Spark gap for R-OH/H20 injection
Dec 20, 2005, 05:46 PM
#1
Evolved Member
Thread Starter
iTrader: (4)
Join Date: Sep 2003
Location: Kingdom of Saudi Arabia
Posts: 3,456
Likes: 0
Received 0 Likes
on
0 Posts
Spark gap for R-OH/H20 injection
Just wondering what spark gap you guys are running with your set-up. Also copper or iridiums. 
boost too.
boost too.
Dec 20, 2005, 05:54 PM
#2
Evolved Member
iTrader: (10)
Join Date: Jan 2003
Location: Yuma AZ
Posts: 942
Likes: 0
Received 0 Likes
on
0 Posts
I have my custom ignition thing (Switzer style) so my gap is .028.
Before I had it I had to run .022 to keep from high rpm miss at 23psi.
With my ignition set-up I experimented with gaps from .022 to .035.
I ran .035 for a month with no ill effects, except when I pulled the plugs they looked like they got really hot. I figured .028 was a good an in-between number.
I run NGK BPR7EIX irridiums.
I've tried Denso and stock.
I get no miss at 28psi, with WI at 10.9 afr. That's alot of crap for the spark to burn through.
Before I had it I had to run .022 to keep from high rpm miss at 23psi.
With my ignition set-up I experimented with gaps from .022 to .035.
I ran .035 for a month with no ill effects, except when I pulled the plugs they looked like they got really hot. I figured .028 was a good an in-between number.
I run NGK BPR7EIX irridiums.
I've tried Denso and stock.
I get no miss at 28psi, with WI at 10.9 afr. That's alot of crap for the spark to burn through.
Dec 20, 2005, 05:57 PM
#3
Evolved Member
Thread Starter
iTrader: (4)
Join Date: Sep 2003
Location: Kingdom of Saudi Arabia
Posts: 3,456
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by bishiboy
I have my custom ignition thing (Switzer style) so my gap is .028.
Before I had it I had to run .022 to keep from high rpm miss at 23psi.
With my ignition set-up I experimented with gaps from .022 to .035.
I ran .035 for a month with no ill effects, except when I pulled the plugs they looked like they got really hot. I figured .028 was a good an in-between number.
I run NGK BPR7EIX irridiums.
I've tried Denso and stock.
I get no miss at 28psi, with WI at 10.9 afr. That's alot of crap for the spark to burn through.
Before I had it I had to run .022 to keep from high rpm miss at 23psi.
With my ignition set-up I experimented with gaps from .022 to .035.
I ran .035 for a month with no ill effects, except when I pulled the plugs they looked like they got really hot. I figured .028 was a good an in-between number.
I run NGK BPR7EIX irridiums.
I've tried Denso and stock.
I get no miss at 28psi, with WI at 10.9 afr. That's alot of crap for the spark to burn through.
Dec 20, 2005, 06:02 PM
#4
Evolved Member
Thread Starter
iTrader: (4)
Join Date: Sep 2003
Location: Kingdom of Saudi Arabia
Posts: 3,456
Likes: 0
Received 0 Likes
on
0 Posts
Mine was at 0.027" on NGK Ir @23psi - 12.5afr.....misfires bad!
Now its @0.025" on NGK Ir with hks DLI II @23psi - 12.5afr, no misfires
Will crank up boost when i get retuned, will post results.
btw EGTs is in the high 800s
Now its @0.025" on NGK Ir with hks DLI II @23psi - 12.5afr, no misfires
Will crank up boost when i get retuned, will post results.
btw EGTs is in the high 800s
Dec 20, 2005, 06:09 PM
#5
I run a .022 gap on Denso IW22 Iridiums, but I still have the stock ignition. So far no mis-fires at any RPM range and I have a nice smooth idle. When I had my Crane box on my Talon AWD, I was able to run as much as a .028 gap without any misfires and I was injecting alot of water to suppress detonation. I was running BPR7ES's at a .022 gap on my Evo and they worked fine, but only at that gap. Otherwise, when I ran them at any larger gap I had a rough idle, kind of like a miss at idle and the overall performance just felt doggy.
Dec 20, 2005, 06:12 PM
#6
Evolved Member
Thread Starter
iTrader: (4)
Join Date: Sep 2003
Location: Kingdom of Saudi Arabia
Posts: 3,456
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by EvoTio
I run a .022 gap on Denso IW22 Iridiums, but I still have the stock ignition. So far no mis-fires at any RPM range and I have a nice smooth idle. When I had my Crane box on my Talon AWD, I was able to run as much as a .028 gap without any misfires and I was injecting alot of water to suppress detonation. I was running BPR7ES's at a .022 gap on my Evo and they worked fine, but only at that gap. Otherwise, when I ran them at any larger gap I had a rough idle, kind of like a miss at idle and the overall performance just felt doggy.
Dec 20, 2005, 07:20 PM
#7
interesting, I need to look into this. So far I have not noticed the need for a smaller gap. But I am interested in the findings people are posting.
I need to do some testing to determine how much I am spraying. It may be that I don't have enough water.
Slowcar, sorry I don't remember your setup. 12.5 afr @23 psi you must be pumping a lot of water. Have you tried moving the timing with a bit more fuel? With my set up I am running more than a point richer and maybe 10 degrees timing at the low point. I'd love to get a few more degrees. Not happening, maybe with more water. Running aquamist 2d, dds2, interfaced with my ecu. Waiting on the dds3 and new intercooler pipe to be delivered.
uh, sorry, can't read. I'm just on water.
I need to do some testing to determine how much I am spraying. It may be that I don't have enough water.
Slowcar, sorry I don't remember your setup. 12.5 afr @23 psi you must be pumping a lot of water. Have you tried moving the timing with a bit more fuel? With my set up I am running more than a point richer and maybe 10 degrees timing at the low point. I'd love to get a few more degrees. Not happening, maybe with more water. Running aquamist 2d, dds2, interfaced with my ecu. Waiting on the dds3 and new intercooler pipe to be delivered.
uh, sorry, can't read. I'm just on water.
Last edited by nothere; Dec 20, 2005 at 07:43 PM.
Trending Topics
Dec 21, 2005, 07:01 AM
#8
Evolved Member
Thread Starter
iTrader: (4)
Join Date: Sep 2003
Location: Kingdom of Saudi Arabia
Posts: 3,456
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by nothere
interesting, I need to look into this. So far I have not noticed the need for a smaller gap. But I am interested in the findings people are posting.
I need to do some testing to determine how much I am spraying. It may be that I don't have enough water.
Slowcar, sorry I don't remember your setup. 12.5 afr @23 psi you must be pumping a lot of water. Have you tried moving the timing with a bit more fuel? With my set up I am running more than a point richer and maybe 10 degrees timing at the low point. I'd love to get a few more degrees. Not happening, maybe with more water. Running aquamist 2d, dds2, interfaced with my ecu. Waiting on the dds3 and new intercooler pipe to be delivered.
uh, sorry, can't read. I'm just on water.
I need to do some testing to determine how much I am spraying. It may be that I don't have enough water.
Slowcar, sorry I don't remember your setup. 12.5 afr @23 psi you must be pumping a lot of water. Have you tried moving the timing with a bit more fuel? With my set up I am running more than a point richer and maybe 10 degrees timing at the low point. I'd love to get a few more degrees. Not happening, maybe with more water. Running aquamist 2d, dds2, interfaced with my ecu. Waiting on the dds3 and new intercooler pipe to be delivered.
uh, sorry, can't read. I'm just on water.
Getting reflashed in ~3 weeks
Dec 30, 2005, 05:36 PM
#9
Evolved Member
iTrader: (2)
Join Date: Oct 2002
Location: Somewhere
Posts: 1,328
Likes: 0
Received 0 Likes
on
0 Posts
Slowcar
what boost are you running at 10 timing ???????
I'm having a heck of a time trying to run 5 degree timing at 26psi .. obviously not helped by the fact that local weather averages 90degrees of so ..
I run progressive water injection at constant 10-15% water to fuel based on the fuel injector duty cycle ..
maybe I should just spray max water and see what happens
I leave mine at 0.4mm gap to keep in line with topic
Side note, anyone using wire type plugs?
what boost are you running at 10 timing ???????
I'm having a heck of a time trying to run 5 degree timing at 26psi .. obviously not helped by the fact that local weather averages 90degrees of so ..
I run progressive water injection at constant 10-15% water to fuel based on the fuel injector duty cycle ..
maybe I should just spray max water and see what happens
I leave mine at 0.4mm gap to keep in line with topic
Side note, anyone using wire type plugs?
Dec 30, 2005, 06:59 PM
#11
Evolved Member
Thread Starter
iTrader: (4)
Join Date: Sep 2003
Location: Kingdom of Saudi Arabia
Posts: 3,456
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by gunzo
Slowcar
what boost are you running at 10 timing ???????
I'm having a heck of a time trying to run 5 degree timing at 26psi .. obviously not helped by the fact that local weather averages 90degrees of so ..
I run progressive water injection at constant 10-15% water to fuel based on the fuel injector duty cycle ..
maybe I should just spray max water and see what happens
I leave mine at 0.4mm gap to keep in line with topic
Side note, anyone using wire type plugs?
what boost are you running at 10 timing ???????
I'm having a heck of a time trying to run 5 degree timing at 26psi .. obviously not helped by the fact that local weather averages 90degrees of so ..
I run progressive water injection at constant 10-15% water to fuel based on the fuel injector duty cycle ..
maybe I should just spray max water and see what happens
I leave mine at 0.4mm gap to keep in line with topic
Side note, anyone using wire type plugs?
0.4mm = 0.016"....thats a real small gap....
I will get retuned in a week on 91+water, this time, i'm not quitting till i see knock
Dec 30, 2005, 07:09 PM
#12
Evolved Member
iTrader: (2)
Join Date: Oct 2002
Location: Somewhere
Posts: 1,328
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by SlowCar
Hi Gunzo, 10 degrees at peak torque, ~23psig. The distribution of the water mist is important....how is your nozzle mounted, 1.0mm jet? ANd do you run the FiA2/HSV combo? U running straight water?
0.4mm = 0.016"....thats a real small gap....
I will get retuned in a week on 91+water, this time, i'm not quitting till i see knock
0.4mm = 0.016"....thats a real small gap....
I will get retuned in a week on 91+water, this time, i'm not quitting till i see knock
Straight water with MF2/HSV combo
Even with full 350cc/min flow rate @ 6500rpms .. I still see knock spikes around 1.5v or so .. maybe it's just a noisy engine ..
Think I'll go try 300cc/min flow at 4500rpms onwards .. now only flowing 100cc/min gradually increasing to 350cc at 6500rpms
NOTHERE
this type of plug .. not the crappy splitfire
Thread
Thread Starter
Forum
Replies
Last Post
Evoguy!123
Evo Engine / Turbo / Drivetrain
5
Jul 20, 2016 07:26 AM
Oracle1
Evo Engine / Turbo / Drivetrain
2
Mar 30, 2008 09:57 PM
