marine intake injector size
- Thread starter 4.8t
- Start date
UR50SLO
V6+2=LSXCamaro
Re: marine intake injector size
Hey.. how's it going...
The Marine stock injectors are 24lb/hrs... (your stock intake injectors are 23.1lbhr.
The fuel pressure is higher on the Marine intake FPR.
If your not planning on using HPTuners to program the ECM for those or larger injectors then plan on
Getting a AFPR and dropping the Fuel Pressure till your regular scan tool reads with in 3-5 on the
STFT and LTFT's you'd be in the ball park for no programming. (Long/Short term fuel trims)
Send me a e-mail anytime.. be glad to help,
Scott.
UR50SLO@aol.com
Hey.. how's it going...
The Marine stock injectors are 24lb/hrs... (your stock intake injectors are 23.1lbhr.
The fuel pressure is higher on the Marine intake FPR.
If your not planning on using HPTuners to program the ECM for those or larger injectors then plan on
Getting a AFPR and dropping the Fuel Pressure till your regular scan tool reads with in 3-5 on the
STFT and LTFT's you'd be in the ball park for no programming. (Long/Short term fuel trims)
Send me a e-mail anytime.. be glad to help,
Scott.
UR50SLO@aol.com
UR50SLO
V6+2=LSXCamaro
Re: marine intake injector size
http://www.ecklers.com/product.asp?...ine+&+Related+-+Fuel+System+-+ALL-_-35855-_-X
There is a AFPR for the Marine intake fuel rail.
~Scott
http://www.ecklers.com/product.asp?...ine+&+Related+-+Fuel+System+-+ALL-_-35855-_-X
There is a AFPR for the Marine intake fuel rail.
~Scott
4.8t
New member
Re: marine intake injector size
thanks for the help. i'm tuning with hptuners. from what i have found so far is the marine intake fuel pressure is 58-60 like the stock pressure on his truck. but his 23.1 lbhr rating is actually at 58-60psi where as the marine injector rating is at 43.5psi. so with alittle math (hptuners conversion tool) i set it to 28.19.
motor still won't start. i think when the guy put in the dizzy he may have had the crank on the exhaust stroke instead of the compression stroke. i'm gonna go now and try going 180 out on it. it was making the boing sound they make when the spark fires at bottom dead center instead of tdc.
Thanks again,
Mike
thanks for the help. i'm tuning with hptuners. from what i have found so far is the marine intake fuel pressure is 58-60 like the stock pressure on his truck. but his 23.1 lbhr rating is actually at 58-60psi where as the marine injector rating is at 43.5psi. so with alittle math (hptuners conversion tool) i set it to 28.19.
motor still won't start. i think when the guy put in the dizzy he may have had the crank on the exhaust stroke instead of the compression stroke. i'm gonna go now and try going 180 out on it. it was making the boing sound they make when the spark fires at bottom dead center instead of tdc.
Thanks again,
Mike
UR50SLO
V6+2=LSXCamaro
Re: marine intake injector size
It'll run with the stock perameter's in it... that's not a huge worry.
Sounds like your on the right track why it won't start.
Got the injectors wired up right? I've got the schematic for that if you need it.
When you do the first fire up... let it go into closed loop. You'll see the the HPTuners scanner
where your LTFT/STFT's are and then you can go back in and adjust your fuel injector size accordingly
to where the trims are.
If it's subtracting fuel.... (Negitive fuel trim) Increase your injector size (shorten your pulse width)
If it's adding fuel (Positive fuel trim) Decrease your injector size (longer fuel pulse)
Till your in the 1-4 range.
Let me know if you need that injector wire schematic.
~Scott
It'll run with the stock perameter's in it... that's not a huge worry.
Sounds like your on the right track why it won't start.
Got the injectors wired up right? I've got the schematic for that if you need it.
When you do the first fire up... let it go into closed loop. You'll see the the HPTuners scanner
where your LTFT/STFT's are and then you can go back in and adjust your fuel injector size accordingly
to where the trims are.
If it's subtracting fuel.... (Negitive fuel trim) Increase your injector size (shorten your pulse width)
If it's adding fuel (Positive fuel trim) Decrease your injector size (longer fuel pulse)
Till your in the 1-4 range.
Let me know if you need that injector wire schematic.
~Scott
4.8t
New member
Re: marine intake injector size
well i got it to fire. it was 180 out. i'm pretty sure i got the right fuel numbers in there now. but i have to figure out why it is running like crap. it stumbles really bad when you rev it and it responds real slow to throttle. when at idle it has a bad stumble also. i got a crank position sensor code. i unpluged it and plug it back in and it ran great. then i finished putting everything back together and fired it up and it ran like crap again. i messed with the sensor again and it did nothing for it. my buddy said his cam position sensor caused the same thing.
i know the throttle position sensor is good as it would register perfectly with hptuners.
any ideas?
well i got it to fire. it was 180 out. i'm pretty sure i got the right fuel numbers in there now. but i have to figure out why it is running like crap. it stumbles really bad when you rev it and it responds real slow to throttle. when at idle it has a bad stumble also. i got a crank position sensor code. i unpluged it and plug it back in and it ran great. then i finished putting everything back together and fired it up and it ran like crap again. i messed with the sensor again and it did nothing for it. my buddy said his cam position sensor caused the same thing.
i know the throttle position sensor is good as it would register perfectly with hptuners.
any ideas?
UR50SLO
V6+2=LSXCamaro
Re: marine intake injector size
What are the LTFT and STFT?
Any other codes?
I know there is a tab on the dist. that keeps you from putting it in the wrong position (timing wise)
But you could still be 1 tooth off and it'd run.
Tap the engine over with the #1 plug out. Finger over hole. To find TDC. (Line up timing mark on ballancer to cover) by hand once close.
Take the dist. cap back off and verify that it's actually on #1. With a crank sensor code and
the poor running... I'll bet your close on the dist. but one tooh off causing it to be very retarded in timing.
Remember that cap is the spider one... Follow the hump on the top to get to the actuall #1 post.
Once that is solved you can do the LTFT/STFT and your driving!
Call me if you need to.
(Phone number in vendors section) Scott's paint and Performance.
What are the LTFT and STFT?
Any other codes?
I know there is a tab on the dist. that keeps you from putting it in the wrong position (timing wise)
But you could still be 1 tooth off and it'd run.
Tap the engine over with the #1 plug out. Finger over hole. To find TDC. (Line up timing mark on ballancer to cover) by hand once close.
Take the dist. cap back off and verify that it's actually on #1. With a crank sensor code and
the poor running... I'll bet your close on the dist. but one tooh off causing it to be very retarded in timing.
Remember that cap is the spider one... Follow the hump on the top to get to the actuall #1 post.
Once that is solved you can do the LTFT/STFT and your driving!
Call me if you need to.
(Phone number in vendors section) Scott's paint and Performance.
4.8t
New member
Re: marine intake injector size
the trims are alittle off but it can't be assumed its just the injectors. we installed a nice cam also. i'm going to try the crank sensor and cam sensor. i checked the dizzy 3 times last night. the rotor bug tab points directly over the rotor tab. if i go one tooth either way it goes way off.
the trims are alittle off but it can't be assumed its just the injectors. we installed a nice cam also. i'm going to try the crank sensor and cam sensor. i checked the dizzy 3 times last night. the rotor bug tab points directly over the rotor tab. if i go one tooth either way it goes way off.
UR50SLO
V6+2=LSXCamaro
Re: marine intake injector size
Sound good if you've got the rotor in the right spot...
Did that 3 bump crank wheel get re-installed?
Are you sure you got the timing chain on right? Depending on the brand and how many key ways it has I've seen a ton of guys install it wrong by accident.
Local guy had it 3 teeth off and the GN still ran... (17.80's) ... But ran and drove.
I tracked it down to a improper ground cam or installed wrong.. The cam had one lobe starting to wear so I put a new cam in with the timing chain right and it went 12.60's next pass. DOH!
Anyway... How much is the long/short term fuel adding or subracting?
Get the codes cleared up... and let us know how it go's!
Check for vaccume leaks too!
~Scott.
Sound good if you've got the rotor in the right spot...
Did that 3 bump crank wheel get re-installed?
Are you sure you got the timing chain on right? Depending on the brand and how many key ways it has I've seen a ton of guys install it wrong by accident.
Local guy had it 3 teeth off and the GN still ran... (17.80's) ... But ran and drove.
I tracked it down to a improper ground cam or installed wrong.. The cam had one lobe starting to wear so I put a new cam in with the timing chain right and it went 12.60's next pass. DOH!
Anyway... How much is the long/short term fuel adding or subracting?
Get the codes cleared up... and let us know how it go's!
Check for vaccume leaks too!
~Scott.
supersports10
New member
Re: marine intake injector size
what cam brand, and part# did you install??
i put the biggest cam comp cams makes in one and chased my tail forever, finally advanced the cam timing 4 degrees, and BAM!!!! whole different truck!!!
what cam brand, and part# did you install??
i put the biggest cam comp cams makes in one and chased my tail forever, finally advanced the cam timing 4 degrees, and BAM!!!! whole different truck!!!
4.8t
New member
Re: marine intake injector size
224/224 525/525 on a 110lsa CCA-56-430-8 http://store.summitracing.com/partdetail.asp?part=CCA-56-430-8&autoview=sku
http://videos.streetfire.net/video/43L-with-bad-idle-part-2_206778.htm here is a vid. you can hear it deisel when it shuts off.
224/224 525/525 on a 110lsa CCA-56-430-8 http://store.summitracing.com/partdetail.asp?part=CCA-56-430-8&autoview=sku
http://videos.streetfire.net/video/43L-with-bad-idle-part-2_206778.htm here is a vid. you can hear it deisel when it shuts off.
UR50SLO
V6+2=LSXCamaro
Re: marine intake injector size
How are the valves adjusted? Did you put in a set of real screw in studs that you can adust the rocer arms or did you run the stock studs/rockers and bottom them out?
If you left the stock rockers/studs in there I have a feeling the adjustment depth with that lift of camshaft would keep the valves open.
I can't tell much from that video... I heard it kind of knock when shutting off.
Where are you from?
How are the valves adjusted? Did you put in a set of real screw in studs that you can adust the rocer arms or did you run the stock studs/rockers and bottom them out?
If you left the stock rockers/studs in there I have a feeling the adjustment depth with that lift of camshaft would keep the valves open.
I can't tell much from that video... I heard it kind of knock when shutting off.
Where are you from?
4.8t
New member
Re: marine intake injector size
we are runing stock rockers torqued to spec. we replaced the push rods with comp recommended hardened push rods. they are the length comp said to use. the rattle seems to be just from the motor shaking due to dieseling. the part i don't understand is i had this thing idleing perfect and reving great. this is why i think its the crank sensor. my buddy has one but for got to get it. i was busy test fitting a 383lsi into a 97 gmc fullsize.
i'm located in maryland right now.
we are runing stock rockers torqued to spec. we replaced the push rods with comp recommended hardened push rods. they are the length comp said to use. the rattle seems to be just from the motor shaking due to dieseling. the part i don't understand is i had this thing idleing perfect and reving great. this is why i think its the crank sensor. my buddy has one but for got to get it. i was busy test fitting a 383lsi into a 97 gmc fullsize.
i'm located in maryland right now.
UR50SLO
V6+2=LSXCamaro
Re: marine intake injector size
So you've driven with the stock intake on it? The engine had run fine up until the Marine intake was installed?
Just trying to track down problems... with out knowing the entire story I'm kinda guessing at problems
that I've ran across in the past.
~SCott
So you've driven with the stock intake on it? The engine had run fine up until the Marine intake was installed?
Just trying to track down problems... with out knowing the entire story I'm kinda guessing at problems
that I've ran across in the past.
~SCott
supersports10
New member
Re: marine intake injector size
bingo!!! valves are too tight, if you used the stock net lash rockers, and tightened them all the way down, they are hanging the valve open.
also the cam is most likely retarded 2-4 degrees.
bingo!!! valves are too tight, if you used the stock net lash rockers, and tightened them all the way down, they are hanging the valve open.
also the cam is most likely retarded 2-4 degrees.
4.8t
New member
Re: marine intake injector size
well, grab a cup of coffee and let me tell you a story :lol:
i'll try to make this short. the guy wanted to turbo his 4.3l and make alittle power. well that turned into hey lets shoot for 500-550whp. so we took out the motor and bought some eagle H-beam rods, forged blower sbc pistons (forgot name but they were recommended here on syty.net), and a comp cam. backed it all up with new bearings and rings. sent the block to shop where it got bored, honed new cam bearing installed, and cleaned up. then the rotating assy was balanced. while it was apart we sent the heads off and got them cleaned with new seals, 5 angle valve job, and port/polish. we new we needed better source of fueling so we got a new marine intake with all the stock trimings for $199.00 off ebay. so, we took all the parts and slowly with book in hand put it all together. also decided to get new plugs/wire/rotor bug/cap. wired up new injectors i tore the old intake apart so i could see what wires went where (i'm an electrician by trade) oh forgot he also got a new oil pump, water pump, and timing set while it was out. clutch and fly wheel are stock for now. he's looking into doing a LT1 T56 swap. should be easy enough its 5spd now.
so when turbo goes on we are useing a set of syty manifolds nodded to hold a t4 flange and he'll be runing a master power t70 turbo. at 15psi the 4.3l sits in the heart of the turbo map. intercooler is already installed lol. and there will be plenty off meth to go around not to mention semien 60 injectors for fuel. and a nice walbro pump to send fuel. can't think of anything i'm missing at the moment. i would like to dig more into that pcm swap for 2/3bar map also.
if i can get it to run right it will be a great fun build. hope i didn't leave anything out.
well, grab a cup of coffee and let me tell you a story :lol:
i'll try to make this short. the guy wanted to turbo his 4.3l and make alittle power. well that turned into hey lets shoot for 500-550whp. so we took out the motor and bought some eagle H-beam rods, forged blower sbc pistons (forgot name but they were recommended here on syty.net), and a comp cam. backed it all up with new bearings and rings. sent the block to shop where it got bored, honed new cam bearing installed, and cleaned up. then the rotating assy was balanced. while it was apart we sent the heads off and got them cleaned with new seals, 5 angle valve job, and port/polish. we new we needed better source of fueling so we got a new marine intake with all the stock trimings for $199.00 off ebay. so, we took all the parts and slowly with book in hand put it all together. also decided to get new plugs/wire/rotor bug/cap. wired up new injectors i tore the old intake apart so i could see what wires went where (i'm an electrician by trade) oh forgot he also got a new oil pump, water pump, and timing set while it was out. clutch and fly wheel are stock for now. he's looking into doing a LT1 T56 swap. should be easy enough its 5spd now.
so when turbo goes on we are useing a set of syty manifolds nodded to hold a t4 flange and he'll be runing a master power t70 turbo. at 15psi the 4.3l sits in the heart of the turbo map. intercooler is already installed lol. and there will be plenty off meth to go around not to mention semien 60 injectors for fuel. and a nice walbro pump to send fuel. can't think of anything i'm missing at the moment. i would like to dig more into that pcm swap for 2/3bar map also.
if i can get it to run right it will be a great fun build. hope i didn't leave anything out.
4.8t
New member
Re: marine intake injector size
valves too tight??????? i got correct length push rods and when fully tightened to spec and on compression stroke rocker arms can be slightly wiggled meaning there is no stress on rocker arm. there for valve not opened. why do you say most likely retarded. and if it was it seems it would just lope hard not miss. and when you rev it if it were retarded then in upper rpm it would smooth out.
valves too tight??????? i got correct length push rods and when fully tightened to spec and on compression stroke rocker arms can be slightly wiggled meaning there is no stress on rocker arm. there for valve not opened. why do you say most likely retarded. and if it was it seems it would just lope hard not miss. and when you rev it if it were retarded then in upper rpm it would smooth out.