scooters

Tonights war effort.

Everything about the bench is on the + size. The hoses and fittings are all -8. It's over kill unless someone sends me a set of 2200cc injectors + it's never going to get close to maxing out the lines. I have spent a lot of time trying to work out how to go between top feed injectors and side feed. If I am going to go to all this trouble I might as well have it fully functioning. At the end of this... If it ever runs and checks out and does what I want it to with a fine degree of acuracy I will be putting the call out for you guys to send in your injectors so I can cross check the rig. You will end up with nice clean injectors and a detail sheet with all the info you could ever want on your injectors. so if You read this far keep it in mind.

insirt taps and other.

I didn't realise that it was you on that hpacadamy page. I have in fact trawled over this page a few different times. I'm glad we both agree that a scope on it's own is a bad way to characterise a injector. Hang time is just as important as the turn on time and needs to be included. What is also great and I am still very much a noob... is the power of excel. And how once it's set right it's good for all the heavy lifting. In your case I can understand the frustration of trying to stage injectors when there is no data. They can set up the batt offset table by looking at the air fuel ratios at idle and changing the electrical loading conditions on the vehicle. As i'm sure you understand this gets them in the ball park and it's ruff enough to get a semi stable idle and most people are never going to find out how close it is until they get a flat battery. But to stage a second set of injectors in at a nominated boost point (or other) is tuff going as things are moving around to much for air fuels to be useful for finding out about injectors. It's all good stuff. Finding out how simple the humble injector isn't.

Yea I can agree with most of that. Like you say voltage jumps around all over the place. 8-16 volts would be the min max range. It has a drastic effect on injectors. As does fuel pressure. What I am making gives me total control over fuel pressure and voltage. That way when I put the injector in the test rig I can be sure that the data I get is correct for characterising the injector. irrespective of the vehicle it's going to sit in. We know that there is lag time between a injector turning on and actually giving a linear amount of fuel. I don't like the term "dead time" the injector is not dead in fact the coil may be energised but the pintle may not have moved quite enough. I feel the best way to describe it is Latency. Did you get your figures by weight? Did you use different fuel pressures?

Now I have the pictures figured out I might as well go on to my top and bottom plates. This was tricky far to tricky for myself and a drill press. It's important for the next part before I go on that I have had outside help. Tony from Entech engine reconditioners gave me a huge hand. When I say huge he did it all for me. So I can't take any credit I just told him what I want and then a few days later I had the alloy back in my hand cut spot on. He is very clever. All cutting I understand was done on a Serdi. A serdi is a machine that is used for cutting valve seats on cylinder heads. I did buy the o rings first and then gave him a tube for a final test fit. But I think you guys will be able to see how it all ended up. Alloy is a pain it can chatter when being machined. So how it has turned out is nothing short of amazing. Tony has also built himself a head flow bench. I can't remember what it pulls but it's up there. If you want to talk race heads I can put you in touch with a very good engine builder who has a lot of passion it. anyway check this out! Far out what is a better photo share site? Photo bucket is going to make me cranky it's so slow.

On the subject of glass I might as well start with that. My tubes have a bigger diameter than the tubes in the first photo. Glass tube is a odd beast. Sometimes the smaller the more expensive it is. Also you buy glass tube length x wall thickness. So you can also do yourself in if your not careful. It's very important with a rig like this that both ends are parallel ground. If they are not you might as well just throw your glass tube at the floor. Parallel grinding does usually add to the cost. The reason that I picked tube and not a graduated cylinder is because once you start dealing with 2L of liquid decanting it becomes a issue after each test. It wont be long before my muppet fingers drop it. Also a hollow tube means I have provision for a drain. As I was saying to will the other night. China seams to value good relationship when dealing with the online market rather than the actual dollar figure. Things like "dear sir" and "please answer me" and "thank you" seam to go a very long way when dealing with them. So here is a pic of my glass. Final figures are: 675mm Length 75mm OD 3mm wall.

So big tubes eh? After much searching I found some tubes. It was nearly the end of the project being that the cost of a glass tube from here in NZ is very expensive....I did not want to use perspex or other plastic due to the fact the fuel will make it yellow off. It's about now I need to mention that when you build a test rig of any sort you need to get close to real world conditions. So there is no point shooting water (for example) Specific gravity and viscosity are critical not to skew test results. If you are going to do something meaningful might at least try. After much looking I found some tubes. I will make a bench that has 6 tubes. The tubes are 675mm tall X 75mm wall OD and the wall is 3mm thick. I can't find the attach button and i'm late for work haha.

Hey Guys. I'm so new it's not even funny to old school. I thought id start a thread on a shed project that started out as something simple and has turned into a thing that is now taking over. All I wanted to do was test fuel injectors. I'm a mechanic by trade so I have the basics. I get that you can touch a injector on a 12v battery and get it to click. But what if we need to find out things about our injectors? I could out source them for a quick service and drop $30 per injector for a quick buzz in a ultrasonic bath.... But I think we are only scratching the surface. What if we need to find out some data? I think these little clicking givers of fuel are more important than you think. for a start: Battery offset standard dynamic service of injectors deviation vs pulse width injector latency injector linearity This will get us started. I am going to build a injector test rig that will do far more than a injector test machine. Im at a total loss why a quality test bench like a ASNU costs $12.000 kiwi. It's just out of control and will give no control over injector voltage. So with that for a intro i'll just leave a few pics and come back in the weekend. This is the pic that started this all off. It's a big dollar bench that is run on a haltech. It has the grunt to handle injectors of 5000cc it's the balls if you run methanol or if you want to know about injectors. What I will build will be first of all the prototype and a proof of concept that I can develop out. many more pics to come.