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Author Topic: Project: Reverse Polarity Twin Turbo (NH750tt)  (Read 699 times)

Offline Kunipshun Fit

  • Posts: 46
  • Big Dreams. Small Funds!
Project: Reverse Polarity Twin Turbo (NH750tt)
« on: May 09, 2019, 10:15:51 »
I guess its time I finally introduce my project here. I've been lurking around for over a year.

Bike: 1993 Honda Nighthawk 750 with a 1998 engine(no clue why)

The Plan:  A radically customized homologation of a retro modern cafe racer/brat/thing... IDK what to call it. Hence the name.  I intend to borrow the rear suspension from a Harley Davidson (dont oust me yet) softail and locate the shocks under the belly of the bike.  Doing so will free up the room I need to do an underseat install of two tiny turbos (I've done the calculations).  It will be intercooled, and for now run with converted CV carbs, but possibly EFI at some point in the future.  It will not be a fast build, but the end goal is a production quality bike.  100hp at the wheel. And, completion of my most ambitious mechanical project to date (not my first).

I picked up the bike for $500 from my wifes boss, it had been sitting for 3 years.  Hooked up some power to the battery, turned it over for a few second, and she fired to life.  Only on 2 cylinders though, and then 3 but never 4.  It had pod filters that I could pull off by hand, all the plastics were broken, cracked, and barely hanging on with zip ties.  The grips didnt fit, the handle bars were too small for the clutch and brake bracket so they were loose, the headlight was falling off, wires were cut, it was a basket case. 

So I removed everything that was damaged, broken, or useless and was left with what you see below.  It took me a year to come up with a solid plan and do 99% of the research to get started, but now we are there! 

The turbos chosen, after hours of calculations, are the Ecotrons VZ21's.  They're knock off IHI RHB31s.  I'd prefer to use the IHI turbos, but I cant find even one much less two!  At some point in the future they may get swapped out with some high quality Garrett GT12's, but that's way off.

The sketches below show the plan a bit, everything circled in yellow is gonna go away to make room for the rest of the plan.  The blue will be added to the swing arm, and the green is the shocks.

The final plan has been slightly sketched out in the last pic. Also, I know this isn't everyone's cup o tea.

Details:
Brat style seat for 2 up with removable fake "hump" for solo
Frame, engine, center of wheels, calipers, and other bits powder coated anthracite grey
Tins painted Ford Ruby Red
Clip on bars with all wires hidden with bar end blinkers
Headlight/gauge cluster with two projector LED headlights
3" extended swing arm with fender added to swing arm


 
« Last Edit: May 14, 2019, 22:31:57 by Kunipshun Fit »
Lurker and dreamer.  Maybe one day Ill start on my bike.

Offline canyoncarver

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Re: Project: Reverse Polarity Twin Turbo
« Reply #1 on: May 09, 2019, 15:12:35 »
Wild.  Twin turbos eh?   I'm in.

Online JustinLonghorn

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Re: Project: Reverse Polarity Twin Turbo
« Reply #2 on: May 09, 2019, 15:13:24 »
Yep, I'm on board.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline Kunipshun Fit

  • Posts: 46
  • Big Dreams. Small Funds!
Re: Project: Reverse Polarity Twin Turbo
« Reply #3 on: May 09, 2019, 15:52:50 »
Yep, I'm on board.
Wild.  Twin turbos eh?   I'm in.

Peaked your interest did I?  lol  Until this morning I had never seen a twin setup on these bikes, but I accidently found one this morning.  However, it used older tech, and didnt really appeal to the eye like I hope mine will.  Tuck in, cause its gonna be a long ride. (Im also renovating a house at the same time. lol) :o 8)

Oh did I mention a stretched swing arm.  Dont think I did... Im doing that too.
« Last Edit: May 09, 2019, 15:55:37 by Kunipshun Fit »
Lurker and dreamer.  Maybe one day Ill start on my bike.

Offline Sav0r

  • Posts: 683
    • ChrisLivengood.net
Re: Project: Reverse Polarity Twin Turbo
« Reply #4 on: May 09, 2019, 16:00:24 »
Here's what you do. Sell the house, start building the bike.

Man I made this easy for you.
Sav0r the adventure.

Visit www.chrislivengood.net to get more information on my RD350 dubbed Mia Wallace as well as my other projects and snafus.

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Online jordandogtown

  • Posts: 173
  • Washed up Weekend Warrior
Re: Project: Reverse Polarity Twin Turbo
« Reply #5 on: May 09, 2019, 16:17:19 »
I'm absolutely in on this one.
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

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1979 CB750F Part Out

Offline Kunipshun Fit

  • Posts: 46
  • Big Dreams. Small Funds!
Re: Project: Reverse Polarity Twin Turbo
« Reply #6 on: May 09, 2019, 17:42:18 »
Here's what you do. Sell the house, start building the bike.

Man I made this easy for you.

Already did!  Thats how I ended up in this predicament!!! hahaha :P

I'm absolutely in on this one.

Happy to have ya taggin along!
Lurker and dreamer.  Maybe one day Ill start on my bike.

Offline Kunipshun Fit

  • Posts: 46
  • Big Dreams. Small Funds!
Re: Project: Reverse Polarity Twin Turbo
« Reply #7 on: May 14, 2019, 22:27:56 »
Had a bit of time to do some work today. I'll keep the words short and let the pics talk, We all like pics right?!!  :o

I needed to remove the center stand mount, but wanted to keep the frame rigidity intact, so I welded in a brace in front and tucked close to the engine to give plenty of access to the swingarm.  The brace is 1" x 1" x 0.125" tubing so its plenty strong.  Glad I didnt try it with 0.65, weak sauce.  Then I stood there for an hour staring at the shocks and building the swingarm in my head, and making choo choo turbo noises. lol

Lurker and dreamer.  Maybe one day Ill start on my bike.

Offline spotty

  • Posts: 980
  • Vmax...why,yes i think i will
    • spottys world of vmax (and great danes)
Re: Project: Reverse Polarity Twin Turbo (NH750tt)
« Reply #8 on: May 15, 2019, 03:17:28 »
this looks both very silly and very exciting, keep it up
short fast loud, three things punk rock and vmaxs have in common

south of the border, down melbourne way

Offline Bevelheadmhr

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Re: Project: Reverse Polarity Twin Turbo (NH750tt)
« Reply #9 on: May 15, 2019, 04:57:50 »
Good luck with the project. What was the logic for using a Harley Softail rear suspension setup, to give room for the Turbos?  Softail rear suspension isnt exactly known for performance, having limited movement. On a Harley the two shocks are tucked up inside the frame beneath the gearbox, but in your case the shocks will have to be positioned pretty low, will you have an problem with ground clearance?

Here's an alloy swing arm I made for my own Softail, its half the weight of the original..