How many pounds an hour are the fuel injectors?

[beemer]

On a 95 D1 I was planning on also changing the single spray pattern injectors to 4 hole spray pattern injectors. Already did this swap to a 87 325is BMW of 2.5 litre and it idles smoother plus increased performance and fuel mileage with cleaner smog test readings.

I know the 3.9, 4.0 (stupid as same bore & ****** fooled the public) plus the 4.6 litre all use the same size in pounds per hour injectors. I have not a clue what they are in Rovers. All my manuals are in storage and not handy at the moment. At Pick N Pull the Ford 302 ** engines have 4 hole 19# injectors. With a collecton of extras for two engines I can flush and flow check for a balanced spray volume set as well a spray pattern.

 

[joey]

http://www.fiveomotorsport.com/Injector_SetsENGLAND.asp

 

[antichrist]

Not sure I'd fool around with used when new are so cheap.
http://www.summitracing.com/parts/FMS-M-9593-C302

 

[joey]

Nice price there Tom... thanks for the link.

 

[Baylink]

Is that Summit set a drop-in replacement, or do you have to recalibrate stuff when you switch to them?

 

[joey]

drop in, same part i linked too but cheaper

 

[antichrist]

I installed a set of these last Wednesday. Took me about an hour or so. Runs a lot nicer now.

I ended up getting them here:
http://www.streetsideauto.com/products2.asp?brand=BDXX&partnumber=M-9593-C302

Summit has a store in Georgia, so with shipping and tax it would have been $245. Streetside was free shipping. I'd never heard of them so I called to check stock and when they'd ship and they also gave me a $25 off code to use online so they were only $194. They were easy to deal with and I had them in hand in 2 days.

 

[joey]

Tom, how was it running prior to the install and what was the improvements?

 

[antichrist]

Running rough and low power. The power improvement isn't fantastic as the engine is generally worn with 260k on it, but it's noticeable.

 

[beemer]

Not sure I'd fool around with used when new are so cheap.
http://www.summitracing.com/parts/FMS-M-9593-C302

Those 19# injectors are too small, Rovers stock older single squirt Lucas design flow 24#.
The later design disc 4 hole Bosch units of 24# give a finer mist allowing for better combustion, cleaner exhaust number readings, better bang with a smoother idle and a faster throttle response. Technology of injectors has improved a vast amount over the past 12 plus years. There must be a reason why Bosch and other manufactures switched from single squirt to disc 4 hole injectors. This one change alone woke up the BMW engine with nothing else changed a rather tightly controlled test. Same with the Rover. Purchasing new injectors can have up to a 10% difference in flow, this within manufactured standards. A good injector cleaning service will get your injectors down to 3% balance. Racing motors 1% maximum flow balance difference down to zero % flow balance difference, this you will pay extra for. With .4% balance difference and no cost of the injectors out of pocket for me it's a win win. Just the time spent building the PWM and Hz injector driver plus the pressure chamber. A fun project that will be used on future FI motors.