Alright, I think it's time for new injectors.
I have 210,000 on the stock 215 injectors and now have to give it quite a bit of pedal to start - have a feeling they are coked up pretty good.

I've been reading quite a bit of positive reviews on these new 7 hole SAT style injectors.
My truck is a '98 12valve 5 speed with an 11 plate.
- Daily driver and occasionally tow a 3500# boat.
- Not looking for smoke.
- I am looking for a bit of a performance boost and being a daily driver any low-end improvement would be nice.

I'm looking at CPP's 7x.010 SAC injector
http://www.cumminsperformancefarts.c...pein12v7h.html

Am I on track here?
Is a SAC 7x.010 better than a traditional 5x.012 for my application?
Thoughts?

EDIT: Typo - intended to SAC, not SAT...Thanks Tate

 

Those are SAC nozzles, not SAT. Sac nozzles are typically hotter and smokier than VCO nozzles, but higher power potential. If you're not looking for a lot of power, I'd think a VCO nozzle would be the way to go.

I don't have any experience with 7-hole nozzles on a 12v, so I can't comment there.

 

Assuming the seven hole is the way to go...
Would the 7x.009 be a better choice than the 7x.010?

I don't intend to go crazy with mods but do plan on holding onto this motor for awhile. Just don't want to go too small and wish I had gone larger.

Just to add more confusion; should I be looking at DPP 50hp Stage I injectors?
What's the size if these? 5x???

It does seem quite a few reports have been very positive about the 7 hole injectors.
All if these are the correct spray pattern aren't they?

 

The DDP's would be somewhere in the 5x.010" range. The 90's are 5x.012, the 140s' are 5x.014. The 7x10's should still be fairly healthy sized injectors. I have 7x12's in my 24v, and SDX rates them around a 240hp injector. And those are VCO's. Sac's will be more yet.

 

CZSteve

(I am looking for a bit of a performance boost and being a daily driver any low-end improvement would be nice.)

If your looking for more take off power, why not put in a 3000 rpm governor spring?

 

For the starting issue, have you adjusted up the idle a little bit to see if that helps? the little nub that the throttle rests against to set idle gets worn down over time and your idle will gradually get lower, and there for slower to start. U should use a hand held tach to check actual engine RPM, dash tack is only so so.
my dodge has 303,000 mi on original inj, and no issues, not to say that you dont. Just something to look at.
Im not trying to talk you out of new injectors, just trying to help the hard start.

 

Im also looking at the 7x.009 CPP injectors. I think he uses a 158* nozzle (its a heck of a lot cheaper than making a custom one with the right 145* angle) though so if you run high timing that may be an issue. You might want to ask and make sure that works for your setup. Ive had some suspicions with mine, I think theyre 155*, not 100% sure.
I have DDPs 75hp injectors in there now and something is certainly wrong with them. I think theyre gunked up.. lots of haze and the fuel mileage has been awful for awhile.
Im also wondering if it might be worthwhile to make sure you dont have an air leak in the fuel return line. That would make it hard to start after it sits.

EDIT: just bought a set of 7x.010 injectors from CPP and asked to set them to 310bar in the hopes of getting some better fuel economy. Ill try to post back with results.
I asked about the spray angle, its not a problem with timing at 15-16* like Ive got.

 

Check the OFV pressure for hard start issue.
If the pressure isn't at least 20+ psi, then replace the OFV with one from TEC-Torq.
Don't use on that is not adjustable.


Tom

 

pressure is a hair over 20psi at idle. Sometimes its higher which makes me wonder if its the sender, a leak that closes with temperature, or the overflow on the way out.
I got a sight glass in front of the lift pump so I can see theres no air there. Still could be leaking on the return side.
Anyhow I ordered one of those overflow valves from torq-tec. Looks like good stuff. Thanks for the tip!

 

I have a set of 7*14's going into a 12V with 370 pistons. The spray angle is 152 deg's, should be around 240HP area. Its all about what injector shim you use and how much timing you run. Both have effects on the smoke level and power that available.

 

I run the .6mm shim and my timing probably wont go over 18* so I should be ok. The pop off pressure is supposed to be set a little high (if they remember to do it) which might push the timing numbers down just a little.

 

Mine are usually set at 280 bar, 310 bar sounds pretty high. As for a 152 deg spray angle, might be abit wide for a stock piston. 370 marine pistons allow for a wider spray angle. I typically use the 20thou washer on the injector, just to keep the nozzle/tip inside the bowl as much as you can.

 

Big delay getting these injectors, having second thoughts.
Might see if I can get someone to build me a set that arent too smokey
Assuming I stick with these I think I should be ok. Mike, I bet youre running a fair bit of timing, right? If I ran a .6mm shim with this 158* injector, Id imagine Id still be in the bowl at 16* timing. Anyone know for sure, or know how to find out?

 

Were you getting the 158deg nozzles from? A lot has to do with the piston bowl design. The 215 pistons have a small bowl. Lots of stuff effect timing.

 

Big thread on CF about these 7 hole nozzles. What seemed to come out was that they were most commonly made from a 158 degree denso nozzle. The 148 nozzles were harder to come by and more expensive.