<VV> plug thread inserts

[Doug Mackintosh]

I always assumed all Helicoil products were the coiled-wire style, but this spark plug insert IS a solid insert, not the usual Helicoil construction.

-- Doug Mackintosh

  Corsa member since 1996

  Corsa/NC member since 1996,  Virtual Vairs member

  Corvair owner 1969-1971 and 1996-on

--- On Mon, 22/9/08, Frank DuVal <corvairduval at cox.net> wrote:
From: Frank DuVal <corvairduval at cox.net>
Subject: Re: <VV> plug thread inserts
To: dougmackintosh at yahoo.com
Cc: "Virtual Vairs" <virtualvairs at corvair.org>
Date: Monday, 22 September, 2008, 5:52 AM

Glad it worked out.

All the "Helicoil" type inserts have the same threads per inch, as
they 
have the same threads per inch on their outer surface as the inner 
surface the spark plug screws into. This is because the inside is the 
same wire as the outside.

The solid style insets, like KD, can have any outside thread per inch 
specs the manufacturer wants, as the inside and outside are removed from 
each other by the solid wall. The inside TPI must still match a 14mm 
spark plug thread.

I like the K-D style as the hole does not need anymore enlarging (no 
drilling) and can be done on the side of the road. Just grease the tap. 
The leftover aluminum chips seem to blow out the exhaust on startup.

Using the same style insert was the best way to go.

The idea of a shop vac blowing is great for shop installed inserts. I'll 
file this idea away for later.

Frank DuVal

Doug Mackintosh wrote:

> 
> 
>One person suggested that the various insert repairs all share the same
thread in the head, but I found that the K-D insert (which I think is the same
as Clarks C3212) has a smaller diameter and different thread pitch. 
> 
>Based on that, I decided to get the Sav-A-Thread kit and insert and install
it properly. 
>