OE Spark Plug Gap Range

Tractionless · 09-13-2018, 10:37 AM

The workshop manual reads 0.043 (standard) to 0.055 (max.).

In a non boosted application using OE or OE equivalent plugs; has anyone had positive results opening the gap more toward 0.055?

I like to hear from those with both negative and positive experiences and what your gap numbers are/were.

Thanks for your insight!

PS- The only info. I could find in search related to boosted applications.

SG4247 · 09-13-2018, 12:02 PM

I run the GTR plug at .031” on 93 gas and E85.

I know thats a tight gap, and it has worked well for me.

Natural of course.

lj909 · 09-13-2018, 02:38 PM

From what I've read. The higher the pressure, the smaller the gap. If your N/A open them up to get the biggest spark. If your boosted or running some sort of high comp engine or nitrous you need a smaller gap so the spark can make it across.

I personally opened all mine up (can't remember the exact #) made sure they were all the same. And I also got a index washer kit so that they were all pointing towards the intake side.

I can't really say there's more power but the engine sounds smoother to me.

Tractionless · 10-04-2018, 08:51 AM

Quote:

Originally Posted by lj909

From what I've read. The higher the pressure, the smaller the gap. If your N/A open them up to get the biggest spark. If your boosted or running some sort of high comp engine or nitrous you need a smaller gap so the spark can make it across.

I personally opened all mine up (can't remember the exact #) made sure they were all the same. And I also got a index washer kit so that they were all pointing towards the intake side.

I can't really say there's more power but the engine sounds smoother to me.

I found the existing OE Plugs to be at a smaller gap than the manual recommends 0.038". I opened the new units to 0.041", the lowest of the scale the manual recommends.

09-13-2018, 10:37 AM	#1 (permalink)
Tractionless A True Z Fanatic Join Date: Jan 2016 Location: Atlantic SE Posts: 1,336 Drives: '10 K23 ST 7AT Rep Power: 30526	OE Spark Plug Gap Range The workshop manual reads 0.043 (standard) to 0.055 (max.). In a non boosted application using OE or OE equivalent plugs; has anyone had positive results opening the gap more toward 0.055? I like to hear from those with both negative and positive experiences and what your gap numbers are/were. Thanks for your insight! PS- The only info. I could find in search related to boosted applications. __________________ Toys Not Tots

09-13-2018, 02:38 PM	#3 (permalink)
lj909 Track Member Join Date: May 2014 Location: Riverside Posts: 584 Drives: 40th 370Z Rep Power: 12	From what I've read. The higher the pressure, the smaller the gap. If your N/A open them up to get the biggest spark. If your boosted or running some sort of high comp engine or nitrous you need a smaller gap so the spark can make it across. I personally opened all mine up (can't remember the exact #) made sure they were all the same. And I also got a index washer kit so that they were all pointing towards the intake side. I can't really say there's more power but the engine sounds smoother to me. __________________ PW 07 HR350Z R.I.P. Totaled by 82yr old woman 2010 40th Anniversary 370Z

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09-13-2018, 12:02 PM	#2 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 805 Drives: 2010 touring Rep Power: 7842	I run the GTR plug at .031” on 93 gas and E85. I know thats a tight gap, and it has worked well for me. Natural of course.