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Show your crash bars…
Posted: Sun Nov 16, 2008 8:31 am
by schrader7032
Duane has some pictures of engine guards on his website:
http://w6rec.com/duane/bmw/crashbars/index.htm
Here's a picture of a safety bar that's similar to what's on my R69S:
http://www.realoem.com/bmw/showparts.do ... g=46&fg=70
It has u-bolts in four locations where it crosses the frame. The outside diameter of mine is about 24mm.
Kurt in S.A.
Re: Show your crash bars…
Posted: Tue Nov 18, 2008 10:59 am
by Allan.Atherton
I am interested in building and installing those ugly bars (to protect the cylinders) on my R51/3. I will appreciate pictures and technical details such as diameter, so I can get the idea of how to build them and how to put them on the bike...
If your bike has a front frame similar to 1955-on /2, crash bars should be available new or used, with no need to build them.
The crash bars protect the valve covers, not the cylinders. Cylinders can be torn off, but the impact required to do this is far beyond the capability of a crash bar to prevent.
The valve covers can be scratched by a tipover on a hard surface, or ground down if the bike low-sides and slides on pavement. Crash bars will be the first to contact the ground, but as Duane's page notes, there is a danger that the sliding crash bar will catch on the ground and flip the bike, where the bare valve cover would slide smoothly . And the crash bar does not protect the rider.
Another problem with crash bars is their economics. Except in a tipover, the crash bar is ground down, if not bent, in a slide and so must be replaced. A crash bar costs more, and can be more difficult find, than a valve cover. That was the case with my /2's and is may be true for your R51/3.
I ordered a crash bar for my first R27 in 1966, but after that, I never used them again.
Show your crash bars…
Posted: Tue Nov 18, 2008 12:06 pm
by Micha
Thank you Allan. That is good advice. I never thought about it that way.
I dropped the bars idea.
Cheers, Michael.
Show your crash bars…
Posted: Mon Feb 15, 2010 2:52 pm
by VBMWMO
I am interested in building and installing those ugly bars (to protect the cylinders) on my R51/3. I will appreciate pictures and technical details such as diameter, so I can get the idea of how to build them and how to put them on the bike.
Thank you all in advance.
Micha.