Evening to all in the madhouse, I'm getting closer to the final stages of my engine rebuild and one thing I was a bit concerned about was if the injectors are maybe passing? When I first got the bike it had been sat in someone's shed for years and not covered much miles, the oil was a green colour and stank of petrol. I didn't think much of it at the time and just put it down to being sat. But when I serviced it and done a few hundred miles on it, had oil starvation issues and spun a big end shell I remembered about the oil being thin before and when I started stripping it down, I noticed the oil was a bit thin and it had only got a few hundred miles on it. I guess what I'm asking is does this sound like it could be the root cause of my woes? Does anyone know how to test injectors and are they worth trying to repair? Or is there anywhere you can send them to get tested and serviced if possible? I just don't want to do all this work for it to only happen again a couple hundred miles down the road. Sorry for the speel and thanks in advance for any pointers
There are only two tests. Does the injector nozzle dribble/leak under pump pressure. Injector nozzle spray pattern and quantity , timed !
Thanks, dude. Is there any test kits that you can buy to test a home or is it quite specialist tooling?
Injectors are either open or shut , good starting point ! Do you have a "fuel pump" ?? You can rig a simple test kit , injection is either high pressure or low , low pressure ? Around 30/35 or so psi , high 75/80 psi. If you have a pump that gives 30/40 psi you can test. Attach pump to a fuel source and a switched power,12v source, connect pump temporarily to an injector. Conduct two test's. Pump on injector closed, look for dribbling or leakage at the tip/outlet ! Pump on injector opened (powered - connected to 12v) correctly , connected with a switch. Turn both pump and injector on , the fuel should spray in a good pattern ! Circular at point of release , good cone/triangle when viewed from side on ! Injector should spray a good amount , flow should be strong, ?70%?or so of fuel pumps unrestricted capacity at a guess. There should be information somewhere on the inter webs ? A bad dribble or poor flow pattern injector ? Possibly faulty. Check both/all asses one against another all the same and looking reasonable OK , one performing weaker/poorly ? Faulty ?
Awesome, thanks for the info on rough estimates on pressure, for some reason I had 2 bar in my head for fuel pressure but I've no idea where that came from so will aim for around 30 psi and see how it goes and thanks for the info about spray pattern etc. I don't have any kit that I can rig up at the minute but I'll have a think about it and keep an eye out for anything that could work. I think my pal has a spare fuel pump from a cbr, might ask for a lend of it and see what I can jerry rig together will have a look online for some fittings and pressure gauge. Once I've gotten the head finished and rebuilt back onto the block I'll make a start on the injectors and if I remember I'll post some pics up of what I've set up. Thanks again pal
Just text him and he does not have a spare fuel pump. I definitely just imagine things Might be able to put something together with the fuel tank and fuel rail come to think of it
Out in the shed and very quickly chucked together a wee set up to check the sealing of the injectors and it worked but the fuel line o-rings passed so will replace them and try again. No way of knowing what actual pressure is in the fuel rail but I know roughly how long the pump runs when the engine primes so will just do around that time and hope for the best! Yeeha (insert cowboy emoji)
That's a pretty good work around ! A mechanic mate and I did roadside repairs on a six cylinder ford Falcon Utility , we had run out of petrol , the pump sucked up all the muck in the base of the fuel tank. This somehow worked its way past the filter ! We jury rigged up a pump , used rubber fuel line that fit over the injector nozzles , we reverse flushed doing this , roadside injection cleaning This got us up and running again , we were in the "Bush" , got to a City where we could access parts and equipment , where we did further work. We got back home from Qld to WA on this , it originally occurred in Northern South Australia , we did around 4,000 km's on this emergency roadside fix.