The Ford Barn

EBarton · 08-25-2023, 08:56 PM

I'm installing a 6.5:1 Head on my Burtz engine, and using Champion WY18 plugs. What is the recommended gap for my spark plugs

J Franklin · 08-25-2023, 10:00 PM

Spark plug gap for modified engines require a bit of experimentation on your part. you can start with standard gap setting and then either make it smaller or wider to see how the engine response changes. I set my 3x plugs at .025 for the best running when I changed to a 6 to 1 Brumfield head.

tinkirk · 08-26-2023, 05:53 AM

Depends on what ignition you are running

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nkaminar · 08-26-2023, 07:04 AM

I have a 6.5 Burtz head, stock distributor but high output coil, and 0.035 gap. A smaller gap at the rotor in the distributor helps.

J Franklin · 08-26-2023, 10:13 AM

A big part of this hobby is the experimentation for me.

nkaminar · 08-26-2023, 07:47 PM

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Generally speaking, a wider gap will give you a better idle but may reduce your wide-open-throttle performance, especially if your coil is marginal. A hot coil will improve performance at WOT with a larger gap. Dragsters use a very large gap with a very hot ignition system and replace the burned out plugs after each run.

08-25-2023, 08:56 PM	#1
EBarton Junior Member Join Date: Aug 2022 Posts: 1	Spark Gap I'm installing a 6.5:1 Head on my Burtz engine, and using Champion WY18 plugs. What is the recommended gap for my spark plugs

08-25-2023, 10:00 PM	#2
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,963	Re: Spark Gap Spark plug gap for modified engines require a bit of experimentation on your part. you can start with standard gap setting and then either make it smaller or wider to see how the engine response changes. I set my 3x plugs at .025 for the best running when I changed to a 6 to 1 Brumfield head.

08-26-2023, 05:53 AM	#3
tinkirk Senior Member Join Date: Jul 2015 Location: SouthWest Michigan Posts: 363	Re: Spark Gap Depends on what ignition you are running Sent from my iPhone using Tapatalk

08-26-2023, 07:04 AM	#4
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,899	Re: Spark Gap I have a 6.5 Burtz head, stock distributor but high output coil, and 0.035 gap. A smaller gap at the rotor in the distributor helps. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

08-26-2023, 10:13 AM	#5
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,963	Re: Spark Gap A big part of this hobby is the experimentation for me.

08-26-2023, 07:47 PM	#6
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,899	Re: Spark Gap Sponsored Links (Register now to hide all advertisements) Generally speaking, a wider gap will give you a better idle but may reduce your wide-open-throttle performance, especially if your coil is marginal. A hot coil will improve performance at WOT with a larger gap. Dragsters use a very large gap with a very hot ignition system and replace the burned out plugs after each run. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.