October 14th, 2017, 09:13 PM | #41 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
|
Nope, it's a 3-cyl 750 2-stroke. 250 per cylinder qualifies for ninjette status?
|
|
October 14th, 2017, 09:16 PM | #42 | |
ninjette.org certified postwhore
Name: Bill
Location: Port Huron, Michigan
Join Date: Mar 2017 Motorcycle(s): 2007 Kawasaki 250 Ninja, 1982 Honda Ascot FT500 Posts: A lot.
|
Quote:
That gas tank on the Jac Ryan photo looks a-lot like a 73' 500 tank. Bill
__________________________________________________
Insanity: doing the same thing over and over again expecting different results each time. |
|
|
October 14th, 2017, 09:21 PM | #43 | |
ninjette.org certified postwhore
Name: Bill
Location: Port Huron, Michigan
Join Date: Mar 2017 Motorcycle(s): 2007 Kawasaki 250 Ninja, 1982 Honda Ascot FT500 Posts: A lot.
|
Quote:
Bill
__________________________________________________
Insanity: doing the same thing over and over again expecting different results each time. |
|
|
October 14th, 2017, 09:30 PM | #44 | |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
|
Quote:
Ramjet, yes, the Jennings and Bell books are old staples of tuning. Correction: I don't have any S1 cylinders here, but I thought they were externally the same as S2 cylinders. They're not, S1 cylinders have six fins, and other photos of that triple, like the one on the right below, on http://notyouraveragebikes.com/ clearly show six fins, so that's definitely a 250 triple. I guess that might qualify it as a Ninjette, but it was rated only 28 hp at the crank, so somewhat less power than our 4-stroke 250s. At about $7,300 US, I doubt if it will sell very soon: http://notyouraveragebikes.com/our-b...h250caferacer/ Last futzed with by Triple Jim; October 15th, 2017 at 07:11 AM. |
|
|
October 27th, 2017, 04:49 AM | #45 |
"a legend in my own mind"
Name: maverick9611
Location: Augusta,Georgia
Join Date: May 2017 Motorcycle(s): 2015 moto guzzi norge,2020 aprilia dorsoduro, 2014 yamaha fjr, 85 yamaha fj 1100 Posts: A lot.
MOTM - Feb '18
|
ok guys, here is the end result. if anybody wants all the details let me know. thanx member jacryann for the help. long stacks is what i wanted but you loser your taper. here is the final price quote from steel dragon
Hi Michael, Price for a set of (2) aluminum stacks, 2.5" long, machine finish, is $60.00 + $25.00 programming fee = $85.00. Shipping is additional; if you're in the US, it would be between $6.65 and $8.35, USPS Priority Mail. Polished finish would be an additional $2.50/stack. Just let us know if you're good with everything- if so, we would need your shipping address and which finish you would prefer. For payment, we send a PayPal invoice to your email.
__________________________________________________
"trying not to get old" |
|
October 27th, 2017, 07:59 AM | #46 |
ninjette.org certified postwhore
Name: Eric
Location: Iowa City
Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot.
Blog Entries: 54
MOTM - Sep '18, Feb '16
|
I users the stacks for a long time. They look cool but don’t really help topend power. I got the best power from just using nothing. But that was on the dyno. I am not sure but I think the right side will go lean with stacks or open carbs when traveling at speed. I use pods on the street to keep dirt out. But for the track I take them off.
__________________________________________________
Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
|
October 27th, 2017, 08:05 AM | #47 | |
"a legend in my own mind"
Name: maverick9611
Location: Augusta,Georgia
Join Date: May 2017 Motorcycle(s): 2015 moto guzzi norge,2020 aprilia dorsoduro, 2014 yamaha fjr, 85 yamaha fj 1100 Posts: A lot.
MOTM - Feb '18
|
Quote:
__________________________________________________
"trying not to get old" |
|
|
October 27th, 2017, 10:47 AM | #48 |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
|
That's gonna kill the flow...
|
|
October 27th, 2017, 06:24 PM | #49 |
ninjette.org certified postwhore
Name: Eric
Location: Iowa City
Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot.
Blog Entries: 54
MOTM - Sep '18, Feb '16
|
It might actually cause the airflow to straighten out. Less volume but better flow caricteistics. It would be fun to see a color computer program of pressure with different screen size.
I love the look of the stacks and have used them. But don’t have any real information or knowledge that can add to the conversation. What I have read is the original intention of a big long funnel comes from dragsters. Now I could be and probably am wrong but what I read was the high over lap camshafts caused pressure to go the wrong way and fuel was splashing back out of the intake track. The long tubes coughs the fuel droplets and when the throttle was whacked open all the fuel that was splashing out of the intak went into the engine. Call the myth busters
__________________________________________________
Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
|
October 27th, 2017, 06:57 PM | #50 | |
ninjette.org certified postwhore
Name: Bill
Location: Port Huron, Michigan
Join Date: Mar 2017 Motorcycle(s): 2007 Kawasaki 250 Ninja, 1982 Honda Ascot FT500 Posts: A lot.
|
Quote:
Bill
__________________________________________________
Insanity: doing the same thing over and over again expecting different results each time. |
|
|
October 27th, 2017, 07:20 PM | #51 |
ninjette.org certified postwhore
Name: Eric
Location: Iowa City
Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot.
Blog Entries: 54
MOTM - Sep '18, Feb '16
|
Yup, Is that an old Hilborn system?
__________________________________________________
Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
|
October 27th, 2017, 07:30 PM | #52 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
|
With two different lengths to make up for the two different intake runner lengths of a big block Chevy. (although this set looks a little on the overly different side)
|
|
October 27th, 2017, 08:19 PM | #53 |
ninjette.org certified postwhore
Name: Bill
Location: Port Huron, Michigan
Join Date: Mar 2017 Motorcycle(s): 2007 Kawasaki 250 Ninja, 1982 Honda Ascot FT500 Posts: A lot.
|
Most likely. It's just a photo I pulled searching "fuel injected small block Chevy photos". Many "roundy round" oval track cars ran very long velocity stacks for probably a good reason. Formula 1 cars have/had an affinity for velocity stacks also. According to Gordon Jennings "Two Stroke Tuner's Handbook" the long velocity stacks tend to eliminate secondary intake tract resonances that upset proper fuel metering. Short velocity stacks may look cool but may in fact interfere with proper fuel metering. Bottom line is you are hard pressed to beat the O.E.M airbox/air filter set-up.
Bill
__________________________________________________
Insanity: doing the same thing over and over again expecting different results each time. |
|
October 27th, 2017, 08:49 PM | #54 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
|
Right Bill. Tony Nicosia told me that for the H1 and H2, you can't beat the stock airbox setup if you're using anything close to the stock carb size.
|
|
October 28th, 2017, 01:08 AM | #55 |
ninjette.org guru
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016 Motorcycle(s): ZZR250, VFR800 Posts: 491
|
Every engine has an ideal stack length for maximum torque=power at X rpm. Shorter stacks move power up the rpm range & longer ones move it down. You need to tune the intake pulse for your required use. This can be done with intake length & exhaust primary length.
The Ninja 300 & Versys-X 300, share the same engine, but the versys makes more torque lower in the rpm range & overall but loses out on max hp to the ninja. All achieved with intake & exhaust header lengths. For maximum power you need an airbox & velocity stacks, plus ramair if you can get it. My 800 gained 5hp with no other mods other than moving the same filter to the top of the airbox, rather than sandwiched in the middle, so the volume never changed, but the still air area above the v-stacks doubled !!! 5hp from just moving the filter location ! You need as big an airbox as possible after the filter. Minimum size should be 10x the engine capacity, there do not appear to be any gains past 20x which is usually very hard to package on a bike. So a 250cc would need 2.5L minimum & 5L maximum. Obviously the larger the engine the harder it is to package the larger airbox. YMMV |
|
October 28th, 2017, 02:03 AM | #56 | |
ninjette.org certified postwhore
Name: Bill
Location: Port Huron, Michigan
Join Date: Mar 2017 Motorcycle(s): 2007 Kawasaki 250 Ninja, 1982 Honda Ascot FT500 Posts: A lot.
|
Quote:
Bill
__________________________________________________
Insanity: doing the same thing over and over again expecting different results each time. |
|
|
October 28th, 2017, 04:55 AM | #57 |
ninjette.org certified postwhore
Name: Eric
Location: Iowa City
Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot.
Blog Entries: 54
MOTM - Sep '18, Feb '16
|
I have been modifying the 250 engine for almost ten years. I think the stock airbox has a lot of merrit. If it could be improved and I have not tested it but the metal flame guard and snorkel removed is about it.
__________________________________________________
Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[motorcycle.com] - Variable Intake Velocity | Ninjette Newsbot | Motorcycling News | 0 | March 13th, 2017 03:50 PM |
Velocity Stacks in airbox/stock filter | Ducati999 | General Motorcycling Discussion | 7 | September 4th, 2014 02:49 PM |
Velocity | CC Cowboy | General Motorcycling Discussion | 21 | June 3rd, 2014 08:03 PM |
[superbikeplanet.com] - More IOMTT On Velocity/Discovery | Ninjette Newsbot | Motorcycling News | 0 | March 19th, 2014 01:20 PM |
[topix.net] - Honda Stacks the Deck for Motocross of Nations, but Dungey Still Rides | Ninjette Newsbot | Motorcycling News | 0 | September 22nd, 2010 12:40 PM |
|
|