Bosch Fuel Injectors

[Chaz]

whats the issue with using high impedance to replace low impedance ones?

10 -12 ohm's

[90 5.0]

the fuel injectors are hose clamped from the factory
if you want to stay in the same ohm value you could use these
http://www.fiveomotorsport.com/obd1-...es-450-550-650
you would have to make your own fuel rail
and use junior timer connectors
http://www.digikey.com/product-searc...51-3&vendor=17
plus is they also fit the laser intake

Five 0 motor sports?

is that a mustang injector? The plug looks right?

how many #/hr are 2.5 injectors?

I've got some left over 19# injectors if I can use them? And maybe some 24.
My 36 and 80's are all gone though.

[powerabout]

10 -12 ohm's

sure but its more resistance not less.
Cant go the other way thats for sure but low to high whats the issue?

[Chaz]

Peak and Hold ... low

Saturated ... high

And the drivers that love them ....

[powerabout]

I just emailed the guy making the current Merc F1 efi who also made the OMC F1 v8 CFI pack back in the day and he said both will work with high impedance.

[patchesII]

High impedance injectors are easier on the drivers. I know for a fact the Mercury ecu will run them

[Chaz]

I just emailed the guy making the current Merc F1 efi who also made the OMC F1 v8 CFI pack back in the day and he said both will work with high impedance.

What is the average flow rate ( @ 3 bar / 43.5 psi ) of the two above mentioned systems ... ?

You can answer in either cc/min or lbs/hr , which ever is more convenient ....

BTW , did he happen to mention BSFC numbers of either combination ... ?

[patchesII]

The Mercury injector falls somewhere around 37 lb/hr

[powerabout]

he recommended the 55/lbs.hr so an injector simialar to what is used in the gt550 mustang
bsfc must be better with the new multi spray hence emissions which i guess is why they are all like that now.
cc injection has very little time to mix so should help with Merc's?

[cyclebuilder]

Let us know how the new one flows. I just won an ebay auction for 4 old stock unopened for $375. 3 are from the bosch Spain factory and 1 is from Germany. I plain to have them tested against my remaining 8 good ones as soon as they ship.

[RichS]

The flow spec I've seen on the Bosch '036 (merc blue top injector) is 46#/hr @ 3 bar...

[jmadisonbiii]

Let us know how the new one flows. I just won an ebay auction for 4 old stock unopened for $375. 3 are from the bosch Spain factory and 1 is from Germany. I plain to have them tested against my remaining 8 good ones as soon as they ship.

I just got back my ebay injector from Brucato. Out of the box it flowed 233.71 cc/min @ WOT and 110.51 @ idle/part throttle, which is right in line with where my others were after cleaning/flowing. For what it's worth, my "total system lbs/hr." was 290.59, which is 48.4 lbs/hr. per injector.

[Chaz]

he recommended the 55/lbs.hr so an injector simialar to what is used in the gt550 mustang
bsfc must be better with the new multi spray hence emissions which i guess is why they are all like that now.
cc injection has very little time to mix so should help with Merc's?

Power , in all sincerity I do hope that some day we can find a common language .. untill then , we are stuck with English .
Just to clarify a bit ....

Mustang .. ? I take it you are speaking of a Ford .. ?
If so , the base 5.0L ( 302 ci ) uses a 73 lbs/hr injector .

BSFC is a measurement in efficiency . As in , how much work an engine can do with a pound of fuel . Base rule of thumb being , .5 BSFC or half a pound of fuel per hour per horsepower.

Take you emission's fetish out of the equation for a moment , explain to me what a :
"new multi spray" is ... ?
And why have all manufactures have moved to this system ?

cc / minute is another unit of measurement that bring's you to the answer . However it is much more finite and practical to deal with volume rather than weight .

Back to the language barrier for a moment ....
cc injection / time to mix what / and why would Merc benefit above all others ? ? ?

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The way the guy at the F I Clinic test's an injector is at 80% cyclic rate is , above that and the pintle doesn't have a chance to fully seat between events .
Which makes sense.
Because there is no way to accurately test a part which you have no control over ....

[powerabout]

the old low z injectors spray fuel out like a garden hose in one stream.
All the modern injectors have a very fine multi spray to atomize the fuel which might help to get a better bsfc one would think? ( but who cares in a race engine)
that 5.0 stock injector sounds very big to me?
Dont forget to check at what fuel pressure they have been rated at

[Chaz]

The Ford , that was a Pro-Charger deal I did some fab work on years ago . 73's are what he used ...
My stance , I have a Ford truck so I wont be tempted to *^%$&* with it ....

Anyway , as soon as you say "multi spray" that insinuates "more than one discharge exit" . I'd like to see one of them .. Is it similar to this ?

It's been proven years ago that discharge location has little influence on end result efficiency . And I'll bet people who build state of the art racing engine's are some of the pickiest when it comes to fuel load.
The 410 W.O.O. (winged sprint) motors went thru a phase there the nozzles were high on the inside out of harms way and plenty of time to atomize , moved lower on the outside ( black plug) to ease a jet change . They started splitting entry points , now they just go thru the head and dump all the fuel on the backside of the valve stem . Keep in mind that these are alky burners and stoichiometric is double that of gasoline ... 1 lb/hr=1HP
Not a lot of time to chop it up , even less on new tree hugger friendly direct injected two strokes ...