LB7: SAC-style Injector Life
- Thread starter DAVe3283
- Start date
Is that what you put on all your injectors now or is that an option when ordering...
And unless I misread that is only available on oversize injectors
The Sac nozzles are an option and I believe they start at 45%
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Yes....... and rods :rofl: (im not letting that go as you can tell)
Haha.. Rods are on the next list. This list requires panty dropping and truck driving
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I'll do a update again in a couple weeks with data, but just going on how it seems subjectively, they seem to be holding up great. Unlike my SoCal heads...
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SAC injector update
Day 111 (3 months, 19 days)
Hours on injectors: 86.7
Miles on injectors: 3,794
Fuel injected: 236.6 gal
Miles on motor: 14,590
Miles on truck: 310,826
After some tweaks to the tuning, I now have my main rate at about 8mm3 at hot idle. Balance rates look fantastic still (except #2, more on that below), and no smoke or smell at idle. Injectors seem to be lasting great, but with only ~4k miles, that is to be expected, I suppose.
I did figure out why the balance rate for cylinder #2 is consistently high, though. I recently changed heads, and re-measured piston protursion. When my first set of [THREAD=63518]SoCal Stage 1 heads cracked and hydrolocked my engine[/THREAD], it appears to have shortened the #2 Carillo rod by about 0.006". So that explains that
As for mileage, it does appear that the SAC style injectors do a bit better. I would say a solid 1.0 to 1.2 MPG based on my records. Can't complain about that!
Day 111 (3 months, 19 days)
Hours on injectors: 86.7
Miles on injectors: 3,794
Fuel injected: 236.6 gal
Miles on motor: 14,590
Miles on truck: 310,826
Code:
Drive Park
BALRCYL1 -2.08 -1.40
BALRCYL2 +3.01 +2.19
BALRCYL3 -1.60 -0.82
BALRCYL4 -0.66 -0.56
BALRCYL5 +1.50 +1.19
BALRCYL6 -0.46 +0.04
BALRCYL7 +0.12 +0.00
BALRCYL8 -0.10 -0.21
MAINRATE 14.1mm3 8.4mm3I did figure out why the balance rate for cylinder #2 is consistently high, though. I recently changed heads, and re-measured piston protursion. When my first set of [THREAD=63518]SoCal Stage 1 heads cracked and hydrolocked my engine[/THREAD], it appears to have shortened the #2 Carillo rod by about 0.006". So that explains that
As for mileage, it does appear that the SAC style injectors do a bit better. I would say a solid 1.0 to 1.2 MPG based on my records. Can't complain about that!
Last edited:
I have a injector going out again on my lb7 and thinking when I order the next set I'll go ahead and get the SAC from LDS. I'll be calling in the morning Brent, had another truck show up today that needs injectors.
I put a decent amount of miles on this summer going camping and the like, but didn't record all the detailed diags yet. And since my heater core is leaking and I bypassed it, I haven't been driving my truck much this fall. If I take it out again soon, I'll get detailed stats.
For now, you'll have to make do with a subjective update. Since my last update in July, the truck has kept running great, with no indications the injectors are wearing out at all. Mileage is still excellent as well. From what I've seen so far, I wouldn't hesitate to put a 45% set of SAC injectors in.
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For now, you'll have to make do with a subjective update. Since my last update in July, the truck has kept running great, with no indications the injectors are wearing out at all. Mileage is still excellent as well. From what I've seen so far, I wouldn't hesitate to put a 45% set of SAC injectors in.
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Sub'd
Who else is running the sac style injectors? Dave how many miles do you have on them now? My lb7 is starting to haze again and I'm tired of only getting 25-40k miles on a set of injectors because this truck puts on 25k miles a year. I've already had to put 3 injectors in since February as they were pretty much hung open. Guess I'll be calling Brent sooner then I expected for a set of 45% SAC injectors.
Who else is running the sac style injectors? Dave how many miles do you have on them now? My lb7 is starting to haze again and I'm tired of only getting 25-40k miles on a set of injectors because this truck puts on 25k miles a year. I've already had to put 3 injectors in since February as they were pretty much hung open. Guess I'll be calling Brent sooner then I expected for a set of 45% SAC injectors.
Probably only 1000 or so miles since last time. Since I still don't have a heater (new core is sitting in the garage, I'm just busy/lazy) I only drive it when towing or hauling something. From what I can tell, the SAC injectors are still working perfect. I'll post a formal update next spring with the hours/miles/balance rates/etc once I have the heater core in and put some real miles on it. Or maybe sooner if I have the time.
Are these your 100 overs? My stock one's are hazing, i keep going back and forth on fixing it or going the lbz conversion route, but at least encouraging that there is some longevity on the sac's
Mine are just stock. Ya idk I have another spare lb7 engine here that needs HGs done and I'm thinking about studding it, going with LDS 45 sac styles, new HP lines and russels 63.5 ihi then when this motor goes just dropping that spare engine (150k miles compared to my 315k mile motor) in with the goodies.
I gotcha think I got it mixed up with your LLY, yeah im kinda thinking something similar if I stick with the lb7, but will need trans built... gonna get expensive