Stock injectors on 383?
Stock injectors on 383? Hey guys I just bought a 383 stroker that was setup for boost and came with 95LB injectors on it and I am looking at running it without boost for a couple years, so my question is can I run it with my stock injectors? Below are the details on the motor:
https://ls1tech.com/forums/parts-cla...oker-sold.html
Here are the engine details
- 9:1 compression
- Custom Comp Cam
- Comp R lifters
- Speed Pro Hell-Fire rings
- Clevite bearings
- JE pistons
- Callies rods
- Lunati crank
- ProGram main caps
- Cloyes timing chain
- Comp retainers, keepers, and springs
- Heads are stock. Ported with 2.02/1.60 valves.
- Converted to 4-bolt main with ARP studs
- Precision Turbo 95 lb injectors
- MSD opti-spark
- Meizere electric water pump
https://ls1tech.com/forums/parts-cla...oker-sold.html
Here are the engine details
- 9:1 compression
- Custom Comp Cam
- Comp R lifters
- Speed Pro Hell-Fire rings
- Clevite bearings
- JE pistons
- Callies rods
- Lunati crank
- ProGram main caps
- Cloyes timing chain
- Comp retainers, keepers, and springs
- Heads are stock. Ported with 2.02/1.60 valves.
- Converted to 4-bolt main with ARP studs
- Precision Turbo 95 lb injectors
- MSD opti-spark
- Meizere electric water pump
I am currently running Bosch 36lb (more like 34lb in real life) on my 383 but my cam and heads move much more air. I am approaching their limit with a hydraulic roller. I say the 36s minimum. You might be able to get away with the 30s but it all depends on how good the head work was... still leaves no headroom.
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Huh? Any change of injector requires a retune. If the 95lb injector is any good and the tuner is competent then it should run fine. However, the idle quality of a bigger injector is generally less but it varies.
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Verdad Gallardo Sorry for the confusion. I meant to say the motor currently has a set of 95lb injectors on it. Since I am not running boost I was assuming I could not run it with the 95lb injectors. I still need to get the motor installed in my car and get it tuned so I am trying to figure out everything before I install it. So you are saying I should be able to run it with the 95lb injectors with a good tune?
I ran 30# svo injectors in a h/c 383 with zero issues 230/242 cam. Also had the same injectors with bolt ons and a 180 dry shot again with no problems. I've seen people run stock injectors on h/c before with no issues (h/c 220s duration ls1 locally that comes mind). From my experience and what I've seen you should be fine with 30lb injectors and might even be good with stockers (though this will depend on the condition of your injectors). A poor condition stock injector will not flow like a fully functional one.
30's is the MAX you would need for a 218/224 cam. I don't care if it's a stroker or not.
24's (stock) will likely do, but unless you have a verified good set on hand, just go with 30's.
100% duty cycle on a datalogger doesn't mean the injectors' fuel flow is at its limit. This subject has been hashed to death already.
24's (stock) will likely do, but unless you have a verified good set on hand, just go with 30's.
100% duty cycle on a datalogger doesn't mean the injectors' fuel flow is at its limit. This subject has been hashed to death already.
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Joined: Dec 2010
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From: Maricopa, AZ
I have no idea what the duty cycle was on the injectors, but I do know that the A/F mix didn't lean out at the top of the RPM range.....6300 RPMs or so.
Also.....my injectors were still new(ish), being just a year old.
That being said.....if this were my 383, I'd be going with 30LB (SVO?) injectors.....like the ones that were on my last 383ci
.Jus' sayin'.....
BTW, OP.....I still have those injectors. I'm about to have them refurbished and then I'm putting them up for sale......in case you'd be interested.
KW
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Joined: Dec 2010
Posts: 2,610
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From: Maricopa, AZ
Back in the old days (1997) I had stock 24LB injectors in my '96 Impala that had a hot-cam'ed 396ci. Car ran/idled great and pulled like a beast at the top end.
I have no idea what the duty cycle was on the injectors, but I do know that the A/F mix didn't lean out at the top of the RPM range.....6300 RPMs or so.
Also.....my injectors were still new(ish), being just a year old.
That being said.....if this were my 383, I'd be going with 30LB (SVO?) injectors.....like the ones that were on my last 383ci .
Jus' sayin'.....
BTW, OP.....I still have those injectors. I'm about to have them refurbished and then I'm putting them up for sale......in case you'd be interested.
KW
I have no idea what the duty cycle was on the injectors, but I do know that the A/F mix didn't lean out at the top of the RPM range.....6300 RPMs or so.
Also.....my injectors were still new(ish), being just a year old.
That being said.....if this were my 383, I'd be going with 30LB (SVO?) injectors.....like the ones that were on my last 383ci
.Jus' sayin'.....
BTW, OP.....I still have those injectors. I'm about to have them refurbished and then I'm putting them up for sale......in case you'd be interested.
KW
I can also do the math that shows 24lb injectors wouldn't work for my 355, nor would 30s, at my current VE and AFRs.
But, that doesn't answer my question.
TECH Addict
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
As to my question that you quoted. Look at what I quoted when I asked it, you'll understand my question and how you didn't answer it. How is 100% IDC not max flow?
hrc,
I'm sure you've seen these discussions before.
All I can say is direct experience shows there's something wrong with the "math" or reasoning.
Here's what I know: You can wideband tune, have the calculated duty cycle on Datamaster showing 100%, make fueling adjustments and watch the wideband go richer. All of the people getting the most power out of their setups have known this for a decade or two. SVO 30's support 600+ fwhp on NA setups just fine. And I've yet to see one of those fail in extended high power running. Two of us have been running open track events for with SVO 30's on 525 - 550 fwhp setups for 2 years and 10 years respectively. No failures in all those years on the same injectors.
Check out what the fast guys in NHRA/IHRA stockers are doing with small injectors that popular "math" says doesn't work. One of those guys, Gizmo, on this forum can attest to that.
I'm sure you've seen these discussions before.
All I can say is direct experience shows there's something wrong with the "math" or reasoning.
Here's what I know: You can wideband tune, have the calculated duty cycle on Datamaster showing 100%, make fueling adjustments and watch the wideband go richer. All of the people getting the most power out of their setups have known this for a decade or two. SVO 30's support 600+ fwhp on NA setups just fine. And I've yet to see one of those fail in extended high power running. Two of us have been running open track events for with SVO 30's on 525 - 550 fwhp setups for 2 years and 10 years respectively. No failures in all those years on the same injectors.
Check out what the fast guys in NHRA/IHRA stockers are doing with small injectors that popular "math" says doesn't work. One of those guys, Gizmo, on this forum can attest to that.