without the variable geometry. There's a lot of surprisingly complex fluid Dynamics that goes on in an engine intake (exhaust too) due to the fact that the valves are not constantly open. What you get are a lot of high flow/low pressure and low flow/high pressure instances at the valves, which create pressure waves that resonate back out and around the air box chamber. If you tune the shape of the chamber just right, you can create positive pressure zones at just the right times to help fill (and negative zones evacuate, from the exhaust side) the cylinders. Of course, since the frequency of the valve openings changes with rpm, this effect only works at certain engine speeds--helping create the power band. A variable geometry intake could theoretically 're-tune' itself across multiple rpm ranges, thus widening the power band and making the engine more versatile. I believe Volvo was/is playing around with this in their cars, but Honda may have tried to do something similar with the vfr by changing not the geometry, but the amount (and thus, pressure) of intake air at certain rpm ranges.
All this to say I think it's there to strengthen your low and mid-range, but I don't know for certain.
6 hours ago, DutchySo where are you???
https://www.roughguides.com/article/remote-places-in-scotland/
Been to a few of the places mentioned, St. Kilda on my bucket list...
live about 40 miles from the first one listed in the rough guide article. The Mallaig Ambulance crew have to take the lifeboat over as its quicker than going by road.
I live on the Ardnamurchan peninsula. About 20 miles from HERE, also the Western most point of the British mainland
After approx 400k's with the system disabled and the flapper in the fully open position, I can honestly say the bike is as Good if not Better than with the system operational SUBJECTIVELY speaking.
Tried a number of riding variables from idle to red line, the bike performs as good as ever. SO, if its good enough for Honda to remove this system from the 2017 model, I'm going to remove all this hardware clutter ASAP.
Cheers.
Post Edit - Yesterday 14/Dec/17. Removed all hardware as per top drawing and plugged main vac hose, bike running fine.