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Old 05-02-2012, 10:55 PM   #1
Donk OP
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Velocity Stacks

I am building a Cafe Racer from a 1981 BMW R100RS donor bike.
I'm situated in deepest Africa...and ask if anyone can help me find velocity stacks for 40mm Bings?
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Old 05-03-2012, 04:55 AM   #2
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Having owned two airheads, i will offer.

The stock intake system offers clean air and decent boot clearance.

I am not fond of the kewl cafe fad that is happening to old BMWs but if one wants a better airhead do three things.

Better suspension.
Best tires in the proper sizes... no over tired rims.
Frame struts to stiffen up the wet noodle frame.
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Old 05-03-2012, 05:01 AM   #3
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Quote:
Originally Posted by OldPete View Post
Having owned two airheads, i will offer.

The stock intake system offers clean air and decent boot clearance.

I am not fond of the kewl cafe fad that is happening to old BMWs but if one wants a better airhead do three things.

Better suspension.
Best tires in the proper sizes... no over tired rims.
Frame struts to stiffen up the wet noodle frame.
Did you even read the OP's post?

He wants help with velocity stacks, not suspension and frame mods.
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Old 05-03-2012, 05:07 AM   #4
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Quote:
Originally Posted by Donk View Post
I am building a Cafe Racer from a 1981 BMW R100RS donor bike.
I'm situated in deepest Africa...and ask if anyone can help me find velocity stacks for 40mm Bings?
Don't know about where you are, but here if you Google "40mm velocity stacks",
you'll get bunches, of many different lengths and various types of mounting....
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Old 05-03-2012, 05:07 AM   #5
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Originally Posted by Bugman98 View Post
Did you even read the OP's post?

He wants help with velocity stacks, not suspension and frame mods.
Yes i did.

Velocity stacks are for show not go.

EDIT: So offer something on rejetting with stacks & prolly unknown modified exhaust. lol

OldPete screwed with this post 05-03-2012 at 05:11 AM Reason: noted
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Old 05-03-2012, 05:13 AM   #6
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Originally Posted by OldPete View Post
Yes i did.

Velocity stacks are for show not go.

EDIT: So offer something on rejetting with stacks & prolly unknown modified exhaust. lol
Might wanta check this out: http://en.wikipedia.org/wiki/Velocity_stack
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Old 05-03-2012, 05:20 AM   #7
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Originally Posted by CycleDoc59 View Post
I've done my share of tuning.

The stock airhead offers a long intake runner that smooths air flow.

There is alot of cafe airhead threads in the airhead section of oldscool.
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Old 05-04-2012, 01:27 AM   #8
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Thanks for your comments Guys...what I am really asking is if anyone knows where I can purchase suitable velocity stacks. Yes I am changing an old worn-out banger and completly rebuilding it to my own specs. My thread is
http://www.wilddog.za.net/forum/index.php?topic=86209.0 where you can see what I'm up too.
I also own a 2011 BMW GSA which my wife and I tour the African countryside in style. 16000k's in 9 months.
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Old 05-04-2012, 03:22 AM   #9
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I have no idea where to get stacks for Bings. Nice work BTW.

The only bike i ran stacks on was a '77 900SS and installed Uni filters over them.

The Boxer's intake is in an area that is quite dirty, unlike a Guzzi... but they do look the bizness.

I had a R100RT and can't remember the exact year... '81 or '82.
It had an RS type engine with 40s & large valves... a touring motor it was not because it lacked mid-range.

If you're into the engine, read this thread.. http://www.advrider.com/forums/showthread.php?t=777955

Having tightened up the squish on two 948cc Guzzi engines, i can say w/o reservation that it works a treat at keeping detonation at bay.

May i suggest you post in the airhead section of oldscool forum.

Note: My older Brother spent 6 years in the RSA and remarried while there... nice lady, Molly.
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Old 05-04-2012, 07:16 AM   #10
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IIRC, bings being CV carbs aren't the hugest fan of less restrictive intakes.

Love the look though.

What sizes have you been able to source locally?
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Old 05-04-2012, 02:52 PM   #11
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In the past when I've needed stacks but none were available, I've used PVC tubing.
Heat in oven to 100*C, carefully pull out (gloves if your fingers aren't croc skin), then slide over the back of an upturned glass. Different glasses, different tapers.

To REALLY upset the BMW purists, leave them as obviously PVC..........

Have fun.
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Old 05-04-2012, 03:54 PM   #12
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Probably obvious, but try these guys. If they don't stock it, they'll make it.

http://www.velocity-of-sound.com
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Old 05-05-2012, 11:03 PM   #13
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Quote:
Originally Posted by P B G View Post
IIRC, bings being CV carbs aren't the hugest fan of less restrictive intakes.

Love the look though.

What sizes have you been able to source locally?
Problem is I cant source these anywhere in SA
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Old 05-05-2012, 11:05 PM   #14
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Quote:
Originally Posted by MODNROD View Post
In the past when I've needed stacks but none were available, I've used PVC tubing.
Heat in oven to 100*C, carefully pull out (gloves if your fingers aren't croc skin), then slide over the back of an upturned glass. Different glasses, different tapers.

To REALLY upset the BMW purists, leave them as obviously PVC..........

Have fun.
I'll give it a go ...thanks for the heads up.
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Old 05-06-2012, 12:40 PM   #15
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Originally Posted by vfxdog View Post
Probably obvious, but try these guys. If they don't stock it, they'll make it.

http://www.velocity-of-sound.com
Thanks vfxdog...I have sent them a mail...hope I get a reply!
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