Hi All, I am fortunate in that I am able to service my own injectors using a DC power supply, pulse generator, ultra-sonic cleaner and now use my newly constructed spray pattern tester. Anyway, I have noticed that some of you are paying a high price for injector service consumables. So, for those of you contemplating servicing your injectors (even simply replacing the seals) then you may find the following of interest: a) Nissan Buffer Insulator (fits under the metal cap) ACA part number S5052, pack size is 10 units, Approx cost $45/pk b) Nissan Injector Seal (Upper 'O' ring) ACA part number S5049, pack size is 25 units, approx cost $60/pk c) Nissan 'O' Ring (Lower 'O' ring) ACA part number S5053, package quantity 25 units, approx cost $45/pk d) Nissan Buffer Insulator (the lower plenum 'O' ring) ACA part number S5054, package quantity 25 units, approx cost $55/pk These parts should be available from a good auto-shop (may have to be ordered) and the prices shown are trade. Never-the-less you can buy the larger quantity and maybe share costs with a friend. You need six of each item (a to d) and I understand a ready supplied kit costs about $150 each (phew!! what a profit!!) Anyway guys and girls - you do the maths!! Cheers
Cleaning gear...>> IB is quite correct.....wife is not happy!! a) Ultrasonic cleaner with timer (never used to clean jewelry - I'm still in the sh*t with the wife) b) Pulse Generator is a Function Generator (DSE part Q1826). This will soon be replaced by a Tektronix type 114 pulse generator so that I have greater control of the pulse shape and frequency. c) Oscilloscope Topward 7046 (Analogue). This will soon be replaced by a Tektronix TDS420 (Digital Storage). Use the oscilloscope to verify the pulse shape. d) Power Supply (0 to 30Vdc up to 2.5Amp, DSE Q1770). Seems to do the job. e) High speed switch with 200 ohm input impedance (as pulse generator cannot directly drive the injector) f) Spray pattern tester is self made from surplus zed bits (not hard to do). g) Solvent solution is Nulon Total Fuel System Cleaner (about $25/bottle). Expensive but good stuff!! The approximate total cost for all of the above equipment is about $1,200 (as most was second hand stuff). Cheers PS: I'm donating my surplus oscilloscope and pulse generator to another zed owner in Canberra who is setting up another injector test rig.
So most of that gear is for testing the injectors after cleaning rather than the actual cleaning? Hmmm.... I have a heap of injectors I want to do (about 22 all up), might be the way to go. Would it be possible to rig something up with a ECU and some other tricky doovers to save buying a scope and some of that other fancy stuff? It's not the kind of stuff that I would use often
Huh...>> The injector is pulsed while it sits in a injector cleaning solution in the ultrasonic cleaner. It is later inserted into a fuel rail and then pulsed again while observing the spray pattern. It is possible to add injector cleaner to the petrol used to check the spray pattern to further enhance the cleaning process. Also, it is easily to vary the pulse duty cycle and frequency while also observing the spray pattern with the injector in the fuel rail. If required it is also possible to measure the volume flow using an additional metal container (I have not done this yet but am thinking about adding this feature to my test rig). This is about as close as you can possibly get to testing while actually cleaning. If you want to do it another way using an ECU then go for it but, I think this is unnecessary. Frankly, I think my method is perfectly valid for testing injectors. Cheers
I'm looking at it from a cost point of view, I have a heap of Z parts hanging around that I could probably adapt which would cost next to nothing. I'd rather do that than buy a scope and a pulse generator thingy.
Fair enough...>> I have six zeds of my own so I don't mind spending a bit of time and money on a proper set-up (Yes, they are all running!). It's also amazing how quick your mates turn up with a fuel rail in their hands once they find out what your doing even if it's all experimental (actually I really don't mind giving them hand as I eventually get plenty of help back later). Not sure how many fuel rails I've done but it would be about 8 to 10 by now. It also helps that I'm an electrical engineer and also have great technical and hands-on support from a few enthusiastic amateurs who really know their stuff. Good help is never too far away in little Canberra. Cheers
You can do a pretty good job cleaning injectors with an ultrasonic jewellery cleaner, injector cleaning fluid and a 7 volt DC power source. You use the 7 volts DC to open the injector while it's bathing in the solution in the ultrasonic cleaner. We have found that pulsing the injector while it is in the ultrasonic cleaner gives a better result faster. To make a good cleaning rig cheaply, you just need to work out how to switch the 7V several times per second.
Pretty sure 7 v is enough to open them, ive used the little 9v batts before with good success, May be able to get alittle kit or something from jay car to do the switchin . Trev
Never supply 12V to the injectors, they really only see 9V in operation. While they have 12V on the positive, they don't get a full earth. The earth is actually 3V giving a 9V differential. Note: this is for high impedance injectors, low impedance injectors should only be supplied 3V.
Can you give an idea of the specs of the high speed switch ? Im assuming its just a relay which you are driving with the function generator ??
Relay..>> Hi, I have boxes full of electronics components ranging from diodes, resistors, relays, LED's and IC chips. A few months ago while scrounging through this box I found a relay with a 200 ohm input resistance which I needed because the function generator needs at least a 50 ohm load. Tested this relay up to about 50 Hz and seemed to work ok without contact bounce. So, I used it with the function generator to switch the 7Vdc from the laboratory power supply to the injector and I used the CRO to look at the wave-shape which was acceptable. I usually pulse the injectors at about 10 to 12 Hz (which I think is equivalent to injectors working at about 1200 to 1440 rpm for a four stroke motor. I just checked the DSE web site and there appears to be a relay or two that have similar performance. I think I bought this relay many years ago from DSE when it was actually owned by trick dicky himself.:biggrin: Cheers
