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Author Topic: turbocharged cb550 bobber  (Read 41392 times)

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #110 on: Jan 19, 2016, 12:36:38 »
I just want to see it work, I mean shit who don't like a whining snail?
haha exactly what I'm thinking! The carb in the pic you posted was a tiny 30mm or so roundslide. It was just something I had laying around at the time and stuck on there to get an idea.

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #111 on: Jan 19, 2016, 12:39:03 »
I don't particulary like the intake setup so far.

Are you thinking I should have gone with more of a log style intake manifold, or do you have doubts about the whole draw through boost setup in general? Constructive criticism is always good lol

Offline cxman

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Re: turbocharged cb550 bobber
« Reply #112 on: Jan 19, 2016, 12:41:43 »
draw thru can work the only question being the seal in the turbo is it rated for fuel

there are a lot of options to get this working we need to talk

here is a 44 and a 34


1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline der_nanno

  • Posts: 358
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Re: turbocharged cb550 bobber
« Reply #113 on: Jan 19, 2016, 13:17:46 »
I am with CXMan, either get a TM42 (good aftermarket support for turbo applications - contact Dave Dunlop (FBM) in the UK) or go for the VM44. With the VM44 being the substantially cheaper option, bearing in mind, that they're only 135 USD new.

http://www.nichecycle.com/ncs/mikuni/carburetors/vm44-3-mikuni-vm44-roundslide-carburetor-by-mikuni.html
(Not affiliated with them in any way, but this was literally the first one that came up on google and I've dealt with them before...)

Cheers,
Greg
Real freedom starts with the freedom of thought.

My Blog:
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Offline cxman

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Re: turbocharged cb550 bobber
« Reply #114 on: Jan 19, 2016, 15:56:27 »
vm44 wont be the best or the most fun even a 42 off idle will be a pain if you crack the throttle

it will be like opening a sewer cover off idle so unless you stage to build boost at every light  then launch

like you stole it the bike will fall on its nose

it will however scream like a banshee once it gets on the cam and to boost

but we can do better

differential size progressive dual carbs anyone?  hmm a vm32 and a vm36 is just about right

only the vm32 would carry a pilot then.......
« Last Edit: Jan 19, 2016, 15:59:33 by cxman »
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline Sonreir

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Re: turbocharged cb550 bobber
« Reply #115 on: Jan 19, 2016, 16:00:43 »
Just sayin... ;D
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Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: turbocharged cb550 bobber
« Reply #116 on: Jan 19, 2016, 16:00:59 »
Definitely agree a vm44 is too damn big and even at the top because when you shift it is going to lose boost fast

I'm now leaning towards a round slide for my vote though
« Last Edit: Jan 19, 2016, 16:02:58 by DohcBikes »
burning bridges sometimes light the most productive paths

Offline der_nanno

  • Posts: 358
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    • Greasy Greg
Re: turbocharged cb550 bobber
« Reply #117 on: Jan 20, 2016, 17:34:55 »
Errrrr guys, you did see the little whizzy-bang-choo-choo device in the middle? Judging by the pictures this a GT17 at the very most, so it is basically a case of instant boost and a draw-through setup will never respond nicely to half throttle or anything but closed or wide open throttle. Which is why car makers switched over to blow through... Even at idle you will at the very least have enough pressure difference to atomize the fuel nicely.

Cheers,
Greg
Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline cxman

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Re: turbocharged cb550 bobber
« Reply #118 on: Jan 20, 2016, 17:41:20 »
greg

it wont be that slamming its only a 550 cc motor it is going to have some throttle just to spool 

1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #119 on: Jan 22, 2016, 09:07:22 »
After some talking with cxman, I have decided to switch gears on this project. Frame needs welding finished in various places, and also there is a twist to the neck that makes the front tire favor one side by about 2 inches. Bike is now stripped down and getting welded to a welding table so I can true up the neck. Then the engine will be coming out, and the frame work can be finished and painted. Ill do a compression test on the engine, and then I'm ready for final assembly.