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Little power adders


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23 hours ago, Eagle said:

 

Thanks for making me feel my age. :(   :slap:

 

I'm old enough to remember the days when a zero to 60 time of 10 seconds flat was considered to be FAST! That was once sort of the automotive equivalent of a 4-minute mile.

I learned to drive in a 1978 Olds with the 5.7 diesel.  0-60 was pretty close to the 1/4 mile time. (19.8 0-60 with a 22.6 1/4 mile).

 

Looking back, having a slow car like that probably saved my life.

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26 minutes ago, Swampy said:

Just to chime in which 4 hole injectors fit the 4.0? Ones off a mustang I have heard or the ones from an explorer?

 

I don't know for sure, but I'd wager that both will work. :L:  there are a plethora of injectors out there that will have 4 hole but not too much of a flow rate (neons and volvos come to mind).  for some reason fuel injectors are remarkably interchangeable (outer dimensions at least) across time and space and brands. :dunno:  (meanwhile I had to go buy a 7mm and 11mm allen wrenches to do the brake pads on the Durango :fistshake2: and when I finally need to do the rotors, I gotta buy a giant reverse torx!  :doh: )

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37 minutes ago, Swampy said:

Just to chime in which 4 hole injectors fit the 4.0? Ones off a mustang I have heard or the ones from an explorer?

You really need 21lb injectors. The Mustang injectors are 24lb. They are 4 hole. Here is some info on injectors courtesy of Dino Savva.

 

Injectors

Some of those specs that are hard to find in any workshop manual.

The following is a list of the injectors used on the 4.0L since 1987 along with their rated static flow:

Model Year, ...Part #, ...........Colour, .....Fuel Pressure, ...Static Flow,
'87-'90, ........53003956, .........Dark Tan,.......39psi, .................21.0lb/hr
'91-'93, ........33007127, .........Brown, ..........39psi, .................21.0lb/hr
'94-'95, ........53030343, .........Tan, ..............39psi, .................21.0lb/hr
'96-'98, ........53030778, .........Grey, ............49psi, .................23.2lb/hr
'99-'04, ........04854181, .........Blue tip, ........49psi, .................22.5lb/hr
'05-'06, ........53013690AA, ....Brown tip, .....58psi, .................25.4lb/hr

The injector flow rate varies as the square root of the pressure drop across the injector. The stock '91-'95 4.0 injectors are rated at 22lb/hr @ 43psi fuel pressure, so at 39psi they flow ( sq. rt.(39/43) x 22.0 = 21.0 ).
For stock/modified 4.0 engines or stroker build-ups the following injectors can be installed. The flow rates are:

Ford Motorsport 19.0lb/hr @ 39psi (Part no. FMS-M9593-C302)
Ford Motorsport 24.0lb/hr @ 39psi (Part no. FMS-M9593-A302)
Ford Motorsport 30.0lb/hr @ 39psi (Part no. FMS-M9593-B302)
Bosch 0280155712 19.4lb/hr @ 43.5psi
Bosch 0280155703 22.7lb/hr @ 43.5psi
Bosch 0280155715 23.7lb/hr @ 43.5psi
Bosch 0280155849 24.5lb/hr @ 43.5psi (same as Ford XF1E-A5B)
Bosch 0280155784 26.3lb/hr @ 43.5psi
Chevy LT1 24.0lb/hr @ 43.5psi (Part no. 17124248)
Chevy LT4 28.0lb/hr @ 43.5psi (Part no. 17124251)
'98 Chevy LS1 25.2lb/hr @ 58.0psi (Part no. 12533952)
'99-'00 Chevy LS1 26.2lb/hr @ 58.0psi (Part no. 12456154)
'01-'02 Chevy LS1/LS6 28.6lb/hr @ 58.0psi (Part no. 12482704)
Accel 19.2lb/hr @ 44.1psi (ACC-150119)
Accel 21.1lb/hr @ 44.1psi (ACC-150121)
Accel 24.4lb/hr @ 44.1psi (ACC-150124)
Accel 25.6lb/hr @ 44.1psi (ACC-150126)
Accel 29.4lb/hr @ 44.1psi (ACC-150130)

The '95 Jeep 5.2 ZJ/Dodge 5.9 injectors (Part no. 53030262) are rated to flow 24.6lb/hr at 39psi.

The selection of injector size will depend on the estimated horsepower output, brake specific fuel consumption BSFC (assume 0.5), no. of cylinders, and the injector duty cycle (assume 80% or 0.8). The formula is:

Injector size (lb/hr) = (horsepower x 0.5)/(no.of cylinders x 0.8)

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