Since the photo's I've switched to a scale accurate to .1g instead of the graduated cylinder. Its run by my M800 and laptop (laptop simulating engine sensors through printer port)

 

looks like a sic beer tap rofl.

 

it could be adapted to pour perfectly measured shots lol

 

Whats the goal with you beast?

 

I've got some really big injectors that don't work properly at normal peak and hold settings and need some dead time adjustments to run correctly. We also develop parts for various car including turbo kits and tune's to go with the parts sometimes injectors are included and it would be nice to see what kind of spray pattern we get from the various options as well as actual dead times and flow rates (you would be surprised how inaccurate some of those little sheets are that come with injectors)

 

I would not be surprised nor would I expect them the be well balanced

 

If you want real dead time and fuel injector data, check out www.Yawpower.com

Your contraption is cool, but is missing a few things to say the least if you want accuracy.

 

Actually by using the M800 for logging at 200hz, an oscilloscope connected to my computer for open/close times, and a scale accurate to .1g I have been able to log repeatable results accurate to 1cc/min and open/close times to better than .01ms. I can fill out every page in Paul's spreadsheet with my flow bench more accurately than I can input the results into my ecu. Just because I didn't buy it as an assembly doesn't make it inaccurate. While it might have been cheap for me to make since I already had the parts when you look at it it's really over 7k worth of logging and measuring equipment.

I do currently have an issue with evaporation and fuel temp which will both be alleviated by some test fluid that is used in the industry (hopefully along with my headache lol)

 

Test fluid has a different viscocity, that in itself will skew your results.

Do you have any form of pulsation dampning on the system?

Temp control is obviously a big factor, which you know.

It's a cool deal you put together, and obviously miles ahead of what most people are doing. Just letting you know that you could get the info you are looking for for $35 in case you didn't know. Sounds like you already knew about it and just wanted to do it yourself. No biggie.

 

Yeah I know, this is free though (well maybe $20 in materials) if I don't count what I already had. I'd rather do it myself for the learning experience, I have definitely learned a lot about injectors that I otherwise wouldn't have. I have a few dozen injectors I would like to eventually test which would add up pretty quick at $35 a pop, most of which would never get tested if i didn't do this.

I know about Yaw Power and have actually used them in the past and would recommend them to any of my customers (I definitely won't be flowing other peoples injectors) they are miles ahead of any other cleaning/flowing service that I know of. I have a factory honda fuel damper on the system that I don't use (yet)

A few things I've learned and a few that I will look into:

even with a huge volume of fuel on top of the injector (more than is in my hole fuel rail) the pressure pulse are significant (2-3psi) probably higher at the actual injector top. - will test the honda damper

at my idle pulse width (including dead time) the injector drips occasionally not sure if this would be the case with the fuel I'm running since its much less viscous and evaporates a lot easier. (will test)

temp control is a HUGE issue, a small (.5 gallons) of fuel gets hot FAST maybe a fuel temp sensor on my car would be worth looking into.

large injectors are in general poorly balanced and individual cylinder comp should be used even if you don't have egts to tune with (I do but still valuable info)

static balancing does not mean your injectors are dynamically balanced

over 90% duty cycle is a disaster

below 10% duty cycle is worse

lambda feedback is useless unless your injectors are set with proper dead time values

most recommended peak and hold setting drastically overpower your injectors

using a resistor pack on low impedance injectors is a bad band-aid

The test fluid I am getting is specifically designed for fuel injector testing so it should not be much difference than gasoline although I will obviously check this when i get it and maybe apply a correction factor. Most of these results are not "surprising" but until you see it for yourself you don't take it that seriously especially when you car is running "fine" its interesting just how drastic the results are.