Ca-Chingle Bells...

Oh what fun it is to shop Ebay... especially when you win an $2000 HRC Swingarm
for $214 delivered... Merry Christmas Mr.RC45... What under the tree for your
bike???
http://www.fox302.com/userdata/netters2/files/ShopPics/Mr.RC45HRCSwingarm.JPG


Larry L
94 RC45 #2
Have a wheelie NICE day...
Lean & Mean it in every corner of your life...
If it wasn't for us the fast lane would rust...
V4'S are music to the seat of my pants...
1952 De Havilland Chipmunk...
Yank and bank your brains loose...
http://members.ebay.com/aboutme/-xlax-/
http://home.comcast.net/~netters2/
http://www.fox302.com/index.pl?s=vg&user=netters2
http://www.reeky.org/gallery/xlax

 

Nice deal, but what's the benefit over the stock one. Lighter?
Stronger? Both?

 

There are many HRC kit swingarms however what they share in common is a
different attach point for the
pro link arm and double titanium pinch bolts... this affords the shock a more
one to one ratio for rigors of
WSB racing... I'll have to complete an engineering study... with the help of
Tony Foale's book... in order to
know what to machine for the successful mating of my current Ohlins...

The holy grail of HRC swingarms are 98 to 99 models which are gold in color
because they are cast
Magnesium which weights in at only 8.2 pounds... mine is unfortunately a 96 made
out of aluminum... so it
weights 11.8 pounds or about the same as stock... so no weight savings this
time...

I'd sheets m' drawers if I ever came across an genuine HRC magnesium swingarm...
I keep a special fund on
standby just in case...

HRC twin bolt...
http://www.fox302.com/userdata/netters2/files/ShopPics/HRCSwingarm.JPG

Stock RC45 single bolt...
http://home.comcast.net/~netters2/pics11-3-03/bigimages/RC45NL5AxleModSide.JPG

Larry L
94 RC45 #2
Have a wheelie NICE day...
Lean & Mean it in every corner of your life...
If it wasn't for us the fast lane would rust...
V4'S are music to the seat of my pants...
1952 De Havilland Chipmunk...
Yank and bank your brains loose...
http://members.ebay.com/aboutme/-xlax-/
http://home.comcast.net/~netters2/
http://www.fox302.com/index.pl?s=vg&user=netters2
http://www.reeky.org/gallery/xlax

 

There are many HRC kit swingarms however what they share in common is a
different attach point for the pro link arm and double titanium pinch bolts...
this affords the shock a more one to one ratio for rigors of racing... I'll have
to complete an engineering study... with the help of Tony Foale's book... in
order to know what to machine for the successful mating of my current Ohlins...

The holy grail of HRC swingarms are 98 to 99 models which are gold in color
because they are cast Magnesium which weights in at only 8.2 pounds... mine is
unfortunately a 96 made out of aluminum... so it weights 11.8 pounds or about
the same as stock... so no weight savings this time...

I'd sheets m' drawers if I ever came across an genuine HRC magnesium swingarm...
I keep a special fund on standby just in case..


HRC twin bolt...
http://www.fox302.com/userdata/netters2/files/ShopPics/HRCSwingarm.JPG

Stock RC45 single bolt...
http://home.comcast.net/~netters2/pics11-3-03/bigimages/RC45NL5AxleModSide.JPG


Larry L
94 RC45 #2
Have a wheelie NICE day...
Lean & Mean it in every corner of your life...
If it wasn't for us the fast lane would rust...
V4'S are music to the seat of my pants...
1952 De Havilland Chipmunk...
Yank and bank your brains loose...
http://members.ebay.com/aboutme/-xlax-/
http://home.comcast.net/~netters2/
http://www.fox302.com/index.pl?s=vg&user=netters2
http://www.reeky.org/gallery/xlax

 

I'm surprised you haven't machined your own magnesium swingarm in the
BLS yet!

 

Is it a good idea to put a hunk of magnesium so close to an engine?

Could you achieve similar weight savings with titanium?

 

There have been a number of successes producing whole engines out of
magnesium...

Titanium piece that size would be prohibitly expensive even for Honda...

Larry L
94 RC45 #2
Have a wheelie NICE day...
Lean & Mean it in every corner of your life...
If it wasn't for us the fast lane would rust...
V4'S are music to the seat of my pants...
1952 De Havilland Chipmunk...
Yank and bank your brains loose...
http://members.ebay.com/aboutme/-xlax-/
http://home.comcast.net/~netters2/
http://www.fox302.com/index.pl?s=vg&user=netters2
http://www.reeky.org/gallery/xlax

 

Strictly speaking magnesium-aluminum alloy - about 2/3 the weight of real
aluminum. (Aluminium in the UK and other parts of the Commonwealth)

I believe the titanium we see more and more of is also alloyed with aluminum
but I could be wrong.

As for machining magnesium alloys - best left to the experts

Rob

 

Hehe... most aviation turboshaft/turboprop engines have magnesium gear
boxes... so, yeah... it's no biggie...

Not practically. Ti6-4 isn't lighter than Aluminum 7075. It's 66%
heavier while being about twice as strong. It's also expensive, and MUCH
harder to work with, plus it has a terrible tendency for galvanic
corrosion and sensitivity to heat treatment.

--
Steve Keith - in reverse order of procurement:
2003 GSXR750 - Track Queen
2002 Blue Daytona - Retired from track duty after low-side
1983 GS1100ED (GS2) - eBay, rode it to PHX from San Jose via the PCH -
sweet!
1993 GSX1100F Fat Kat
1983 GS1100ED (GS1)
My wife says: "Buell rhymes with Stool"

 

The holy grail of HRC swingarms are 98 to 99 models which are gold in

Okay, not to put a damper on a great buy, but really, what does 3.6 pounds
gain you? You could get on the treadmill, and take a dump, and that will get
you 3.6 pounds.

I just don't understand the quest to shave off 3.8 oz through titanium
bolts....

 

Up side of reducing the weight of your suspension components... is that it will
allow the suspension to react quicker to the surface irregularities... the down
side is a harsher ride... and I would gladly trade comfort for control any
day...

Larry L
94 RC45 #2
Have a wheelie NICE day...
Lean & Mean it in every corner of your life...
If it wasn't for us the fast lane would rust...
V4'S are music to the seat of my pants...
1952 De Havilland Chipmunk...
Yank and bank your brains loose...
http://members.ebay.com/aboutme/-xlax-/
http://home.comcast.net/~netters2/
http://www.fox302.com/index.pl?s=vg&user=netters2
http://www.reeky.org/gallery/xlax

 

Couldn't you get the same improvement in sprung to unsprung weight
by just increasing the sprung weight of the bike and/or rider ?

I think this is the approach that Harley took.