V6 injectors, better and/or larger
Discussion
There seem to have been some development on injectors since Ford made the 2.9 V6 back in the 80's.
Has anybody here tried to swap in some new injectors with potentially better spray pattern and/or possible higher flow rating?
For the cat engine I think the originals are Grey Bosch EV1 model with about 160 cc/min = about 15 lbs/h.
That sounds on the low side. I checked with some sources on the internet that say that a reasonable guestimate to keep opening times low is;
(Horsepower X BSFC) / (number of injectors X injector duty cycle)
Where BSFC is some kind of fuel efficiency constant set at 0,5 for normally asperated engines. Duty cycle should be kept under 80% at WOT to keep temperature low.
This would imply that for a standard 175 BHP S V6 that the injectors should flow about 19 lbs/h, ie more than stock.
With some tuning, ie cam, exhaust and ported heads, we could reach say 200bhp which would need about 21 lbs/h.
Does this matter. Has anybody tried to increased flow and/or put in better (modern spray pattern) injectors.
Both interesting from BHP and mpg viewpoint.
All the best
//Rob
Has anybody here tried to swap in some new injectors with potentially better spray pattern and/or possible higher flow rating?
For the cat engine I think the originals are Grey Bosch EV1 model with about 160 cc/min = about 15 lbs/h.
That sounds on the low side. I checked with some sources on the internet that say that a reasonable guestimate to keep opening times low is;
(Horsepower X BSFC) / (number of injectors X injector duty cycle)
Where BSFC is some kind of fuel efficiency constant set at 0,5 for normally asperated engines. Duty cycle should be kept under 80% at WOT to keep temperature low.
This would imply that for a standard 175 BHP S V6 that the injectors should flow about 19 lbs/h, ie more than stock.
With some tuning, ie cam, exhaust and ported heads, we could reach say 200bhp which would need about 21 lbs/h.
Does this matter. Has anybody tried to increased flow and/or put in better (modern spray pattern) injectors.
Both interesting from BHP and mpg viewpoint.
All the best
//Rob
sebackman said:
Has anybody here tried to swap in some new injectors with potentially better spray pattern and/or possible higher flow rating?
Do you have an engine that is running out of fuel capacity?If you increase the injector size you'll need to recalibrate the ECU and will need to sacrifice fuel control at low load. If you need more fuel at the top end that's obviously a good reason to do it, but if you don't need more fuel then it seems a waste of time and money.
Thank you for the link. I appears that the newer injectors does have a real IRL advantage regarding spray pattern.
I will order a set of the same they talked about, Bosch 0 280 155 759. The Brownish ones. They are a little bigger (330cc) but I can always reduce fuel pressure a little if needed or have the ECU reduce open time.
Anyone here tried to change on an S?
//Rob
I will order a set of the same they talked about, Bosch 0 280 155 759. The Brownish ones. They are a little bigger (330cc) but I can always reduce fuel pressure a little if needed or have the ECU reduce open time.
Anyone here tried to change on an S?
//Rob
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