Injector thread

[lowrider]

i know ive seen an injector thread on here for what the pound is and what to get them out of. but i can find it no where on here. i could use some help finding it because now ive got an injector leaking down and giving me a start issue. i want to with a bigger injector than whats in it stock but funds are low right now. any help would be great

[PolarXJ]

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, ...Black, ........39psi, .................18.6lb/hr
'91-'93, ........33007127, ...Brown, .......39psi, .................21.0lb/hr
'94-'95, ........53030343, ...Tan, ...........39psi, .................21.0lb/hr
'96-'99, ........53030778, ...Grey, .........49psi, .................23.2lb/hr
'00-'01, ........04854181, ...Blue tip, .....49psi, .................22.5lb/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)
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)

http://www.jeep4.0performance.4mg.com/tech_specs.html (LINK for above info)

http://www.ausjeepoffroad.com/forum/showthread.php?t=92236 (another link)

I picked up some from '95 dodge neons (part no. 0280155703), though I haven't installed them yet. These will work for my '95 XJ. Verify the part no. on the side of the injector, some '95 have a different electrical connection. I found this out by pulling some other injectors from what was marked '95 neons by the JY (granted I didn't verify the actual door manufacture sticker, and so the neon could have been newer) and they had a different electrical connection (which appear to be similar to the ones I pulled from my '05 TJ motor). The part no. of those ended up to be 0280155740

[PolarXJ]

Here's some more info


Part #--ohms--cc/min--lb/hr
0280 155 703--12.0--238--23
0280 155 705--14.2--194--18
0280 155 715--14.0--256--24
0280 155 721--11.8--250--24
0280 155 734--14.5--260--25
0280 155 737--12.2--352--34
0280 155 740--12.2--240--23

"pulled from here" (http://www.naxja.org/forum/showthread.php?t=1042594&highlight=engine+swap)

[lowrider]

sweet man thanks. thats one of the ones i was lookin for on here