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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: cycleman on October 05, 2019, 08:01:46 PM

Title: K100LT Fresh Air Vents
Post by: cycleman on October 05, 2019, 08:01:46 PM
I've seen these in the Riders Handbook for the K100LT, but I can't find any information on them, if they worked , could they be retrofitted to a K100RT for example.  Any info out there would be appreciated.
Title: Re: K100LT Fresh Air Vents
Post by: johnny on October 06, 2019, 08:16:18 AM
greetings...

as opposed to stale air vents...

how abouts you poast up some photos so somebody other than yourself know what you talking about...

j o
Title: Re: K100LT Fresh Air Vents
Post by: cycleman on October 06, 2019, 10:04:22 AM
I have a picture in my Rider's Handbook, but it is small and poor quality so not worth trying to reproduce.  They are shown in the following parts diagram from Bob's BMW. I haven't been able to post a picture from the BMW Microfiche but they are shown under:

K100LT Frame, Body, Faring, Luggage (46) - 46-0117 - Casing Upper Part/Light Part numbers -46 63 2308089 and 46 63 2308090. The frames are the next two part numbers.

I tried attaching a photo but no luck. Maybe they were a US item only but the microfiche system would allow me to add them to my cart, so they must still be available somewhere.

Title: Re: K100LT Fresh Air Vents
Post by: johnny on October 06, 2019, 10:11:55 AM
greetings...

look... you could have poasted photos or screen shots or at the very least a link... butts you chose not too... so im gonna look it up this one time for you...

is it #2 in this screen shot...


* whack some more.png (48.59 kB . 768x481 - viewed 76 times)

j o
Title: Re: K100LT Fresh Air Vents
Post by: cycleman on October 06, 2019, 10:14:02 AM
Thank you.
Title: Re: K100LT Fresh Air Vents
Post by: johnny on October 06, 2019, 10:21:26 AM
greetings...

retrofit... just cutts a whole in there and snapp them in...

now a question for you...

its not a fresh air intake... its a flap... now how the hell you expect to getts help here if you dont poast photos poast screen shots poast links... and miss identify the part...

answer my question... i wanna know...


* toolazy.jpg (66.14 kB . 768x477 - viewed 76 times)

j o
Title: Re: K100LT Fresh Air Vents
Post by: cycleman on October 07, 2019, 07:52:02 PM
I can see that went well.  BMW calls them Fresh Air Flaps. My mistake for calling them a vent.
Title: Re: K100LT Fresh Air Vents
Post by: Laitch on October 07, 2019, 08:45:34 PM
I can see that went well.  BMW calls them Fresh Air Flaps. My mistake for calling them a vent.
That flap on the LT fairing doesn't seem to be a common feature on them when a review of online photos is undertaken. Maybe somebody who has one will chime in here. It's purpose eludes me, unless it's an escape hatch for a gerbil.
Title: Re: K100LT Fresh Air Vents
Post by: daveson on October 07, 2019, 08:59:35 PM
I have them,  but not on my registered bike.

Then there are also three slots in the "black infill panels" in front of your lower legs (don't know the proper word) I think it's to cool your lower legs on a hot day.

When I first started riding my brick (which was parked for years) my lower legs got hot from the engine heat,  for some reason it went away after a while.

I don't think there will be much benefit, and bricks are already unsymmetrical enough.
Title: Re: K100LT Fresh Air Vents
Post by: Laitch on October 07, 2019, 09:05:03 PM
I think it's to cool your lower legs on a hot day.
I don't think the query was about theory, daveson. Your moto has them. Did they have a measurable effect on comfort?
Title: Re: K100LT Fresh Air Vents
Post by: daveson on October 07, 2019, 09:10:58 PM
I've never tried them,  my registered bike doesn't have them.  But on a hot day my lower legs are the last thing that bothers me. But I just soldier on,  cause the pleasures greater than the pain.
Title: Re: K100LT Fresh Air Vents
Post by: Laitch on October 07, 2019, 09:19:41 PM
I've never tried them, . . . .
NEXT!
Title: Re: K100LT Fresh Air Vents
Post by: daveson on October 07, 2019, 09:30:24 PM
You havn't asked me if I know anyone who has them.
Title: Re: K100LT Fresh Air Vents
Post by: Laitch on October 07, 2019, 09:35:13 PM
You havn't asked me if I know anyone who has them.
Hearsay isn't admitted. :-)
Title: Re: K100LT Fresh Air Vents
Post by: daveson on October 07, 2019, 09:37:44 PM
I thought you were going to say "is it worth it"
Title: Re: K100LT Fresh Air Vents
Post by: Laitch on October 07, 2019, 09:39:47 PM
I thought you were going to say "is it worth it"
You need to work on your psychic powers.
Title: Re: K100LT Fresh Air Vents
Post by: daveson on October 07, 2019, 09:46:08 PM
Too right.
Title: Re: K100LT Fresh Air Vents
Post by: TommyT on October 07, 2019, 10:29:09 PM
I have a RT with them, I can't tell a difference with them open or close, the bike and rider are hot either way. I guess they look cool.
Title: Re: K100LT Fresh Air Vents
Post by: Martin on October 07, 2019, 10:53:26 PM
One of the bikes I rode with over the last three days was a K100LT and I did ask him about the vents. His answer was no discernable benefits.
Regards Martin.
Title: Re: K100LT Fresh Air Vents
Post by: cycleman on October 08, 2019, 09:36:23 AM
Thanks for that.  Good to know.  It makes sense they don't work that well as the openings/slots in the inner fairing pieces by your knees would allow both the heat from the engine bay and fresh air.  If they had of made them so there was just the fresh air, it would have worked better. My R100RT at least has proper air vents. Looks like the old was better than the new.  Why doesn't that surprise me?
Title: Re: K100LT Fresh Air Vents
Post by: alabrew on October 08, 2019, 05:53:50 PM
Look up these parts:

23    31 42 1 455 333    AIR INLET LEFT           0.05    1     $3.31
23    31 42 1 455 334    AIR INLET RIGHT   0.04    1     $3.31

These replace the rubber boots around the forks and add a "scoop" to direct more air into the RT/LT cockpit.
I thought is pretty effective on my first '85 k100rt.
I added some to my '91 k100rs 4v, but they don't seem to move much air into the cockpit.
Title: Re: K100LT Fresh Air Vents
Post by: cycleman on October 09, 2019, 09:11:27 AM
The bike already has those deflectors and the bottom of the gas tank has the reflective material. I'm thinking of doing a few other things to help cool the gas tank as well.  I couldn't believe how hot the gas tank gets on this bike. Too hot to touch. I figure that  is a big part of what makes the cockpit hot, on a hot day.  On  our fall and spring days its OK, but in the heat of summer it gets a bit toasty.
Title: Re: K100LT Fresh Air Vents
Post by: johnny on October 09, 2019, 09:47:19 AM
greetings...

number one thing you can do is remove all those rubber baffles between the fairing and engine that were designed to keep the heat under the tank...

the thing needs air flowing not dammed up for gawdssakes... let it breath... insulate the bottom of the tank.. and accept the notion that motos are hawt and uncomfortable...

fuel cooler if you gotts the gumption...

j o
Title: Re: K100LT Fresh Air Vents
Post by: cycleman on October 09, 2019, 10:04:13 AM
I've looked at some of the fuel mods and likely will go that route, including the fuel cooler. I agree, some of the rubber baffles, especially at the front of the gas tank could be removed to assist with airflow. Even a vented windshield would help get more air into the cockpit. I have seen also that a few years ago somebody came up with some body side panels that helped exit the heat behind the rider.

Several years ago I had a 2008 HD Softail that was a really hot bike to ride, especially in stop & go traffic. You could get aftermarket deflectors that mounted under the seat and kept the heat from the rear cylinder & rear exhaust from your legs, that coupled with an oil cooler made the bike rideable on hot days.

Hard to believe BMW would actually design the fairing on the bike the way they did.
Title: Re: K100LT Fresh Air Vents
Post by: johnny on October 09, 2019, 10:47:46 AM
greetings...

the least hawt things are 1 removing the baffles 2 insulating the undertank 3 insulating the underseat 4 installing a solid piece blanket steering head to rear seat cowl which includes between frame rails and side covers...

forces everything out everywhere butts between your taint and your feet...

the last one i made was mylar... made pattern with paper... cut mylar to pattern... its was the perfect johmny blanket...

i dont run them anymore cause i learnt motos are supposed to be hawt... guess what... they right...

j o
Title: Re: K100LT Fresh Air Vents
Post by: alabrew on October 09, 2019, 12:51:34 PM
I put a full johnny blanket on the '85 this year and it helps keep the tank much cooler.
Title: Re: K100LT Fresh Air Vents
Post by: daveson on October 09, 2019, 05:26:52 PM
If you havn't had your brick long,  and it was parked by the previous owner, just riding 1000miles could help.  Also flush and replace the coolant, and a good service.

Check that there are no bubbles in the coolant and that the expansion tank level rises and falls, after and before a trip. 

There should also be an infill panel to direct engine heat out the side vents,  preventing it mixing with the fresh air vent. Seems funny,  outside air vents on a motorbike.