Another injector question

[jyancey at twrol.com]

RCE (RC Engineering) sells the best quality injectors that I know of...
and given how important an injector might be to you, I wouldn't try for
the "cheapest" solution. They are decently priced, and they will send you
all the flow rates on the injectors at (usually) 55psi or so.

Unless you have the equipment, all you can tell as far as an injector is
there flow rate during a given time while holding the gates open.
Increasing pressure etc you can only figure out mathematically unless you
have the testing equipment to test the real numbers and effects.

Joel

On Thu, 25 Jan 2001, Steve Ruse wrote:

> Hi, my name is Steve Ruse, and I am much in the same position as James. I am working on a fuel injection system for a Formula SAE car at LeTourneau University. I have a lot to learn, and this list looks like a great place to do that. 
> 
> The engine is a 600cc four cyl from a Honda CBR. I also own a '94 Z28 and do custom EEPROM tuning on it, that is basically where I "cut my teeth" on EFI.
> 
> I am interested in the answer to James's last question, and I have also have some questions of my own.
> 
> First, what are some good sources for injectors? We have some for testing, but I don't think they are the ones that we will want to use in the end. 
> 
> What is the best way to test the flow rate of our injectors? Is there something better than just timing how long it takes them to move a given amount of fuel?
> 
> Also, how can we account for the open/close delays of our injectors? Could that be accurately determined accurately by varying the duty cycle and seeing how the flow rate changes from when the injectors are at 100% duty cycle? Is there an easy way to keep our fuel pressure constant while performing this test? We were just going to try using an automotive fuel pressure regulator.
> 
> Thanks!
> Steve Ruse
> 
> 
> -----Original Message-----
> From: james.drysdale at utoronto.ca <james.drysdale at utoronto.ca>
> To: Fuel Inj Mailing List <diy_efi at diy-efi.org>
> Date: Wednesday, January 24, 2001 2:35 PM
> Subject: Another injector question: flow rates
> 
> 
> 
> Thanks for the responses to my previous question! (Even the ones from those 
> guys at Queens :)
> 
> Here's another: What's the difference between static and dynamic flow rates for 
> fuel injectors?
> 
> The spec sheet for my injectors lists both, but which should I use to calculate 
> the pulse width? (I'm thinking dynamic, but what's the difference?)
> 
> 
> Thanks again,
> 
> james
> 
> 
> "God help us. We're in the hands of engineers."
> - from Jurassic Park
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