Spark plug gap + horsepower gain + better gas milage - SR20 Forum
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#1 (permalink) Old 05-02-2004, 05:56 PM
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Spark plug gap + horsepower gain + better gas milage

I have been using NGK BKR7E-11 gapped at .025 for quite sometime, I recently started experimenting with a larger gap, I am running a .040 gap now with the same plugs and the engine runs much much smoother and revs alot faster especially in the upper rpm's and the cars seems to come on to boost a tad bit quicker............I think next i'll try what the DET really calls which are platinums when I save some money and run the .044 gap. And my gas milage has gotten better since upping the gap to .040..........I went from 8.8 gallons given me 170 to 180mpg to today a best of 210mpg with 8.8 gallons. Anyone here every try this?
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#2 (permalink) Old 05-02-2004, 06:12 PM
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Re: Spark plug gap + horsepower gain + better gas milage

no, i will have to see how they will do at 0.040" at 20+psi and C16....
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#3 (permalink) Old 05-02-2004, 06:30 PM
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Re: Spark plug gap + horsepower gain + better gas milage

I was running the BKR7E's at .038" gap and all was fine until 17psi. I had to close then down to .035". I am running a MSD Digital 6 with a Blaster SS coil, but it has to cut through water molecules from my Aquamist water injection. Without the water turned on I am sure I would be able to run ~.040" gap at 17psi+.

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#4 (permalink) Old 05-02-2004, 06:43 PM
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Re: Spark plug gap + horsepower gain + better gas milage

well, we shall have to see how it does on mine, i dont have water injection.
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#5 (permalink) Old 05-02-2004, 06:50 PM
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Re: Spark plug gap + horsepower gain + better gas milage

Don't forget I only got a T25 at 9psi to, I am sure there is a point where .040 becomes to big but I also know alot of peeps with T25 running these super small gaps, I know personally I wouldn't run any smaller than .040 probably even .044 (just haven't tried that gap yet) with a T25 with or with out cams.
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#6 (permalink) Old 05-02-2004, 06:54 PM
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Re: Spark plug gap + horsepower gain + better gas milage

I'm running BKR6Es at .025 and my highway mileage is consistently around 30mpg.

Lew
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#7 (permalink) Old 05-02-2004, 07:06 PM
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Re: Spark plug gap + horsepower gain + better gas milage

I could use 30mpg with these damm gas prices, im getting there im up from 18-19 to around 23-24mpg now, I also replaced a cracked ingition coil and a bad MAF. I think my ECU is still adjusting fuel trim as my milage is getting better with each 8.8 gallons added.
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#8 (permalink) Old 05-02-2004, 07:12 PM
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Re: Spark plug gap + horsepower gain + better gas milage

How much are those plugs,I need some new ones

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#9 (permalink) Old 05-02-2004, 08:28 PM
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Re: Spark plug gap + horsepower gain + better gas milage

I ran .35 at 15psi on the t25 and it loved it. I notice alot of people run such tight gaps. I run it as loose as possible right before it starts to break up. I was running .40 but it would break up depending on the weather.

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#10 (permalink) Old 05-02-2004, 08:34 PM
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Re: Spark plug gap + horsepower gain + better gas milage

another thing of import:

i talked to mike kojima and jim wolfe a couple of months back, and they were saying that the platinum tipped plugs work a lot better. platinum may not conduct better, but under the nasty conditions of your combustion chamber, they last a lot longer. if you have a plug that is getting burned away, this is a great spot to start a hot spot, which leads to detonation.

so, point in case: run platinum, its mo bettah.
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#11 (permalink) Old 05-02-2004, 08:43 PM
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Re: Spark plug gap + horsepower gain + better gas milage

Quote:
Originally Posted by TREYDEE
How much are those plugs,I need some new ones
BKR6E are $1.66 ea. from Courtesy. They don't last like plats, but at that price you can change them pretty often.

Lew
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#12 (permalink) Old 05-02-2004, 11:22 PM
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Re: Spark plug gap + horsepower gain + better gas milage

Been running .35 for a long time now. Always read about don't go anymore than .28 or .30, you will detonate. Anyways, guess alot of people are starting to realize somethings aren't always true.

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#13 (permalink) Old 05-03-2004, 02:44 AM
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Re: Spark plug gap + horsepower gain + better gas milage

I've been running .028 on BKR7E's for about a month now, consistently getting 24-25mpg on 11psi on 93 or 94 octane. I'll try the .040 and see what happens.

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#14 (permalink) Old 05-03-2004, 08:52 AM
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Re: Spark plug gap + horsepower gain + better gas milage

I am running 42 gap on platinum 7e's, with no running problems. I have had them as high as .45, but I have also replaced the cap, rotor, plugs, and coil recently...Josh

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#15 (permalink) Old 05-03-2004, 10:26 AM
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Re: Spark plug gap + horsepower gain + better gas milage

Quote:
Originally Posted by oNeBaDaPpLe
Been running .35 for a long time now. Always read about don't go anymore than .28 or .30, you will detonate. Anyways, guess alot of people are starting to realize somethings aren't always true.
You won't get detonation, just misfire at high boost levels if the plug gap is too big.

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#16 (permalink) Old 05-03-2004, 11:03 AM
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Re: Spark plug gap + horsepower gain + better gas milage

I'm running 7E's at .35 I've got to try .40 if you say your Mileage has gotten better....

Allan

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#17 (permalink) Old 05-03-2004, 03:34 PM
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Re: Spark plug gap + horsepower gain + better gas milage

Quote:
Originally Posted by lshadoff
BKR6E are $1.66 ea. from Courtesy. They don't last like plats, but at that price you can change them pretty often.

Lew
yeah, but you have to make sure to check the electrode often, as the copper ones dont last as long. if youre really pushing it, is it worth a motor over $4 a spark plug?
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#18 (permalink) Old 05-03-2004, 03:59 PM
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Re: Spark plug gap + horsepower gain + better gas milage

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Originally Posted by HotshtSR20
yeah, but you have to make sure to check the electrode often, as the copper ones dont last as long. if youre really pushing it, is it worth a motor over $4 a spark plug?
THATS SO TRUE.

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#19 (permalink) Old 05-03-2004, 06:35 PM
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Re: Spark plug gap + horsepower gain + better gas milage

Quote:
Originally Posted by HotshtSR20
yeah, but you have to make sure to check the electrode often, as the copper ones dont last as long. if youre really pushing it, is it worth a motor over $4 a spark plug?
A worn spark plug won't hurt the engine. It will just develop a miss at high boost.

Now if they exploded when they were worn out, that would be different.

Lew
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#20 (permalink) Old 05-03-2004, 06:46 PM
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Re: Spark plug gap + horsepower gain + better gas milage

Quote:
Originally Posted by lshadoff
A worn spark plug won't hurt the engine. It will just develop a miss at high boost.

Now if they exploded when they were worn out, that would be different.

Lew
a worn spark plug is a good place for premature combustion to start. worn plugs form hot spots, which may lead to detonation. trust me, i used to be a huge advocate of "copper" plugs.

this is according to Jim and Clark, people who know more about engine management than 10 sr20forums combined.
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