Spark Plug Gap - ZR-1 Net Registry Forums

karterdon · 09-30-2008

keep in mind that you do not have a high performance ignition system - So your coils can only produce so much voltage to jump the GAP - the bigger the gap the more umpf you need - So I would stay between the .035 - .040 gap. The plug is not the issue - Its the ignition system we have.

Don Yoakem
91 - #267
Dark Red Met.

jonszr1 · 10-01-2008

i agree . its the coils that limit the gap

Pete · 10-01-2008

1990 has .035 from the factory.
I wouldn't go more then that with stock ignition..

Pete

jonszr1 · 10-01-2008

pete , just wondering why is the 90 different than the other years ?

Pete · 10-01-2008

Quote:

Originally Posted by jonszr1

pete , just wondering why is the 90 different than the other years ?

It's 1990-1992 have .035 factory specs.
1993-1995 are .050 factory specs.

I think for idle quality and they went with those 100,000 mile spark plugs,not 100% sure.
Pete

jonszr1 · 10-01-2008

so would you suggest 35 for every year ?. guess i am going to try 35thou at the strip on fri . i have maybe mistakenly so used 40 -48 thou as gap .it will be fun to find out if it helps at all . thanx for the info pete

karterdon · 10-03-2008

THe reason for the change in gap is that the ignition system received a boost. That's why the gap increased. It was not because of the plugs. If you change your coils to MSD - you could go to a slightly larger gap. The MSD coils have a bit more voltage out put then the factory coils. So if your current gap is .035 I would leave it there or go a go slightly tighter to .032. Coils can work easier.

Best of luck

Don Yoakem
91 #267 Dark Red Met.

09-30-2008	#1
karterdon Join Date: Jan 2008 Location: Antioch, Illinois Posts: 129	Re: Spark Plug Gap keep in mind that you do not have a high performance ignition system - So your coils can only produce so much voltage to jump the GAP - the bigger the gap the more umpf you need - So I would stay between the .035 - .040 gap. The plug is not the issue - Its the ignition system we have. Don Yoakem 91 - #267 Dark Red Met.

10-01-2008	#3
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,667	Re: Spark Plug Gap 1990 has .035 from the factory. I wouldn't go more then that with stock ignition.. Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

10-01-2008	#4
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: Spark Plug Gap pete , just wondering why is the 90 different than the other years ?

10-01-2008	#6
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: Spark Plug Gap so would you suggest 35 for every year ?. guess i am going to try 35thou at the strip on fri . i have maybe mistakenly so used 40 -48 thou as gap .it will be fun to find out if it helps at all . thanx for the info pete

10-03-2008	#7
karterdon Join Date: Jan 2008 Location: Antioch, Illinois Posts: 129	Re: Spark Plug Gap THe reason for the change in gap is that the ignition system received a boost. That's why the gap increased. It was not because of the plugs. If you change your coils to MSD - you could go to a slightly larger gap. The MSD coils have a bit more voltage out put then the factory coils. So if your current gap is .035 I would leave it there or go a go slightly tighter to .032. Coils can work easier. Best of luck Don Yoakem 91 #267 Dark Red Met.

10-01-2008	#2
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: Spark Plug Gap i agree . its the coils that limit the gap