Spark plugs
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Spark plugs
I read some where on the net that if you take the normal gap of the spark plug, say .35 and put it to like .45 or .50 that your gas mileage will actually go up. Does ANYONE have any information on this? I do a lot of driving and would like to pick up a few miles per gallon if it is possible. Thanks.
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I have heard nothing good from gapping platinum plugs. I just replaced my old NGKs with Bosch Platinums and the car gets a few more miles to the gallon. As pain in the butt as it is to change out the plugs, I would recommend against playing with the gap.
caught the z fever
Joined: Jun 2004
Posts: 2,518
From: Lafayette, IN
a wide spark plug gap can cause hard cold starting, misfires during rich or lean fuel conditions, and reduction of upper rpm range, and will reduce its lifespan. to keep a good spark within a wider rpm range you should run a narrower spark plug gap.
Registered User
Joined: Nov 2003
Posts: 3,672
From: Gerber, CA
The NGK PFR 6b-11's come pre-gapped at .045". With the ASH ECU, they recommend you gap it to .035". Other than that, I haven't read about increasing the gap to increase fuel mileage. You could bump your timing a up a couple degrees; which would give you small gains in mileage. I wouldn't go over 17 degrees of advance. Again, with the ASH ECU, they advise 15 degress, no more, no less. You can bump the timing up on a stock Z, or virtually stock Z.
Registered User
Joined: Jan 2005
Posts: 19
From: Richmond, Va
Originally Posted by 91NAZ
I have heard nothing good from gapping platinum plugs. I just replaced my old NGKs with Bosch Platinums and the car gets a few more miles to the gallon. As pain in the butt as it is to change out the plugs, I would recommend against playing with the gap.
how did the Bosch work, because i wanted to install the +4's on my car just because good advertisement i guess... but i think my spark plugs are starting to wear out and need to be replaced.
Registered User
Joined: Nov 2003
Posts: 3,672
From: Gerber, CA
The OEM NGK plugs have been proven to outperform and non-OEM cometition becuase they thread further into the head; which pushes the plug further inside the combustion chamber, thus creating more complete combustion. Stick with NGK.
Administrative Brown Guy
Joined: Jun 2003
Posts: 5,406
From: Ontario, Canada
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