The Ford Barn

603Huckster · 07-16-2020, 02:39 PM

Sorry if this has been discussed, I ran a search and didn't find anything. The "Ford Model 'A' Instruction Book" states the plugs should be gapped to .027 and Les Andrews says .035. I have found a few mentions in other threads of making sure their plugs were gapped to .035. My question is, why the discrepancy and which is correct?

WHN · 07-16-2020, 02:56 PM

60 years of Model A’s, gap of .035 never used anything different.

This has been talked about many, many times.

Enjoy.

Purdy Swoft · 07-16-2020, 03:28 PM

I agree !! I think that early in 28 the spark plug gap was was .027 . Henry later decided that a wider gap was better . Les is correct .

Patrick L. · 07-16-2020, 06:17 PM

A sparkler should spark at either setting or anything in between.

The less gap, less chance of high speed misfire
More gap, idle/ low speed will be better

McMimmcs · 07-16-2020, 09:25 PM

Quote:

Originally Posted by Patrick L.

A sparkler should spark at either setting or anything in between.

The less gap, less chance of high speed misfire
More gap, idle/ low speed will be better

This gentleman said it all ! You can take his reply to the bank!

Werner · 07-17-2020, 05:29 AM

Sponsored Links (Register now to hide all advertisements)

Guten Morgen,

modern spark plugs with for example Iridium electrodes tolerate a significantly larger contact distance.

(I drive the NGK 5 EiX with 0.35 ".)

603Huckster · 07-17-2020, 09:25 AM

Thanks for the responses!

Patrick L. · 07-17-2020, 09:28 AM

Quote:

Originally Posted by McMimmcs

This gentleman said it all ! You can take his reply to the bank!

Gentleman ! What a complement ! I think my friends would disagree though.

07-16-2020, 02:39 PM	#1
603Huckster Junior Member Join Date: Jul 2020 Posts: 3	Spark plug gap Sorry if this has been discussed, I ran a search and didn't find anything. The "Ford Model 'A' Instruction Book" states the plugs should be gapped to .027 and Les Andrews says .035. I have found a few mentions in other threads of making sure their plugs were gapped to .035. My question is, why the discrepancy and which is correct?

07-16-2020, 02:56 PM	#2
WHN Senior Member Join Date: Mar 2017 Location: Connecticut Shoreline Posts: 1,977	Re: Spark plug gap 60 years of Model A’s, gap of .035 never used anything different. This has been talked about many, many times. Enjoy.

07-16-2020, 03:28 PM	#3
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Spark plug gap I agree !! I think that early in 28 the spark plug gap was was .027 . Henry later decided that a wider gap was better . Les is correct .

07-16-2020, 06:17 PM	#4
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Spark plug gap A sparkler should spark at either setting or anything in between. The less gap, less chance of high speed misfire More gap, idle/ low speed will be better

07-17-2020, 05:29 AM	#6
Werner Senior Member Join Date: Jan 2019 Location: Germany, near Aachen Posts: 1,194	Re: Spark plug gap Sponsored Links (Register now to hide all advertisements) Guten Morgen, modern spark plugs with for example Iridium electrodes tolerate a significantly larger contact distance. (I drive the NGK 5 EiX with 0.35 ".) __________________ Beste Gruesse aus Deutschland, Werner Ford Model A, Roadster, 1928 Citroen 11 CV, 1947 Hercules W 2000, 1976; (with NSU-Wankel Rotary Engine), Canadian version

07-17-2020, 09:25 AM	#7
603Huckster Junior Member Join Date: Jul 2020 Posts: 3	Re: Spark plug gap Thanks for the responses!