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Author Topic: Bonneville Turbo CB500/550  (Read 86882 times)

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Offline Stev-o

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Re: Turbo CB500/550
« Reply #150 on: July 18, 2012, 08:24:14 PM »
My job gets in the way of real work on the bikes too.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Gurp

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Re: Turbo CB500/550
« Reply #151 on: August 20, 2012, 09:14:07 AM »
Any new progress on this bike. Havee to say this one of the more interesting bikes on the forum. So just wondering what was up wiith it.

Thx ron
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slow Progress 74 cb550.

Poor boy chop 73 CB500 chop

Future project 77 Cb750 Amen Savior

Offline Stev-o

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Re: Turbo CB500/550
« Reply #152 on: August 20, 2012, 03:32:22 PM »
Too busy with the mother lode?!
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Greggo

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Re: Turbo CB500/550
« Reply #153 on: August 20, 2012, 04:27:30 PM »
Quote from: Stev-o on August 20, 2012, 03:32:22 PM
Too busy with the mother lode?!

Yup.  Basically, we got this bike to run, and that was enough to know I could stash it away for a while without worrying if the motor ran, or if the turbo was seized, or if I had bought myself a shiny looking turd (I didn't ;) ).  So, in the pursuit of sanity for my dad's workplace, we rolled this bike out of the way, and into the storage shed until I can take some vacation time, or get fired ;D
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Offline cabrala

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Re: Turbo CB500/550
« Reply #154 on: August 20, 2012, 07:07:51 PM »
"or get fired" ;D

I like your style Gregg.
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Offline SOHC4 Cafe Racer Fan

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Re: Turbo CB500/550
« Reply #155 on: August 21, 2012, 11:42:14 AM »
I told Carpy about your build thread.  He was excited to hear about it.
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1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
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"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Greggo

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Re: Turbo CB500/550
« Reply #156 on: August 21, 2012, 11:45:06 AM »
Quote from: CB750 Cafe Racer Fan on August 21, 2012, 11:42:14 AM
I told Carpy about your build thread.  He was excited to hear about it.

Oh, Cool!  Did you tell him we got it to run?  He told me he had never had it running when I spoke with him after the sale.
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Offline SOHC4 Cafe Racer Fan

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Re: Turbo CB500/550
« Reply #157 on: August 21, 2012, 11:52:09 AM »
Can't remember, since I mentioned it to him a couple of months ago.  I told him to check out the thread.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Greggo

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Re: Turbo CB500/550
« Reply #158 on: October 08, 2012, 06:20:33 PM »
Gentlemen, let me ponder something out loud here...Could this bike have done 175.813 mph on the salt in 1979?  If not, what other Honda in the 500cc class could have?  Steve Alexander's Honda was in class APS-BF, for Special Construction Partial Streamlining - Supercharged Fuel.  I cannot find a picture.
« Last Edit: October 08, 2012, 06:22:17 PM by Greggo »
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Offline FrankenFrankenstuff

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Re: Turbo CB500/550
« Reply #159 on: October 08, 2012, 06:34:25 PM »
HIJACK!
I just wanted to see what 175mph looked like.

Worlds fastest RB30, RIPS 240z 7.89 @ 175mph
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Offline 754

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Re: Turbo CB500/550
« Reply #160 on: October 08, 2012, 07:20:28 PM »
 In the mid 70,s a sohc 750 turbo from up here ran 150 ish on the salt.
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Offline Greggo

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Re: Turbo CB500/550
« Reply #161 on: October 08, 2012, 07:26:37 PM »
Quote from: 754 on October 08, 2012, 07:20:28 PM
In the mid 70,s a sohc 750 turbo from up here ran 150 ish on the salt.

Remember if that had any aerodynamic bodywork, or other mods?  What did it run on?
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Offline DustyRags

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Re: Turbo CB500/550
« Reply #162 on: October 08, 2012, 09:31:42 PM »
OK, joining this thread- I wanna hear all about this.
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Offline Terry in Australia

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Re: Turbo CB500/550
« Reply #163 on: October 12, 2012, 05:27:33 AM »
Quote from: Greggo on October 08, 2012, 07:26:37 PM
Quote from: 754 on October 08, 2012, 07:20:28 PM
In the mid 70,s a sohc 750 turbo from up here ran 150 ish on the salt.

What did it run on?

Salt? ;D
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Offline Greggo

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Re: Turbo CB500/550
« Reply #164 on: October 12, 2012, 05:56:12 AM »
Quote from: Terry in Australia on October 12, 2012, 05:27:33 AM
Quote from: Greggo on October 08, 2012, 07:26:37 PM
Quote from: 754 on October 08, 2012, 07:20:28 PM
In the mid 70,s a sohc 750 turbo from up here ran 150 ish on the salt.

What did it run on?

Salt? ;D

A wise guy, eh? Nyuck nyuck nyuck.  Mine runs on fairy farts.
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Offline Syscrush

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Re: Turbo CB500/550
« Reply #165 on: October 12, 2012, 06:24:56 AM »
Quote from: Greggo on October 12, 2012, 05:56:12 AM
A wise guy, eh? Nyuck nyuck nyuck.  Mine runs on fairy farts.
Hey, you're on the SOHC4 forum too, right? I go by Syscrush over there.
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Life is precious: wear your f'n helmet!
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FWIW, I'm not a shill for Race Tech - I've just got a thing for good suspension and the RTCE's are the most cost-effective mod for these old damping rod front ends.

Offline Greggo

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Re: Turbo CB500/550
« Reply #166 on: October 12, 2012, 06:30:59 AM »
I scoured the earth, and found a Yoshimura racing magneto set up. 


I'm more motivated to get it running smoothly again, as the shop may be running a 350 Benelli single, making a run for that Land Speed Record next year.  Once this turbo is running how it should, we've got access to a dyno, and that should give the best indication of whether or not this bike could have been the record breaker. 

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Offline Greggo

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Re: Turbo CB500/550
« Reply #167 on: October 12, 2012, 06:32:22 AM »
Quote from: Syscrush on October 12, 2012, 06:24:56 AM
Quote from: Greggo on October 12, 2012, 05:56:12 AM
A wise guy, eh? Nyuck nyuck nyuck.  Mine runs on fairy farts.
Hey, you're on the SOHC4 forum too, right? I go by Syscrush over there.

Syscrush, this IS the SOHC4 forum ;D
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Offline Syscrush

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Re: Turbo CB500/550
« Reply #168 on: October 12, 2012, 07:27:59 AM »
Quote from: Greggo on October 12, 2012, 06:32:22 AM
Syscrush, this IS the SOHC4 forum ;D
WOW!  I got confused. :D  I switched too fast from a thread about land speed records on another forum with similar color scheme to this one.

Plus I hadn't had my caffeine yet.  Still, this was a high water mark of stupidity for me. :)
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Life is precious: wear your f'n helmet!
There's nothing more expensive than a free bike...
FWIW, I'm not a shill for Race Tech - I've just got a thing for good suspension and the RTCE's are the most cost-effective mod for these old damping rod front ends.

Offline ivanhoew

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Re: Turbo CB500/550
« Reply #169 on: December 08, 2012, 10:06:16 AM »
h gregg ,

 i built a 400/4 turbo in 1980 , also using an ihi turbo , any thing i can help with just ask .

regards
robert
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just do it .

Offline Greggo

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Re: Turbo CB500/550
« Reply #170 on: December 08, 2012, 10:24:25 AM »
Hi Ivan,

I'd like to hear what size/type of carburetor you used.  Sounds like a fun bike!
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Offline ivanhoew

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Re: Turbo CB500/550
« Reply #171 on: December 09, 2012, 12:53:21 AM »
here is the link to it gregg,

http://forums.sohc4.net/index.php?topic=72590.0

when i first built it , i used a 1.5 inch stromberg carb , a bit like an su carb ,but with a diaphragm . it worked ok on boost ,but the piston on it was so heavy it only lifted about 1/4 inch for 5k rpm ,so v hard to get a good mix off boost .

so i then went to a mikuni i think it was off a yamaha xs 650 twin .this worked well ,the only problem ws getting enough fuel through the float bowl and into the engine .in the end , i took a pipe off the drain plug ,and ran it to a tube mounted in the air flow when the piston lifted high enough . this then bled fuel in as the airflow sucked on it .and took it from 60 to 85 bhp .


regards
robert
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just do it .

Offline Greggo

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Re: Bonneville Turbo CB500/550
« Reply #172 on: December 14, 2012, 02:32:03 PM »
That is a cool one Robert!  I have definitely heard letting them get thirsty is a recipe for detonation...

Got tired of ignoring this bike every time I go to the shop, so I pulled the throttle cable to get a replacement made.  Baby steps now...
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Offline Sam Green Racing

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Re: Turbo CB500/550
« Reply #173 on: December 17, 2012, 04:07:10 PM »
Quote from: 754 on October 08, 2012, 07:20:28 PM
In the mid 70,s a sohc 750 turbo from up here ran 150 ish on the salt.

down here, ours ran 207mph,  ;D ;D ;D ;D ;D
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Offline Greggo

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Re: Bonneville Turbo CB500/550
« Reply #174 on: December 18, 2012, 06:29:32 AM »
Quote from: 754 on October 08, 2012, 07:20:28 PM
In the mid 70,s a sohc 750 turbo from up here ran 150 ish on the salt.

I wonder what kinda gearing that took...
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