Injector leaking under pressure??

maKe · Feb 27, 2013

This is odd.

Got my 570 injector back from cleaning and flow testing. New o-rings as well it seems.
The testing was done @ 3 bar pressure. Report says: dripping/seeping under pressure. Even after cleaning and o-ring change.

Flow pattern was ok before and after. Flow was 432cc/min before and after. Using a rough injector calculation found on finjector.com website it should be good for 80-95hp @ 80% duty cycle. Our bikes had a bit higher pressure than 3bar? So it might be in the 450-480cc/min range.

I still find hard to believe it leaks as I've had no problems with the bike whatsoever. Gotta call to them tomorrow and ask whats the fuss. What do you guys think? Did they mess up something or have I had faulty injector all the time?

Torque Monster · Feb 27, 2013

Don't know about your injector issue. Had mine tested new and it did not leak at all.

I can tell you that my bike on the dyno was pushing more than 90%+ duty cycle on the injector on my 663. Been told by injector guys that this may be a bit too high and I should be looking to one with more flow. Told the target should be around 80% duty cycle like you stated. I can see the duty cycle of the injector on my Vortex software so that is how I know what mine was doing. I have been told that the Suzuki RMZ450 injector should fit right into our throttle bodies and that it flow 6% more. Need to do more research. You might look into the Suzuki part if you need a new injector.

jon andersson · Feb 27, 2013

So if I understand you right that 6% more will make it possible to run it on lower duty cycle with the same result as the oem? I guess you have to tweak the fuel mapping too then?

Torque Monster · Feb 27, 2013

Yes & Yes - the Vortex ECU I use is tuneable.

Bergini · Feb 27, 2013

I have seen more than one auto injector leak pressure and cause a misfire....one had a tiny (but visible) dent on the nozzle and could be blown though with lung pressure 8O .......

usually would cuase a long crank time because fuel pressure would bleed off once you shut it off then would have to crank a long time due to building up of fuel pressure......or course this is autos

although on second thought 3 bar = 43psi and most cars depending on age would start at 43psi normal and go up to 60psi on age on a gas engine.....

reguardless bike or car engine it shouldnt leak......at all..... at 6 bar it should hold:cheers:

if i remember right on most domestic (us) autos 200/1000 rpm misifre is noticable and sets lights issues...

I have found i shouldnt drink on week nights or i might talk about cars on bike sites......ooops.... :twisted:

berglsmerg · Feb 27, 2013

My injector leaks as well maKe, I havent had a problem with the way the bike runs, it's just a real ****** to start when it's hot, the dwell time between injector pulses is hardly long enough to allow enough fuel to pass to make a difference while running. I tested mine by cycling the fuel pump and watching the injector nozzle ( takes a while but you will see a droplet form. Not buying a new unit @ $250 :angry:

maKe · Feb 28, 2013

Now that you tell, I remember when I bought the bike brand new. It was a real pita to start for the first few hours. Would sputter only for many seconds and then came to life.

After 20 hours of use it usually cranks immediately without problems and idles fine. Only few times it's shut down itself when idling.

So I should use it anyway? If it wont hurt power and runs like it should thats ok? Don't still get how it can leak with new o-rings. Is it internal leak in the body and starts to drip from the tiny holes on nozzle when pressure is in, but no current for the coils to close and open it?

maKe · Feb 28, 2013

Well got reply from finjector and they told that it was so minimal that it would only be noticeable as hard starting when motor is warmed up. If the pressure inside the system drops quickly after shut down there wouldn't be dripping and starting problems. Does not make any difference when the motor is running and thats what matters!

berglsmerg · Feb 28, 2013

Copy that, now come get on with it and bolt that motor together, can't wait to see what you get.

maKe · Feb 28, 2013

Might give a call to my tuner today and ask him whats the progress with the head and ecu. I dunno does he take it to a machine shop, but I'm probably going to take it to a local machinist guru and deck the surface and see if the seats and valves need work done too.

Torque Monster · Feb 28, 2013

berglsmerg said:
My injector leaks as well maKe, I havent had a problem with the way the bike runs, it's just a real ****** to start when it's hot, the dwell time between injector pulses is hardly long enough to allow enough fuel to pass to make a difference while running. I tested mine by cycling the fuel pump and watching the injector nozzle ( takes a while but you will see a droplet form. Not buying a new unit @ $250 :angry:

Injector pulses are in milliseconds - 1/1000 of a second(percentages of a millisecond in the case of my Vortex) that is not much time between squirts to leak.

$250 for an injector over your way, WOW - big price difference to what we pay in the states, search a little and you can find them for $140 US dollars. I knew you guys paid more but I did not think it was that much more, ouch.

berglsmerg · Feb 28, 2013

Yes dude we get *** *****. Now the Aussie dollar is as strong as its ever been and gone over parity with the greenback we still get *** *****, gold price has never been so high either, which is just dandy now that our strong dollar makes our gold so damn expensive. The upside of the strong aud is it seems like you guys are practically giving stuff away compared to time where our dollar bought 50 US cents :rant:

So yeah checked the price it is 219.90 ktm hard part. I spent literally days searching for alternatives about 18 months ago and turned up bupkiss, I decided to just ride the c**t of a thing instead, any pointers in the right direction would be appreciated though. :mrgreen:

Injector leaking under pressure??

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