Haybusa Parts and Service Member Support

Author Topic: 250hp for a Gen I Build, Which Way to Go?  (Read 1225 times)

Offline krex

  • Rider
  • ***
  • Posts: 61
250hp for a Gen I Build, Which Way to Go?
« on: December 11, 2017, 09:47:47 PM »
I'd like to hear some ideas on building a 250hp na motor. I'm not sure whether to go 1507 or 1600ccs. Same price just not sure of the drawbacks of the longer stroke. I'm thinking a good stock valve(I think?) ported head, 84mm,  big cams(not sure how big to go), billet rods, studs. Not sure about compression ratio but will run whatever gas is necessary. Sound like I'm in the ball park? What else? This is for a run what ya brung drag bike.
« Last Edit: December 11, 2017, 10:08:14 PM by krex »

Offline Stainless1

  • Rider
  • ***
  • Posts: 376
  • Gender: Male
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #1 on: December 11, 2017, 10:41:21 PM »
Contact Steve Knecum
Bonneville 200 MPH Club
245 MPH Turbo Busa Powered Lakester
208.959 MPH NA GSXR 1000

Offline RansomT

  • Post Master
  • *****
  • Posts: 1158
  • Gender: Male
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #2 on: December 12, 2017, 08:58:36 AM »
To get to 250 HP, a 1507 isn't going to get there.  If it was me, I would build a 1635 (10mm stroke). 
Fastest 1.5-Mile Pass - 252.222
Fastest 1-Mile Pass - 244.2997
Half Mile - 211.47
Fastest Nitrous Bike
Production Bike
211.079 LTA. P/P 1350

Offline speedduck

  • Post Whore
  • ****
  • Posts: 678
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #3 on: December 13, 2017, 08:34:35 AM »
I dont know what size is the best for that kind of dragbike, but for the power, go big, 1600+ and .425" or .445" cams,
I am really interested to see how it turns out, using stock size valves, and what fuel , keep us posted.
 

Offline knecum

  • Mad Post Whore
  • ******
  • Posts: 2081
  • Gender: Male
  • The Recipe!
    • www.knecumpower.com
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #4 on: December 17, 2017, 11:46:39 AM »
You can reach 250 no problem with a 5 or 6 1/4 stroker and up to 285 with 9-10 mill x 84 mm bores, stock valve heads.  Contact me if you  need assistance.

Online Ali123

  • Rider
  • ***
  • Posts: 82
  • Enthusiast
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #5 on: May 12, 2018, 05:18:44 PM »
lol... guy must have thought he could do this for 4 grand or so...... lotta dreams out there

Offline 6 inch over

  • Rider
  • ***
  • Posts: 57
  • Gender: Male
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #6 on: May 14, 2018, 12:27:11 PM »
Steve

What size cams for that 250 HP build?

Online Ali123

  • Rider
  • ***
  • Posts: 82
  • Enthusiast
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #7 on: May 15, 2018, 11:09:21 AM »
u wanna buy some cams from him... or just free information

Offline 6 inch over

  • Rider
  • ***
  • Posts: 57
  • Gender: Male
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #8 on: May 20, 2018, 09:02:11 PM »
 :whisper:

I have a Bob 1397,425-415 webs
  just asking
Wanting to change the crank and rods

Offline firemanjim

  • Authorized Tuner
  • Post Whore
  • ***
  • Posts: 833
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #9 on: June 29, 2018, 10:59:16 AM »
I had a 1507, made 260 at the wheel, but it was a Forstall/ Knecum bike---sweet sounding ride, went to Stainless.
Official Site Tuner
www.jtsperformance.com
Home of one of the fastest 750cc bikes in the world
239MPH faired, 209MPH naked!
Bonneville 200 Club
El Mirage 200 Club
Mojave Mile 200 Club
Mojave Magnum 200 Club
NEDRA 100 MPH Club
Gairdner 200MPH Achiever 2013
2014 1st place Mojave Mile N/A bike
2015 top speed trophy at WOS
Colorado mile 200 MPH club
2017 DLRA 200 MPH club

Offline RansomT

  • Post Master
  • *****
  • Posts: 1158
  • Gender: Male
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #10 on: June 29, 2018, 10:34:42 PM »
I had a 1507, made 260 at the wheel, but it was a Forstall/ Knecum bike---sweet sounding ride, went to Stainless.


Not doubting....but I've never seen a 1507 make north of 250 on my dyno.  But my LSR 1340 does make 240 (so it should be possible).  Truthfully, I've had a hard time keeping that 1340 together.  Compression high as heck and top end clearances crazy tight.
Fastest 1.5-Mile Pass - 252.222
Fastest 1-Mile Pass - 244.2997
Half Mile - 211.47
Fastest Nitrous Bike
Production Bike
211.079 LTA. P/P 1350

Offline Stainless1

  • Rider
  • ***
  • Posts: 376
  • Gender: Male
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #11 on: June 29, 2018, 11:48:30 PM »
I had a 1507, made 260 at the wheel, but it was a Forstall/ Knecum bike---sweet sounding ride, went to Stainless.

Jim, that one is a 1630... "Steve 1" stroker must have 24v to spin.
Bonneville 200 MPH Club
245 MPH Turbo Busa Powered Lakester
208.959 MPH NA GSXR 1000

Offline firemanjim

  • Authorized Tuner
  • Post Whore
  • ***
  • Posts: 833
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #12 on: June 30, 2018, 03:06:11 PM »
OOPS, my bad, and both batteries better be topped off as it would spin over but not fire---
Official Site Tuner
www.jtsperformance.com
Home of one of the fastest 750cc bikes in the world
239MPH faired, 209MPH naked!
Bonneville 200 Club
El Mirage 200 Club
Mojave Mile 200 Club
Mojave Magnum 200 Club
NEDRA 100 MPH Club
Gairdner 200MPH Achiever 2013
2014 1st place Mojave Mile N/A bike
2015 top speed trophy at WOS
Colorado mile 200 MPH club
2017 DLRA 200 MPH club

Online Ali123

  • Rider
  • ***
  • Posts: 82
  • Enthusiast
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #13 on: June 30, 2018, 04:59:20 PM »
for what its worth.. I had starting issues with a big turbo bike... I went through 3 batteries... finally found a 720cca 12.3aH lithium battery for a hayabusa…. make by full spectrum... it works GREAT... and if it gets low.. the battery simply shuts down... NO POWER can be produced.. and u hit a button on the battery and it saves enough energy to start the bike.. amazing... and I HATE lithium batteries.. but this battery works GREAT.

Online Nosgsx1300

  • Mad Post Whore
  • ******
  • Posts: 2404
  • Gender: Male
  • RCC GT4088R WHOOOT
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #14 on: July 05, 2018, 03:51:32 AM »
OOPS, my bad, and both batteries better be topped off as it would spin over but not fire---

Voltmeter on the coils WHILE CRANKING
I even had the only 24v 9-1 turbo bike and still hard starting
I ended up running a 12v switched to feed the coils and now she fires immediately
RCC GT4088R
2011 Loring 204.88mph "naked"
2015 Loring 220.01743 MPH Faired in fifth gear

Offline Thomas

  • Rider
  • ***
  • Posts: 127
  • Gender: Male
  • Enthusiast
Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #15 on: July 06, 2018, 08:58:16 PM »
OOPS, my bad, and both batteries better be topped off as it would spin over but not fire---

Voltmeter on the coils WHILE CRANKING
I even had the only 24v 9-1 turbo bike and still hard starting
I ended up running a 12v switched to feed the coils and now she fires immediately
FWIW I vouch for this advice, I checked that with a scope.
http://www.suzukihayabusa.org/forum/index.php?topic=166279.msg1595188#msg1595188
I ended up with:
1. Dedicated relay located close to the battery to feed both coils and fuel pump (that is, it's a relay with two normally open contact pairs, of a 350z, was controlling cooling fans, one contact pair + fuse for fuel pump, one conctact pair + fuse for IG coils; fuel pump has dedicated ground wire, OEM ground wrie isn't used).
2. Beefing up starter motor positive and negative leads. I think I run 2 GA for negative/ground lead, and two 4 GA in parallel for + lead. "Superflex" wires make routing super easy.

I beefed up starter motor leads because I found there was quite high voltage drop, don't remember the exact value though. OEM wires are ca. 15-16mm2 or ~ 5 GA.
We guarantee fast service no matter how long it takes.