LBZ: Do LLY injectors fit LBZ heads?

[McRat]

Yes, physically. I just put an LLY injector into an LBZ head. Now I need to check voltages.

Glowplugs ARE NOT interchangeable, not even close. I don't know if you can hook up LBZ glowplugs to LLY wiring.

The water pump has a larger diameter exit, and different water line routing, but you can stretch the LLY hose over the top.

The reluctor wheel on the camshaft has a different number of teeth. The LBZ has one more. So you can grind one tooth off and use it. We did this on Casper and it worked.

I'm checking on this stuff so we can tell what you have to change on an LBZ head or engine to drop into an LLY. Glowplug and injector voltage are the only unknowns I haven't personally verified.

 

[stacks04]

the lbz injectors need to be programmed with the tech 2 to the ecm in order to work. if the numbers porgrammed to numbers actual that the ecm see's don't match they don't work. not sure if you used a lbz injector with lly ecm though.

 

[LBZ]

I don't know if it will work Pat. Isn't there something different in the voltage applied to the LBZ/LMM? LLY is 48Volts or something and I thought the LBZ/LMM was higher. I may be wrong though.

 

[SIKDMAX]

Im pretty sure the voltage differences are in the glow plug & controller...

 

[LBZ]

Would a 48 volt FICM operate a 100V injector solenoid? Or vice-a-versa? Doubtful.

Very interesting Pat. Test and see I guess.

 

[slowlmm]

pat isnt a LBZ LMM injector bigger ? it has a tappered shaft tht is a few thousands raised unlike the lly injector is perffictaly smooth. we found this out when we they sent the wrong injector out to glamis for johnnys truck they sent a lbz and it wouldent go alll the way in becuase of the taper ? so i dont know tht a lly injector would sela properly in a lbz head ?

 

[duratothemax]

Im pretty sure the voltage differences are in the glow plug & controller...

what does that have to do with the injectors

 

[duratothemax]

Would a 48 volt FICM operate a 100V injector solenoid? Or vice-a-versa? Doubtful.

Very interesting Pat. Test and see I guess.

as far as I know LBZ injectors operate on either 24vdc or 12vdc. Its definetly not LLY spec (48vdc) or LB7 (96vdc), because the LBZ injectors are driven by thge ECM directly and its not like teh ECM has any large heat sinks or fuel cooling..

 

[SmokeShow]

Pat, is the engine in Casper an LLY (meaning it uses LLY injectors and tuning) or is it LBZ???

Why are you converting to LBZ??? Are they clearly better or what? I'm not starting a riot, I'm honestly curious if you think the LBZ is better overall. I may be doing this (converting an LLY to LBZ) very soon pending funds and, honestly, your reply to this post.

Final thought, how much difference to convert LLY to LB7?


I'm just weighing options here.

Thanks!
Mitch

 

[SIKDMAX]

I don't know if it will work Pat. Isn't there something different in the voltage applied to the LBZ/LMM? LLY is 48Volts or something and I thought the LBZ/LMM was higher. I may be wrong though.

Im pretty sure the voltage differences are in the glow plug & controller...

__________________________________

what does that have to do with the injectors

Happy Ben?

 

[McRat]

OK, LLY & LBZ injectors have .277" DIA nozzles, LB7's have .353" dia.

There is no taper. Just carbon buildup.

Injector and glowplug voltage needs testing. I will try to do that tomorrow, I got sidetracked all day.

Casper has run a combination of LB7/LLY/LBZ parts.

Current engine is all LLY long block with LBZ intake manifolds, LB7 pass riser pipe.
Last engine was LBZ shortblock with LLY heads, and LBZ intake manifolds.

Spare engine is LLY block, LBZ heads.

 

[McRat]

I'll admit I have not played much with LB7's.

 

[SmokeShow]

OK, LLY & LBZ injectors have .277" DIA nozzles, LB7's have .353" dia.

There is no taper. Just carbon buildup.

Injector and glowplug voltage needs testing. I will try to do that tomorrow, I got sidetracked all day.

Casper has run a combination of LB7/LLY/LBZ parts.

Current engine is all LLY long block with LBZ intake manifolds, LB7 pass riser pipe.
Last engine was LBZ shortblock with LLY heads, and LBZ intake manifolds.

Spare engine is LLY block, LBZ heads.

how you gonna do the lly w/ lbz heads as far as electronics in your lly truck???

 

[McRat]

how you gonna do the lly w/ lbz heads as far as electronics in your lly truck???

Either make GlowPlug dummies and remove the glowplug circuit, or just run LBZ glowplugs with the LLY controller.

I will just bolt LLY injectors in the LBZ heads.

 

[slowlmm]

on the body itself of the lbz injector there sure is a taper ill grabone from john and show you the diffrence in the two. the lbz injector would not phically go all the way in becuase of this verry small taper on the injector body this was a brand new injctor out of a box tht had the taper on it

 

[duratothemax]

OK, LLY & LBZ injectors have .277" DIA nozzles, LB7's have .353" dia.

There is no taper. Just carbon buildup.

Injector and glowplug voltage needs testing. I will try to do that tomorrow, I got sidetracked all day.

Casper has run a combination of LB7/LLY/LBZ parts.

Current engine is all LLY long block with LBZ intake manifolds, LB7 pass riser pipe.
Last engine was LBZ shortblock with LLY heads, and LBZ intake manifolds.

Spare engine is LLY block, LBZ heads.

lbz glow plugs are 4.5 volts IIRC

 

[McRat]

At this point, all I know it the nozzles are the same dia and length. The LLY will go into an LBZ head, but I don't know if the reverse is true.

The area that was the problem, can you identify? Use inch marks as ref.

 

[McRat]

I'm a retard. In small lettering on both LLY and LBZ glowplugs, it says 4.7v so they should be the same electrically.

See pic for why they are not interchangeable:

 

[duratothemax]

doh! 4.7 volts. Memory must be getting tired

 

[SIKDMAX]

I stand corrected....