ADVrider

Go Back   ADVrider > Bikes > Old's Cool > Airheads
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-16-2013, 08:28 PM   #1126
JonnyCash
turd polisher
 
Joined: Jan 2011
Location: Midcoast, Maine
Oddometer: 1,488
^ I kind of hate to admit it, but on my 100s engined /5, I don't have the airbox, and the breather just vents into the starter housing. It has never been an issue. When I take off the front cover, the diode board always has a film of oil, but it never gets any worse than that. That said, I'm going to put a stock airbox on there, but I need to find a set of air tubes for the 40mm carbs.
__________________
I wouldn't bring her home to Mama, but Mama ain't home tonight.
JonnyCash is offline   Reply With Quote
Old 09-17-2013, 12:21 PM   #1127
bill42
Old-School BMWs
 
bill42's Avatar
 
Joined: Dec 2011
Location: Long Island, NY
Oddometer: 362
I thought I'd post an email I just got today from Edgar who owns Flatracer.com.
He was quite familiar with the metal cover to delete the air box and he gave a nice little history of the first one up until today. Apparently a french guy made the first metal covers starting over a decade ago.
Edgar finishes up in the usual advice warning that low end torque will decrease and mileage will suffer. While I lust after this pretty metal cover, my priority first is reliability and performance and then looks afterwards, so for my current R100, I'm going to pass on this gorgeous engine cover, and keep my ugly black plastic afterthought of an air box. Hey I'll save a few hundred bucks too.

Letter from Flatracer:

Glad you did find the cover. This cowl was originally designed and made in
metal by Xavier Parent in France, from his Motorne atelier but never sold
individually. Xavier used to fit this only on his own commissioned bikes.
Xavier was a very talented artist who unfortunately got seriously ill and
was forced to shut down Motorne. He had been doing BMW Café Racer
conversions and parts (and others) way before Café Racer became the new
phenomenon and even before me (I started with the R2v series in 2006).

His design was later copied in his own country but with the cowls now made
in GRP (I got one of those early copies) which were frankly quite flimsy and
ill fitting. Others caught the drift in Belgium (I also got a copy, slightly
better built), Italy and eventually Germany. Bayer, who is associated with
Siebenrock (one of our suppliers) has access to a foundry in the former
Eastern Bloc (who do the rocker covers, which are then finished and
stainless steel bead blasted in Germany)thus it was a fairly easy thing to
do if there was a market for it.

Personally, I prefer to run replacement K&N air filters fitted in the
standard air box (my favourite is the pre-81 with extra holes for breathing)
on my bikes. The filtration is superior, the performance and economy is
enhanced and tune is fairly easy to do.

Bellmouths only tend to work well on modified engines that thrive at higher
revs. The bellmouths provide shorter inlet tracts, which can upset the
venturi effect at low engine speeds and proper fuel/air atomization, thus
contributing for poorer engine tractability at low revs, poorer fuel economy
and possibly accelerated engine wear, especially so if the carburation and
ignition are not fine-tuned, ideally on a dyno or rolling road by an
experienced operator.

Regarding the breather, you still need to keep the original breather in
place (it times the release of positive pressure inside the crankcase) but
obviously you will need to plumb its rubber pipe elsewhere. I would suggest
an alloy oil catch tank, which are available in many different sizes for
classic/tuned cars and fit it to your frame. This is a better arrangement
that just ventilating polluted air onto the atmosphere as the old Norton
Manx used to do via the single breather hose routed all the way to the back
of the rear mudguard (you did not want to spray the tyres with oil, that is
for sure).

Hope this helps.

All the best.

Edgar

www.flatracer.com
__________________
Bill C.
On The Level BMW Club magazine photo editor / Art Director
1981 BMW R100 Café build thread
1958 BMW R50 aka: A BMW Motorcycle Story (link)
bill42 is offline   Reply With Quote
Old 09-17-2013, 01:02 PM   #1128
RGregor
User Awaiting Email Confirmation
 
Joined: Oct 2007
Location: Bavaria
Oddometer: 437
Cast engine cover

Hello @all!

AFAIK Motorne offered two different engine covers: one made of glass fibre and one made of aluminium sheet. No cast version.

I had seen a glass fibre cover in 2006. It was nice but IMHO too weak. And then already nothing could be ordered from Motorne, they didn't answer emails or the phone.

So a friend and I decided to make a cover in aluminium cast.
We did that in winter 2006/2007 making two covers.

It's that cover here:
http://forum.2-ventiler.de/vbgallery...t/232.jpg.html

As you can see it's got not the same shape as the Bayer covers.

At the annual Boxerkunst (the link above is from the 2007 meeting) meeting people liked it very much and we got loads of requests to fabricate them. As we didn't want to someone in the 2-Ventiler forum started to produce them.
I always thought, Bayer had them from that source. Maybe/probably that's wrong.

The covers from Bayer fit very nicely, better than ours.

Best regards,

RG
RGregor is offline   Reply With Quote
Old 09-17-2013, 01:30 PM   #1129
Thorazine
Likes exhaust fumes
 
Thorazine's Avatar
 
Joined: Sep 2013
Location: Smoggy Valley, east of Smog City, Southern Calif.
Oddometer: 701
I don't care what people claim the hipsters have done to besmirch cafe bikes. I still love em (the bikes, not the hipsters). Too many of these bikes here are flat out humpable. Keep me away from them.
__________________
Bones aren't important; we like motorcycles.-- My boy D @ 4 y/o

* Posts submitted under the moniker Thorazine are for entertainment purposes only, and may include exaggerations, prevarications or bald-faced lies. -- Thorazine - '74 R90/6
Thorazine is offline   Reply With Quote
Old 09-18-2013, 08:25 AM   #1130
east high
Studly Adventurer
 
east high's Avatar
 
Joined: Oct 2009
Location: Portland, Oregon
Oddometer: 944
Quote:
Originally Posted by Thorazine View Post
I don't care what people claim the hipsters have done to besmirch cafe bikes. I still love em (the bikes, not the hipsters). Too many of these bikes here are flat out humpable. Keep me away from them.
This is why people moan about cafe bikes. Too many of them are being built for humpin and not riding.
__________________
'71 r75/5
east high is offline   Reply With Quote
Old 09-18-2013, 08:40 AM   #1131
RGregor
User Awaiting Email Confirmation
 
Joined: Oct 2007
Location: Bavaria
Oddometer: 437
Hi!

Quote:
Originally Posted by east high View Post
This is why people moan about cafe bikes. Too many of them are being built for humpin and not riding.
Sorry, what's "humpin"?
Didn't find any translation for that.

But I believe I got the idea.
From personal experience I can say that caffeinated bikes can look good and ride ways better than any BMW stock bike. Just depends on the priorities you set when building the bike.

Best regards

RG
RGregor is offline   Reply With Quote
Old 09-18-2013, 10:32 AM   #1132
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,804
Quote:
Originally Posted by east high View Post
This is why people moan about cafe bikes. Too many of them are being built for humpin and not riding.
Exactly. I love them when they are built to go. That should be the whole point IMO. For instance, there is a popular one right now floating around threads that has the seat cowling/subframe just inches over the rear tire's axle. I could ride that bike around the block and get the rear tire into the subframe big time. I hope it doesn't hurt anybody. That doesn't look cool to me. It looks F'ed up.
supershaft is offline   Reply With Quote
Old 09-18-2013, 10:57 AM   #1133
bill42
Old-School BMWs
 
bill42's Avatar
 
Joined: Dec 2011
Location: Long Island, NY
Oddometer: 362
Quote:
Originally Posted by supershaft View Post
Exactly. I love them when they are built to go. That should be the whole point IMO. For instance, there is a popular one right now floating around threads that has the seat cowling/subframe just inches over the rear tire's axle. I could ride that bike around the block and get the rear tire into the subframe big time. I hope it doesn't hurt anybody. That doesn't look cool to me. It looks F'ed up.
You might be surprised. I have only 3 inches between my tire and seat bottom yet after 2000 miles so far this summer while flying off the seat 50+ times the tire doesn't touch the seat bottom ever. Benefit of being 170 pounds maybe, but also my shocks are too low and stiff. this winter I will replace them with 3/4 inch higher stock height shocks that are softer.
__________________
Bill C.
On The Level BMW Club magazine photo editor / Art Director
1981 BMW R100 Café build thread
1958 BMW R50 aka: A BMW Motorcycle Story (link)
bill42 is offline   Reply With Quote
Old 09-18-2013, 11:05 AM   #1134
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,804
Quote:
Originally Posted by bill42 View Post
You might be surprised. I have only 3 inches between my tire and seat bottom yet after 2000 miles so far this summer while flying off the seat 50+ times the tire doesn't touch the seat bottom ever. Benefit of being 170 pounds maybe, but also my shocks are too low and stiff. this winter I will replace them with 3/4 inch higher stock height shocks that are softer.
Sorry but probably not.
supershaft is offline   Reply With Quote
Old 09-18-2013, 11:23 AM   #1135
bill42
Old-School BMWs
 
bill42's Avatar
 
Joined: Dec 2011
Location: Long Island, NY
Oddometer: 362
Quote:
Originally Posted by supershaft View Post
Sorry but probably not.
Well maybe you need to go on a diet!
I did take into account my weight and the fact that I will never carry a passenger when I designed my build. My shocks are way too stiff though, which was a mistake. Even my 220 pound friend doesn't bottom out the bike but he also felt the shocks were far too stiff. A project bike is never finished, they say, and I have only just begun.
__________________
Bill C.
On The Level BMW Club magazine photo editor / Art Director
1981 BMW R100 Café build thread
1958 BMW R50 aka: A BMW Motorcycle Story (link)
bill42 is offline   Reply With Quote
Old 10-11-2013, 01:24 PM   #1136
bill42
Old-School BMWs
 
bill42's Avatar
 
Joined: Dec 2011
Location: Long Island, NY
Oddometer: 362
back to Café PICTURES

just wanted to post a nice pic from my bikeEXIF.com photoshoot.
If you want to see a bunch more large pics from this shoot, I posted them all in my build thread which is in my signature.

__________________
Bill C.
On The Level BMW Club magazine photo editor / Art Director
1981 BMW R100 Café build thread
1958 BMW R50 aka: A BMW Motorcycle Story (link)
bill42 is offline   Reply With Quote
Old 10-11-2013, 06:45 PM   #1137
robtg
Studly Adventurer
 
Joined: Jun 2007
Location: san jose
Oddometer: 627
If you have 3" wheel travel before disaster and shock length allows more,
no matter the spring rate or rider weight , it is poor design. Install one damper without spring and move it through the full travel without interference and you are good. There a lot of "customs" built with looks as the main focus with little thought given to function.
robtg is offline   Reply With Quote
Old 10-11-2013, 06:47 PM   #1138
JonnyCash
turd polisher
 
Joined: Jan 2011
Location: Midcoast, Maine
Oddometer: 1,488
I would say it's bad to design it so that the wheel could touch, but I can't imagine it causing a disaster.
__________________
I wouldn't bring her home to Mama, but Mama ain't home tonight.
JonnyCash is offline   Reply With Quote
Old 10-11-2013, 07:06 PM   #1139
Airhead Wrangler
Adios Mexico
 
Airhead Wrangler's Avatar
 
Joined: Mar 2008
Location: Back in Seattle, FINALLY
Oddometer: 6,430
Quote:
Originally Posted by robtg View Post
If you have 3" wheel travel before disaster and shock length allows more,
no matter the spring rate or rider weight , it is poor design. Install one damper without spring and move it through the full travel without interference and you are good. There a lot of "customs" built with looks as the main focus with little thought given to function.
Exactly my main gripe with most cafe bikes. Cover the basics first. Then go after the trendy bling.
__________________
R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
Airhead Wrangler is offline   Reply With Quote
Old 10-11-2013, 07:21 PM   #1140
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,804
Quote:
Originally Posted by JonnyCash View Post
I would say it's bad to design it so that the wheel could touch, but I can't imagine it causing a disaster.
Sure, I couldn't imagine it causing a disaster either unless you got into that subframe big time while you were hauling ass but hauling ass is why I do stuff like that to my bikes to start with. My weekend run has a small dip that gets both my tires airborne for about five yards or so at close to 80mph. The dip is in a small esse at the same time and it always gets me landing a little crossed up. Nothing that a little head shake won't iron out but I could see that subframe causing me serious grief.

But I could see those massively lowered forks getting me into a giant tank slapper well before that if they didn't first cause me to drag a cylinder so hard that it launched me into low orbit for all that lost ground clearance. That is if the steel braided brake line doesn't rub a whole into the oil cooler first and I blow up my engine while crashing in my own oil. In reality that road hook of a ride off stand would probably launch me into ass pucker land sooner than anything. A supposedly sporty bike with a ride off stand on it? It's laughable. Sorry but I notice things like that and don't tell me stuff like that doesn't matter. It does! At least to us riders.

supershaft screwed with this post 10-11-2013 at 07:45 PM
supershaft is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 02:57 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014