posted February 12, 2002 11:25 AM
Balancing injectors Reading an Australian magazine article on 12 perfromance & maintenance, I came upon a reference to "balancing the injectors" as a maintenance item. Looking through the manual, I couldn't find anything about balancig them. Anyone know anything?
posted February 12, 2002 01:48 PM
Edited By: Y2KZX12R on 12 Feb 2002 13:48
Its somthing that has been done by the car guys for years. Basically they put the injectors on a machine that supplies a given amount of fuel pressure and fires the injectors at a given dwell time. Then the fuel is measured and the injectors are grouped. Some injectors have adjustable pintle stops but most dont. The new style of injectors has no pintle at all and uses a perforated disc as a nozzle. This style actually has multiple holes. The zx12r has 4 holes. The holes are lazer cut and its up to the manufacturer to spec the hole size and number to set flow rate. Honda has just comeout with a new injector for some of thier bikes.
These injectors are worth looking into. They have much smaller holes and more of them. the fuel pressure and injector dwell would have to be dialed in but it might be worth it. On these modern injectors the fuel is fogged out of the holes at a much much smaller droplet size than say a 5.0 mustang injector. The velocity is so low in the zx12r heads intake ports compared to a PFI 350 chevys port that the injector plays a much bigger part in fuel atomization.
Atomization is key to making more power, just as much as more air is. If an injectors dwell time aproaches coil saturation the injector goes "static" and it becomes less efficient. You can raise fuel pump pressure as a stop gap measure but its better to use an oversize injector and reduce the dwell time by 20%.
Bosch has some new anular injectors that might be worth some power when they become available.
Watch what the F1 guys are doing.
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posted February 12, 2002 06:32 PM
Edited By: swft on 12 Feb 2002 18:34
When you tweak your map on your PC IIIr, that's exactly what you are doing, adjusting the 'on' time. Unfortunately, you are tweaking it for all four of them...So once again, the only answer is:
posted February 13, 2002 11:58 AM
Yea, what Swft said. Mechanically the zx12r injectors are not adjustable as far as I know. The dwell time of course is with the PC-III. Injector timing is not adjustable with the PC-III.
I think Ted G. stated quite some time ago that Dynojet had some injector timing offset built into the PC-III. I dont know if this intentional or just a byproduct of taking over the injector control.
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posted February 13, 2002 03:56 PM
Edited By: ROCKET J on 13 Feb 2002 15:57
I'm sooooo confused Is it the equinox, or the solstice when you can balance your injectors?
Rocket
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posted February 14, 2002 04:22 AM
Edited By: Y2KZX12R on 14 Feb 2002 04:25
It sounded like his question was about injector fuel flow balance. Syncronization of the throttle body butterflies is another issue.
I didnt see the article in that mag so I dont know what it was refering to.
____________
Y2KZX12R
CompetitionCNC.com
posted February 14, 2002 07:14 AM
The following are excerpts from the article, which appeared in the June issue of Australian Motorcycle News:
"But being a 12000km service, this was the full biscuit, including valve clearance adjustment, balancing of the fuel injectors and cleaning the airfilters.....Also balancing the injector system, which operates mechanically, will make a difference as over time the injectors can get out of synch, reducing the efficiency and therefore power....
I'm inclined to think that Kone has this one right, as they presented a service list in the article, and nowhere was "Synchronizing throttle bodies" mentioned. I interpreted "balancing the injectors" the same way Y2K did -that the injectors were somehow being flow-matched, but apparently that's not the case.
It looks like they are refering to the syncronization of the throttle blades and/or the air bypass screws that are "non serviceable" but can actually be adjusted after the plugs are removed.
Them calling it "balancing the injectors" is not the right terminology. I bet alot of people were confused about that one.
____________
Y2KZX12R
CompetitionCNC.com
posted February 14, 2002 11:11 AM
Injectors Im glad this subject came up. I was thinking about starting a similar thread. I read in some of the MC magazines about the honda RC51/954RR (former 929) now has special lazer cut 12 hole injectors, for improved fuel atomization. I would imagine the 12R would benefit from upgrading to these? Particularly the higher compression 1270 bikes? Id love to see if one of you boys with the deep pockets would do a before/after same day dyno test. Maybe Muzzy? It might require reprogramming of the PCIIIr also, but I'd bet it would be worth a few horses... and maybe improve driveability/reduce flat spots in the curve? It's a pretty damn smooth power curve... but there is always room for improvement.
posted February 18, 2002 03:20 AM
Russ Colins has some good info on balancing injectors...if you've never heard of him...he ummm...LIKES BIKES!!!
Old drag race geezers like me...KNOW of him and his past history in Bike racing... http://www.rceng.com/index.htm
Wish we had the money to try NEW balanced injectors set-up by him or at least test/balance a stock set...
posted February 18, 2002 03:29 AM
Ive used Marren Motorsports in CT. for getting injectors cleaned and calibrated. Gives you a nice print out and each injector is marked. Service usually runs about $23 per injector! ____________
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posted February 18, 2002 11:15 AM
RC Engineering Ive used RC engineering on my 810 Gpz turbo with great results. Im pretty sure the stock injectors on the 12R are quite good, and it will be a few years before they are old/dirty enought to justify sending them to RC engineering. I was just wondering what the new RC51/954RR injectors would be like in the 12R. If youve got say 20K or more miles on your 12R... it's probably time to get the injectors cleaned. Just MHO
posted February 18, 2002 02:32 PM
Honda injectors Yea, the Honda injectors are worth trying for shure. Not that they flow more, but the atomization must be good for them to jump throttle bores like they did this year on the RC-51.
Of course the fuel pressure and A/F ratios would have to be set up and that would take some quality dyno time.
Has anyone seen the mounting of the injectors on the 02 RC-51 yet? I'm wondering if they are center pod mounted?
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posted February 12, 2002 11:25 AM
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posted February 14, 2002 11:11 AM
