Spark plug for HEI conversion

nsmithjr · 07-13-2014, 03:57 PM

Converted my 88 marathon over to an HEI, been going thru 2or3 spark plugs a year. Installed a new one, and with in an hour I had a hard time starting and maintain running once I did get it going.
Not sure if I need a hotter or colder plug. Im using an NGK BP5HS, which. I used in it before I made the conversion. Can someone that has done the conversion guide me on a plug that will work better.
Thank you in advance!

1989Marathon · 07-13-2014, 04:02 PM

You shouldn't need to change the plug heat range. What is the gap set to?

nsmithjr · 07-13-2014, 04:49 PM

Check the one in my cart and a new one in the box, both are at. 026

1989Marathon · 07-13-2014, 05:11 PM

Open the gap to .040". HEI requires a larger gap. If that doesn't help the starting/running issue, I'd look for something else that is causing it.

nsmithjr · 07-13-2014, 05:20 PM

Thank you. I will give it a try. I appreciate it

nsmithjr · 07-13-2014, 09:06 PM

Thanks for the advice. Opening up the gap made a world of difference. Fixed most of my issues.

93yellowclubcar · 07-13-2014, 09:11 PM

The Engine Whisperer strikes again!

1989Marathon · 07-13-2014, 09:16 PM

Quote:

Originally Posted by nsmithjr

Thanks for the advice. Opening up the gap made a world of difference. Fixed most of my issues.

That's good news!

Quote:

Originally Posted by 93yellowclubcar

The Engine Whisperer strikes again!

That's funny 93.

07-13-2014, 03:57 PM	#1
nsmithjr Getting Wild Join Date: Jun 2009 Posts: 84	Spark plug for HEI conversion Converted my 88 marathon over to an HEI, been going thru 2or3 spark plugs a year. Installed a new one, and with in an hour I had a hard time starting and maintain running once I did get it going. Not sure if I need a hotter or colder plug. Im using an NGK BP5HS, which. I used in it before I made the conversion. Can someone that has done the conversion guide me on a plug that will work better. Thank you in advance!
nsmithjr Getting Wild Join Date: Jun 2009 Posts: 84

07-13-2014, 04:02 PM	#2
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: Spark plug for HEI conversion You shouldn't need to change the plug heat range. What is the gap set to?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

07-13-2014, 04:49 PM	#3
nsmithjr Getting Wild Join Date: Jun 2009 Posts: 84	Re: Spark plug for HEI conversion Check the one in my cart and a new one in the box, both are at. 026
nsmithjr Getting Wild Join Date: Jun 2009 Posts: 84

07-13-2014, 05:11 PM	#4
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: Spark plug for HEI conversion Open the gap to .040". HEI requires a larger gap. If that doesn't help the starting/running issue, I'd look for something else that is causing it.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

07-13-2014, 05:20 PM	#5
nsmithjr Getting Wild Join Date: Jun 2009 Posts: 84	Re: Spark plug for HEI conversion Thank you. I will give it a try. I appreciate it
nsmithjr Getting Wild Join Date: Jun 2009 Posts: 84

Today
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07-13-2014, 09:06 PM	#6
nsmithjr Getting Wild Join Date: Jun 2009 Posts: 84	Re: Spark plug for HEI conversion Thanks for the advice. Opening up the gap made a world of difference. Fixed most of my issues. Last edited by nsmithjr; 07-13-2014 at 09:07 PM.. Reason: misspelled word
nsmithjr Getting Wild Join Date: Jun 2009 Posts: 84

07-13-2014, 09:11 PM	#7
93yellowclubcar ΜΟΛΩΝ ΛΑΒΕ Join Date: Nov 2012 Location: West Virginia Posts: 4,094	Re: Spark plug for HEI conversion The Engine Whisperer strikes again!

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