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Spark plug installation
Posted by: curt ()
Date: May 23, 2013 04:57PM

Manual says 20-24 ft lbs of torque, and no anti seize. I have always used anti sieze in other vehicles, what are the pro and cons of anti siez? The torque seems great, would an OLD gasket make the torque different? I pulled one plug today with 9,600 miles. It sure looked fine, what is the mileage to expect on a set of plugs? Present plugs are AC45F.



Edited 2 time(s). Last edit at 05/23/2013 09:22PM by MattNall.

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Re: Spark plug instulation
Posted by: MattNall ()
Date: May 23, 2013 04:59PM

With unleaded gasoline 20-25k easily on points Higher energy ignition...will get you more..

I use antiseize 15 ft lb.





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Re: Spark plug instulation
Posted by: RobertC ()
Date: May 23, 2013 05:28PM

65 manual says 15 - 20 ft lbs - I have always used 15 ft lbs like Matt states.

RE anti-seize - I only use a "small bit" - 1/4 the circumference of the plug.

FWIW an AC "F" plug (like AC45F) is not the correct plug for a Corvair (I know, many people seem to use them.).

An AC "F" is not threaded the complete 3/8" reach - like the correct AC "FF" plug.

There is the possibility of the "unprotected" thread in the head getting "carboned up" and when you use a plug with the 3/8" reach threaded - possibly stripping the spark plug hole

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Re: Spark plug instulation
Posted by: Chris Lampe ()
Date: May 23, 2013 05:33PM

curt Wrote:
-------------------------------------------------------
> Manual says 20-24 ft lbs of torque, and no anti
> seize. I have always used anti sieze in other
> vehicles, what are the pro and cons of anti siez?
> The torque seems great,

If by Great you mean excessive, I would agree with you if you have an original unmodified head. However if someone at some point installed time-serts or other insert in the head then you are safe with 20~24ft/lb.

Chris
Rowlett, Tx
NTCA - North Texas Corvair Association
CORSA
'64 Monza 'vert

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Re: Spark plug instulation
Posted by: TIBCO ()
Date: May 23, 2013 05:49PM

I never torque the spark plugs in any of my cars. I run them in by hand until they seat, then give it another 1/8 -1/4 turn max. Never had one come out yet in 45 years or doing it this way. I also use anti-sieze on my Corvair plugs. I apply a thin layer of it to the entire threaded portion, then with a paper towel or rag I wipe as much off as possible leaving only a very, very thin film. After 10,000 miles, they look as good as they did after one month. I just changed them out of habit I guess.

Cliff Tibbitts
Lexington, KY
CORSA, CKCE
66 Monza, 140/4sp

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Re: Spark plug intallation
Posted by: Frank DuVal ()
Date: May 23, 2013 08:58PM

Robert, we use F plugs instead of FF plugs because AC discontinued the FF style back in the early 80s! You have a secret stash?

The only caution is if one gets some NOS FF plugs and wants to use them after having F plugs in the head, is to run a chase through there to remove that last thread of carbon. I've never had that little bit of carbon cause thread damage when removing an F plug.

Note, the Bosch plug (W8AC) that is very popular to use now is also the F style, with the missing last thread. This missing last thread plug design is used by most every air cooled Volkswagon on this planet.

Frank DuVal

Fredericksburg, VA

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Re: Spark plug intallation
Posted by: RobertC ()
Date: May 23, 2013 10:38PM

Frank DuVal Wrote:
-------------------------------------------------------
> Robert, we use F plugs instead of FF plugs because
> AC discontinued the FF style back in the early
> 80s! You have a secret stash?
>
> The only caution is if one gets some NOS FF plugs
> and wants to use them after having F plugs in the
> head, is to run a chase through there to remove
> that last thread of carbon. I've never had that
> little bit of carbon cause thread damage when
> removing an F plug.
>
> Note, the Bosch plug (W8AC) that is very popular
> to use now is also the F style, with the missing
> last thread. This missing last thread plug design
> is used by most every air cooled Volkswagon on
> this planet.


Hmmm, Well I learned one thing tonight. I now have the same "problem".

I checked the spark plug (Nippondenso / Denso) that I have been using for over 25 years and it has the F style thread. I thought it had the FF style thread (might have 25 years ago???).

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Re: Spark plug installation
Posted by: JimBrandberg ()
Date: May 24, 2013 05:00AM

I like to use a little anti-seize. I don't believe I've ever had heat transfer trouble but I've sure had some difficult to remove plugs and thread trouble. I sure wouldn't go anywhere near 24 foot pounds torque, whether aluminum or inserts the threads are scary. I like Bosch W8AC.
Jim Brandberg
Isanti, Mn.
CorvairRepair.com

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Re: Spark plug installation
Posted by: BritCars ()
Date: May 24, 2013 05:16AM

I've always used Never Seize on spark plugs because I've worked on engines, from Corvairs to Land Rovers, in which it's not been used. I have one plug [#4] that requires an insert because the threads in the head are ruined. When you have to wrestle with a plug you risk damage to the threads - I rather not deal with damage to the head.

I'm in agreement with all who recommend using a light amount.

Jeff

Jeff Aronson
Vinalhaven, Maine 04863
'66 Corvair Monza Coupe 110 hp 4-speed
'66 Land Rover Series II-A 88" SW
'66 Land Rover Series II-A 88" HT
'80 Triumph TR-7 Spider
'80 Triumph Spitfire
[www.landroverwriter.com]
[www.dirgocorvairs.com]
[roversmagazine.com]

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Re: Spark plug installation
Posted by: vairchet ()
Date: May 24, 2013 10:29AM

I too, tighten spark plugs by hand until they seat then torque down an extra 1/4 turn (to crush gaskets on new plugs, 1/8 turn on used plugs). Difficult to obtain accurate torque readings when using swivel jointed plug sockets (cannot reach 3 & 4 plugs directly when carburetors and linkage are in the way).

This is what I use for anti-seize:

Chet in Ramona

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