range of spark plug gap
04-29-2010, 01:51 PM
#1
range of spark plug gap
i know the OEM is
Standard (New): 1.0 1.1mm (0.039 - 0.043 in.)
Service Limit: 1.3mm (0.051in)
i am just wondering what you all tend to use ?
and have any of you ever experimented with diff gaps on the stock plugs ?
and i know your not suppose to adjust them, but jjust check, i am just wondering !
Standard (New): 1.0 1.1mm (0.039 - 0.043 in.)
Service Limit: 1.3mm (0.051in)
i am just wondering what you all tend to use ?
and have any of you ever experimented with diff gaps on the stock plugs ?
and i know your not suppose to adjust them, but jjust check, i am just wondering !
04-29-2010, 01:55 PM
#2
if you are going to put them in and leave them there for 100k miles without checking them (don't do this) then you might as well start on the low end of the spec, if you aren't using pre-gapped plugs. They will open up over time and will be pretty large by the end of service.
I put mine in at .043mm recently, I plan on checking the plugs once a year and at least once every two years. The larger gap within the spec. will get you the best performance IMO. There won't be a huge difference either way but youll get the best results from .043. My factory plugs opened up to over .051" within 55k miles so they were out of spec before the rated mileage.
I put mine in at .043mm recently, I plan on checking the plugs once a year and at least once every two years. The larger gap within the spec. will get you the best performance IMO. There won't be a huge difference either way but youll get the best results from .043. My factory plugs opened up to over .051" within 55k miles so they were out of spec before the rated mileage.
04-29-2010, 02:27 PM
#3
Originally Posted by JFUSION,Apr 29 2010, 01:55 PM
if you are going to put them in and leave them there for 100k miles without checking them (don't do this) then you might as well start on the low end of the spec, if you aren't using pre-gapped plugs. They will open up over time and will be pretty large by the end of service.
I put mine in at .043mm recently, I plan on checking the plugs once a year and at least once every two years. The larger gap within the spec. will get you the best performance IMO. There won't be a huge difference either way but youll get the best results from .043. My factory plugs opened up to over .051" within 55k miles so they were out of spec before the rated mileage.
I put mine in at .043mm recently, I plan on checking the plugs once a year and at least once every two years. The larger gap within the spec. will get you the best performance IMO. There won't be a huge difference either way but youll get the best results from .043. My factory plugs opened up to over .051" within 55k miles so they were out of spec before the rated mileage.
why do you say 0.043 is the best ?
04-29-2010, 05:04 PM
#5
generally speaking you run the largest gap possible without experiencing misfire or blowout and you will maximize hp and fuel economy. This applies to boosted setups as well as naturally aspirated. As long as you aren't experiencing firing problems (i.e. the spark is able to jump the gap) you will burn a higher percentage of air fuel mixture and it will burn quicker with a larger gap. When you are talking about the factory spec. range on a relatively stock naturally aspirated motor the .043" will get you better performance. The s2000 motor has absolutely no issues running .043", so you might as well run it to the higher end of the spec.
On my 04 Dodge SRT4 it came from the factory with gaps of .054" running about 12 psi boost, that was a pretty high gap for a boosted engine, and it worked.
On my 04 Dodge SRT4 it came from the factory with gaps of .054" running about 12 psi boost, that was a pretty high gap for a boosted engine, and it worked.
04-29-2010, 05:47 PM
#6
Originally Posted by JFUSION,Apr 29 2010, 05:04 PM
generally speaking you run the largest gap possible without experiencing misfire or blowout and you will maximize hp and fuel economy. This applies to boosted setups as well as naturally aspirated. As long as you aren't experiencing firing problems (i.e. the spark is able to jump the gap) you will burn a higher percentage of air fuel mixture and it will burn quicker with a larger gap. When you are talking about the factory spec. range on a relatively stock naturally aspirated motor the .043" will get you better performance. The s2000 motor has absolutely no issues running .043", so you might as well run it to the higher end of the spec.
On my 04 Dodge SRT4 it came from the factory with gaps of .054" running about 12 psi boost, that was a pretty high gap for a boosted engine, and it worked.
On my 04 Dodge SRT4 it came from the factory with gaps of .054" running about 12 psi boost, that was a pretty high gap for a boosted engine, and it worked.
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04-30-2010, 05:01 AM
#9
Registered User
I run NGK copper plugs in all my cars.For my stock 03S,I run either BKR7E or BKR6E.Gap @044.Adjust the heat range +/- 1 range depending on how the car is driven and how the plugs look.
I check plugs every OCI and usually change them every 10k.Copper plugs are about $2ea and since it takes less than 30 min to change all....why not.
With a smaller gap,you will get VERY SLIGHTLY better perf & worse econ.Larger gaps are the opposite.
As always,IMO.
\rlr
I check plugs every OCI and usually change them every 10k.Copper plugs are about $2ea and since it takes less than 30 min to change all....why not.
With a smaller gap,you will get VERY SLIGHTLY better perf & worse econ.Larger gaps are the opposite.
As always,IMO.
\rlr
04-30-2010, 07:29 AM
#10
Originally Posted by crank,Apr 29 2010, 09:47 PM
what gapper do you have ? i bought one today at advanced auto and it dosent have 0.043