Injectors
 

will second gen 12 valve injectors work in an intercooled first gen?

No. Couple reasons why. First the injector line nut is teh wrong thread, 2nd the pop pressure is off and finally the spray pattern is not perfect. You can put 2nd gen nozzles on 1st gen bodies and reset the pop pressure to work with teh VE but you still have a funny spray pattern.

:argh:

nope they sure wont sorry bro

The spray pattern on the '91-98 intercooled 12v engines are the same 145°...

so putting the nozzles on the bodies would work, but what would be the downfall to the different spray pattern, if there is a difference. would the truck run ok?

I didn't know there was a debate.

I was under the impression that the spray angles were different on the 94 up trucks. I read that everywhere.:humm:

I thought they were also Richie, Getting mixed storys from a few different respectable injector guys.

The DSLA number designates the spray angle:

'89-91 DSLA155 P104 4x0.014"
'91-93 DSLA145 P265 6x0.010"
'94-98 DSLA145 P464 5x0.009"
'96-98 DSLA145 P477 5x0.010"

This should clear up the confusion.

How about 89-90 injectors?

Check the edit on post #10.

Ok so its only the non-I/Ced injectors that are different. Good to know. Thanks for clearing that up Weston!

I think the confusion is when someone uses a stock marine tip ( 370's and 435's ). Those are the ones with a different angle due to a industrial p pump having a different piston bowl. Weston, are we getting warmer??

The 435 is not a Marine nozzle, it is just a slang term given to the hone size 5x0.014". I have only read where the 1st Gen nozzles were 4x0.012" and 6x0.009", however that is not the case.

A QSB6TA ( marine 6b ) is available in a 435 horse application. I have seen them listed in the National Fisherman yearly boat engine edition.

Is it true that the industrial b's have the bigger piston bowl then the 91.5 to 98's had?
I know the 89 to 91.4's have a bigger bowl.

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Actually they are even higher now. Here is a cut and paste from there web site.





Model Name kW BHP MHP RPM Rating

QSB5.9-230 168 225 230 2600 High Output
QSB5.9-230 169 227 230 3000 High Output
QSB5.9-305 224 300 305 2600 High Output
QSB5.9-330 243 325 330 2800 High Output
QSB5.9-355 261 350 355 2800 High Output
QSB5.9-380 280 375 380 3000 High Output
QSB5.9-440 324 434 440 3400 High Output
QSB5.9-425 313 420 425 3000 High Output
QSB5.9-480 352 472 480 3400 High Output

The 12v Marine 5.9L does use a larger piston bowl than the automotive versions. The Diamond series is mechanical, highest hp rating is 370, the Quantum series is Common Rail, highest hp rating is 480. The "435" injector is not available in any stock 12v application.

You are correct. The first link is the QSB6TA which lists fuel system as electronic HPCR ( i assume it means high performance common rail ). Those are the high hp models.

Cummins MerCruiser Diesel | QSB5.9


This second link is for the 6bta's. These are listed as P7100 pumps and go to 370.

Cummins MerCruiser Diesel | DIAMOND 330B


:tu:

I think it really helps people to decide what to purchase, when they know what they have to begin with.

well said weston, it does help

Larger then even teh non-I/C'ed engines?

Yes.

Is that also how the marine engine ends up with a lower comp ratio?

Yes.

'89-91
http://photos-d.ak.fbcdn.net/hphotos..._4842487_n.jpg

'91-93
http://hphotos-snc3.fbcdn.net/hs106....1_564474_n.jpg

370 Marine
http://hphotos-snc3.fbcdn.net/hs086...._4081613_n.jpg

thats very interesting, so what do us non i-c guys do when we wanna run really big injectors swap pistons or run the 145* injectors??

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looks like we would need different rods too

You don't need different rods, the only difference is in the pin.

can you gain more power on an intercooled truck by putting an intercooled head with the larger injectors on it? or is it a waste of time. ive always been curious how that works

Do you mean gain power from putting an intercooled head on a non-intercooled engine?

ya or even vice versa? since the injectors are bigger in the non intercooled trucks, could you put that head on an intercooled truck and flow more through the non intercooled injectors since theyre bigger?

i dont know if it works or not just a thought ive wondered i dont know squat about the physics of an injector

I would stick with the 7mm head, the swirl design on the ports is superior. You could make more hp using a non I/C injector however since the hone size is larger.