sohc boosted owners! spark plug question
#1
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sohc boosted owners! spark plug question
Hey guys, I've been running my stock plugs & stock gap for some time now but i think it's time to upgrade the plugs, or at least replace them. The thing is, i've read and heard sooooo many different opinions on what i should get and what i should do (from this site, from other sites, from conversations, etc...)
I have a 98 Civic EX with the stock sohc motor (stock internals)
92-95 greddy sohc turbo kit w/ IC running 5psi (am going to up to 7psi)
RC 270cc injectors / upgraded fuel pump
V-AFC
MSD6BTM & blaster cap & coil
stock fpr (soon to be a B&M fpr to lower idle fuel pressure)
anyway, i've heard everything from getting stock plugs, to getting 2 steps colder, etc...
Car hardware
replace the oil inlet at the top of the turbo with a good EARL'S or AEROQUIP fitting!!!
The other issue is you probably have is the plugs gap them around .032 or .034 use 2 steps colder
I do know for sure that I should be using ZFRxF (for sohc) instead of BKRxE (for dohc). The question is, is the amount of boost i'm running (max 7psi) enough to need 1 step colder let alone 2 steps colder? I was honestly just going to put in NGK-ZFR6F and gap them to .035, but is that even necessary. like i said, i've been running the stock plugs (which i think are NGK-ZFR5F-11) without a lot of problems for several months.
also, if i do go colder with a smaller gap, do i need to retune the VAFC? is it going to make any difference?
thanks all and sorry so long!
I have a 98 Civic EX with the stock sohc motor (stock internals)
92-95 greddy sohc turbo kit w/ IC running 5psi (am going to up to 7psi)
RC 270cc injectors / upgraded fuel pump
V-AFC
MSD6BTM & blaster cap & coil
stock fpr (soon to be a B&M fpr to lower idle fuel pressure)
anyway, i've heard everything from getting stock plugs, to getting 2 steps colder, etc...
Car hardware
replace the oil inlet at the top of the turbo with a good EARL'S or AEROQUIP fitting!!!
The other issue is you probably have is the plugs gap them around .032 or .034 use 2 steps colder
I do know for sure that I should be using ZFRxF (for sohc) instead of BKRxE (for dohc). The question is, is the amount of boost i'm running (max 7psi) enough to need 1 step colder let alone 2 steps colder? I was honestly just going to put in NGK-ZFR6F and gap them to .035, but is that even necessary. like i said, i've been running the stock plugs (which i think are NGK-ZFR5F-11) without a lot of problems for several months.
also, if i do go colder with a smaller gap, do i need to retune the VAFC? is it going to make any difference?
thanks all and sorry so long!
#2
Honda-Tech Member
Re: sohc boosted owners! spark plug question (brcivic411)
Whenever you're introducing compressed air (and it's inherited heat), I think it VERY wise to run a little "insurance" with colder plugs. I was using BCPR6E-11's when I first got turbo'd. Good for what I was usuing (5-7psi), now at 10psi, I use BCPR7E-11's and run fine. Me personally, i'd play it safe and go at least one step colder..
#7
Re: sohc boosted owners! spark plug question (VTC_CiViC)
My NGK 7 series are on the way! I will gap em down to .34 so they will be all set to pop in when I install the turbo!
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#8
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Re: sohc boosted owners! spark plug question (97CivicFerio)
I ran my kit for a month at 5.5 psi with stock plugs, BCPR5ES, and they burned
perfectly but that might be risky depending on the air/fuel ratio you are getting,
octane rating, etc. Mine was running a little on the rich side.
I changed the plugs to BCPR7ES's and gapped them to .34. At 5.5 psi, my plugs fouled a lot quicker. Solution, turn up the boost, At 7-8 psi, the car runs great and the plugs look good too.
BTW, that post on ClubSi regarding BKRs and ZFRs http://forums.clubsi.com/ubb/Forum12/HTML/009866.html does not have anything to do with our SOHC's. They were referring to the bogus advice people were giving for quite a while to other DOHCers to use ZFR plugs. Some people there were also recommending ZFR's to SOHCers, which is wrong too. Use BCPR plugs.
[Modified by turbod97ex, 4:27 PM 1/17/2002]
perfectly but that might be risky depending on the air/fuel ratio you are getting,
octane rating, etc. Mine was running a little on the rich side.
I changed the plugs to BCPR7ES's and gapped them to .34. At 5.5 psi, my plugs fouled a lot quicker. Solution, turn up the boost, At 7-8 psi, the car runs great and the plugs look good too.
BTW, that post on ClubSi regarding BKRs and ZFRs http://forums.clubsi.com/ubb/Forum12/HTML/009866.html does not have anything to do with our SOHC's. They were referring to the bogus advice people were giving for quite a while to other DOHCers to use ZFR plugs. Some people there were also recommending ZFR's to SOHCers, which is wrong too. Use BCPR plugs.
[Modified by turbod97ex, 4:27 PM 1/17/2002]
#9
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Re: sohc boosted owners! spark plug question (turbod97ex)
with stock plugs regapped to .030", I gained almost 4 whp and 5 ft. lbs of torque!
once I did that, it didn't hesitate as much at low rpm's.
later,
aj
once I did that, it didn't hesitate as much at low rpm's.
later,
aj
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Re: sohc boosted owners! spark plug question (turbod97ex)
I changed the plugs to BCPR7ES's and gapped them to .34. At 5.5 psi, my plugs fouled a lot quicker. Solution, turn up the boost, At 7-8 psi, the car runs great and the plugs look good too.
BTW, that post on ClubSi regarding BKRs and ZFRs http://forums.clubsi.com/ubb/Forum12/HTML/009866.html does not have anything to do with our SOHC's. They were referring to the bogus advice people were giving for quite a while to other DOHCers to use ZFR plugs. Some people there were also recommending ZFR's to SOHCers, which is wrong too. Use BCPR plugs.
[Modified by turbod97ex, 4:27 PM 1/17/2002]
BTW, that post on ClubSi regarding BKRs and ZFRs http://forums.clubsi.com/ubb/Forum12/HTML/009866.html does not have anything to do with our SOHC's. They were referring to the bogus advice people were giving for quite a while to other DOHCers to use ZFR plugs. Some people there were also recommending ZFR's to SOHCers, which is wrong too. Use BCPR plugs.
[Modified by turbod97ex, 4:27 PM 1/17/2002]
Finally, where can I get these plugs online?
Thanks,
bryan
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Re: sohc boosted owners! spark plug question (ajn)
with stock plugs regapped to .030", I gained almost 4 whp and 5 ft. lbs of torque!
#13
Re: sohc boosted owners! spark plug question (brcivic411)
Nippon Power sells the BKR7E for the 92-2000 Civic DX, EX. Is this not correct? I ordered a set of them, thinking they were 2 stage colder plugs.
#14
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Re: sohc boosted owners! spark plug question (97CivicFerio)
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Re: sohc boosted owners! spark plug question (VTC_CiViC)
i went to clubplug.net to look @ some BCPR7Es.. but I have a question. What's the difference between:
BCPR7E
BCPR7ES
BCPR7ET (expensive)
BCPR7EY
BCPR7EY-N
BCPR7E
BCPR7ES
BCPR7ET (expensive)
BCPR7EY
BCPR7EY-N
#16
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Re: sohc boosted owners! spark plug question (brcivic411)
Not the slightest idea... I just went with the ones the guys who installed my turbo used which was the BCPR6E, except I went an extra step colder and got the 7. If anybody else knows what those different plugs are, I'd like to know as well..
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Re: sohc boosted owners! spark plug question (VTC_CiViC)
Go to this link http://www.ngksparkplugs.com/techinf...tnumberkey.pdf and check out the differnt part number definitions.
Bryan, I use the BCPR's because it is the one the shop I bought my turbo kit from said to use. I compared it to my stock plugs I replaced them with and they were very similar.
Bryan, I use the BCPR's because it is the one the shop I bought my turbo kit from said to use. I compared it to my stock plugs I replaced them with and they were very similar.
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Re: sohc boosted owners! spark plug question (turbod97ex)
What are you boosting now AJ?
I just made my $5 boost controller yesterday and it looks like I am running 7.5 lbs of boost. It pulls real hard and there is huge difference between 5.5 psi and 7.5 psi. I hope to get the car dynoed soon. I am trying to get a group of guys together so we can rent the space up at Extreme Motorsports for the day.
later,
aj
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Re: sohc boosted owners! spark plug question (brcivic411)
hey man i use these spark plugs on both of my rides BCPR6EY and gap them to .038
these spark plugs are from an 86-89 integra and they work great...i use OEM ignition wires, distributor cap and rotor. i believe honda ignition is great and enought to handle all the firings i need to blow the rest of you guys away.....
[Modified by jjgotboost, 11:20 PM 1/19/2002]
these spark plugs are from an 86-89 integra and they work great...i use OEM ignition wires, distributor cap and rotor. i believe honda ignition is great and enought to handle all the firings i need to blow the rest of you guys away.....
[Modified by jjgotboost, 11:20 PM 1/19/2002]
#20
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Re: sohc boosted owners! spark plug question (jjgotboost)
i am running JRSC on a mini-me controlled by zdyne gold ecu
currently 12psi ansd was having ignition cross-fire from5500-6300
tried several plugs and gap combos but the only thing
to cure this was installing ZEX spark plugs....no more problems
currently 12psi ansd was having ignition cross-fire from5500-6300
tried several plugs and gap combos but the only thing
to cure this was installing ZEX spark plugs....no more problems
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