Spark Plug Gap

Please restrict your questions and replies to Capri related technical issues!
Post Reply
User avatar
pbar
Posts: 6077
Joined: Thu Jun 07, 2012 6:29 pm
Car(s): Capri 2.0 Laser, frequent driver.
Location: North-West

Spark Plug Gap

Post by pbar » Fri Jul 24, 2020 8:05 pm

Spark plug gap sizes seem to vary depending what you read.

But please can anyone verify what the de facto should be for a 2.0 Laser using NGK AP6FS (2710)

The Haynes states .64mm, but other info, including the specs/jobs page of this very site states 0.8mm. And as the NGK plugs are gapped at 0.8mm I've always left them at that.

I did think that the Haynes supplement section updated the gap size for later Capri's and/or modern plugs but I can't find any info now having just looked.

Paul G
Posts: 1524
Joined: Fri Jul 03, 2015 5:21 pm
Car(s): MK 3 3.0S needing restoration, 2.0S, 1.6 Laser (nearly ready), Fiesta mK2 pop plus, Skoda Octavia VRS,
Location: High Wycombe

Re: Spark Plug Gap

Post by Paul G » Fri Jul 24, 2020 11:23 pm

Yes Paul it's 25 thou or 0.64.. I have the NGK catalogue in my hand right now and it states 0.6mm. I posted this recently for another enquirer on the same subject.

User avatar
pbar
Posts: 6077
Joined: Thu Jun 07, 2012 6:29 pm
Car(s): Capri 2.0 Laser, frequent driver.
Location: North-West

Re: Spark Plug Gap

Post by pbar » Sat Jul 25, 2020 9:28 am

Thank you Paul, appreciate your reply. Actually I think that may have changed you know. The NGK researcher would have copied that from the Haynes I guess. Steve (stevemarl) has checked his Laser handbook and it specifies a gap of 0.75mm (30 thou). I thought the Haynes supplement had this info too but can't spot it now.

Will dig my handbook out later and check that too, but I do think the .64mm info was superceded later on.

User avatar
pbar
Posts: 6077
Joined: Thu Jun 07, 2012 6:29 pm
Car(s): Capri 2.0 Laser, frequent driver.
Location: North-West

Re: Spark Plug Gap

Post by pbar » Sat Jul 25, 2020 10:51 am

Just checked my handbook too and it does state a gap of 0.75mm

Image

Image

Paul G
Posts: 1524
Joined: Fri Jul 03, 2015 5:21 pm
Car(s): MK 3 3.0S needing restoration, 2.0S, 1.6 Laser (nearly ready), Fiesta mK2 pop plus, Skoda Octavia VRS,
Location: High Wycombe

Re: Spark Plug Gap

Post by Paul G » Sat Jul 25, 2020 12:29 pm

Just dug out my owners handbook and what Stevemarl has told you is correct. 30 thou or 0.75mm. This is for Motorcraft plugs.

I remember when I was working we had the online professional version of Autodata and on many vehicles there were different gaps for different brands of plug eg 0.6 for NGK, 0.7 for Bosch, 0.7 for Beru etc. Wish I'd printed off the data sheets for the Capris now.

Might pay to ring your plug supplier to check.

User avatar
pbar
Posts: 6077
Joined: Thu Jun 07, 2012 6:29 pm
Car(s): Capri 2.0 Laser, frequent driver.
Location: North-West

Re: Spark Plug Gap

Post by pbar » Sat Jul 25, 2020 3:07 pm

Thanks Paul.

As the NGK plugs come gapped as per the spec. that is 0.75mm, and I have always fitted those plugs with that gap without issue, I am happy to fit them as that.

340truck
Donator
Donator
Posts: 3419
Joined: Mon Jul 28, 2008 8:00 am
Car(s): Rat - GONE
2.8 - GONE
Volvo - GONE
Now it's Zetec SE Fezzas all the way. 3 in stock 1.6, 1.4 and 1.2
1.6 Ghia is great fun and surprisingly quick. Maybe Puma 1.7 engine in the future?
Location: Hatfield Peverel Essex

Re: Spark Plug Gap

Post by 340truck » Sat Jul 25, 2020 3:43 pm

Used to use a fag packet. Worked fine. Does a tenth of a millimeter (0.64/0.75) make that much difference?
Image

User avatar
Peter-S
Donator
Donator
Posts: 6927
Joined: Mon Jul 28, 2008 7:57 am
Car(s): 1985 Capri 2.0
1983 Capri 2.8i
Location: Kent
Contact:

Re: Spark Plug Gap

Post by Peter-S » Sat Jul 25, 2020 3:58 pm

340truck wrote:
Sat Jul 25, 2020 3:43 pm
Used to use a fag packet. Worked fine.
I remember my granddad doing that in MKIII Cortina one night after it failed to start. I was pretty impressed at the time when it fired up but I hadn't even had my first driving lesson back then.
ImageBanner by Peter Smith, on Flickr

User avatar
pbar
Posts: 6077
Joined: Thu Jun 07, 2012 6:29 pm
Car(s): Capri 2.0 Laser, frequent driver.
Location: North-West

Re: Spark Plug Gap

Post by pbar » Tue Aug 11, 2020 6:10 am

I changed the plugs in mine last night, using the NGK ones with the gap as they came, i.e. as per the later spec of .75mm. Car runs so smooth and well. Also, I had a little judder when pulling off before, thought I'd need to look at the clutch/flywheel, but it's completely gone now. Didn't want to put the car to bed whilst on my celebratory test drive last night, just wanted to keep driving around, love that feeling.

Bug
Posts: 3264
Joined: Sun Jan 04, 2009 3:52 pm
Car(s): Some

Re: Spark Plug Gap

Post by Bug » Tue Aug 11, 2020 7:04 am

pbar wrote:
Tue Aug 11, 2020 6:10 am
I had a little judder when pulling off
We didn't need to know that!
:roll: :D

User avatar
pbar
Posts: 6077
Joined: Thu Jun 07, 2012 6:29 pm
Car(s): Capri 2.0 Laser, frequent driver.
Location: North-West

Re: Spark Plug Gap

Post by pbar » Tue Aug 11, 2020 7:43 am

Hehe, we don't have many secrets around here do we Martin :)

Post Reply