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Author Topic: turbocharged cb550 bobber  (Read 33232 times)

Offline der_nanno

  • Posts: 166
  • Faster!
    • Greasy Greg
Re: turbocharged cb550 bobber
« Reply #195 on: Feb 17, 2017, 18:05:21 »
If it comes out pouring like it's going out of style, you're just about right in terms of oil-flow.  ;)
Real freedom starts with the freedom of thought.

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

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571.msg856144

Offline rusche

  • Posts: 119
Re: turbocharged cb550 bobber
« Reply #196 on: Feb 21, 2017, 01:45:05 »
How is the throttle response with the draw through setup?
Did you use any carbon seals on the turbo?
I originally planned to draw through my XS shitheap project,and decided to blow through due to hearsay about drivability improvements, although fuel pump, pressure regulator and etc are proving to be a pain in the ass
Bike sounds wicked

Offline der_nanno

  • Posts: 166
  • Faster!
    • Greasy Greg
Re: turbocharged cb550 bobber
« Reply #197 on: Feb 21, 2017, 06:53:33 »
If you don't have mad power-goals and choose a sufficiently small turbo, response won't be too bad. Even on my TR1 with the oversized T3, it responded a bit more sluggish than a n/a bike.
Real freedom starts with the freedom of thought.

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

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571.msg856144

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #198 on: Feb 21, 2017, 11:34:50 »
How is the throttle response with the draw through setup?
Did you use any carbon seals on the turbo?
I originally planned to draw through my XS shitheap project,and decided to blow through due to hearsay about drivability improvements, although fuel pump, pressure regulator and etc are proving to be a pain in the ass
Bike sounds wicked

Throttle response is not bad at all. Theres a bit of hesitation just above idle, but after that its a screamer. And no carbon seals, just the regular piston ring type.

Offline cxman

  • DTT SUPPORTER
  • *
  • Posts: 2236
Re: turbocharged cb550 bobber
« Reply #199 on: Feb 21, 2017, 12:18:32 »
dial down the boost with an adjustable waste gate and enjoy it
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #200 on: May 18, 2017, 00:17:39 »
Well after I had the bike out the first time a month or two back, I ran into some cylinder head troubles due to wrenching under the influence. After enjoying several adult beverages I decided it was a good time to re-torque the cylinder head. Long story short, I managed to misalign the tappets when reinstalling the valve cover and destroyed the valve guides and valves. Took a little time to get a freshen up a new head and get it going again, but it is running again!

I've put 87 miles on this thing now, and it is really something else to ride. The turbo loves everything between 7-12k rpm. Builds scary boost, 5-10psi fairly frequently all the way up to 14 psi a few times. Maybe my head studs, mls gasket and extra low compression ratio will keep this thing together forever. Maybe it will all grenade in another mile and I'll have to throw in an ebay engine and dial down the boost. It's way too much fun as is to tone things down right now!

Currently back up on the operation table for electric work. Battery went from good to bad in short order on a ride Sunday. Thinking I fried my reg/rec from having it mounted too close to cylinder heat, and this took out the battery. Parts on order.
« Last Edit: May 18, 2017, 09:02:42 by mswans »

Offline Brodie

  • DTT SUPPORTER
  • *
  • Posts: 2034
  • Gold Coast, Queensland
Re: turbocharged cb550 bobber
« Reply #201 on: May 18, 2017, 05:03:49 »
Looks like you ran into some gravity troubles when taking the picture.






Good to see it is running and on the road. Are you going to limit the boost to around 10psi or just let it free spool?
What is the compression ratio that your are running?
Also that is one hell of a linkage rod for the rear brake.

Offline stroker crazy

  • DTT SUPPORTER
  • *
  • Posts: 3449
  • crazy as a fox
Re: turbocharged cb550 bobber
« Reply #202 on: May 18, 2017, 06:54:22 »
Looks like you ran into some gravity troubles …

It would be the right way up if he sends it to Oz!

Crazy
“Ride like the Wind” W.H.

Offline cxman

  • DTT SUPPORTER
  • *
  • Posts: 2236
Re: turbocharged cb550 bobber
« Reply #203 on: May 18, 2017, 08:32:51 »
i thought he was draining the oil to change it
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #204 on: May 18, 2017, 09:12:59 »
Good to see it is running and on the road. Are you going to limit the boost to around 10psi or just let it free spool?
What is the compression ratio that your are running?
Also that is one hell of a linkage rod for the rear brake.

current plan is to let it be and use my wrist as the boost controller. I have not come up with a clean way to get a wastegate working on it.
I haven't calculated the compression ratio, but am pretty curious with what it is. Stock is 9:1. I have stock pistons and a head with doubled base gaskets and a .060 head gasket. Stock head gasket is supposed to be around .040 but I am unsure how thick a base gasket is. If I knew the thickness of a base gasket I would be able to measure from there.


Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #205 on: May 18, 2017, 18:19:04 »
Alright, just did my best to measure the base gasket thickness and calculate a compression ratio. I came up with a 7.6:1 compression ratio. Sounds to me like 14psi is just what this engine needs!

Offline Brodie

  • DTT SUPPORTER
  • *
  • Posts: 2034
  • Gold Coast, Queensland
Re: turbocharged cb550 bobber
« Reply #206 on: May 18, 2017, 19:14:55 »
That is not to bad for a turbo engine.

What octane ratings do you get over there?
We have 91, 95 and 98 in Aus. A few places have 105 but that is full of ethanol

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #207 on: May 18, 2017, 23:25:35 »
91 no ethanol is the best pump gas we get around here, and it's even hard to find at times. So 91 it is. I do still need to wean down the main jet a few sizes, I'm running plenty rich at the moment.

Offline spotty

  • Posts: 832
  • Vmax...why,yes i think i will
    • spottys world of vmax (and great danes)
Re: turbocharged cb550 bobber
« Reply #208 on: May 18, 2017, 23:40:56 »
That is not to bad for a turbo engine.

What octane ratings do you get over there?
We have 91, 95 and 98 in Aus. A few places have 105 but that is full of ethanol

yep, found the 105 one day and thought to myself, that's exactly what a Vmax needs....turns out it doesn't work very well on carb'd engines in general and vmaxes in particular, no power, overheating and lots of stalling. but on the plus side when you get home and drain a whole tank of it, it makes the best weedkiller I've ever found, that was two years ago and theres still nothing growing there
short fast loud, three things punk rock and vmaxs have in common

south of the border, down melbourne way

Offline der_nanno

  • Posts: 166
  • Faster!
    • Greasy Greg
Re: turbocharged cb550 bobber
« Reply #209 on: May 19, 2017, 02:58:08 »
A few places have 105 but that is full of ethanol

You lucky b*st*rds. That's just the go-juice for your turbo-powered death-wheel. (Can't get it over here - at least not within a 50 mile radius, but would make tuning the ol' Turbo TR1 soooo much easier!)
Real freedom starts with the freedom of thought.

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

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571.msg856144