Antique Engines and Old Iron
[Home] - [HELP] - [Forums] - [Groups] - [Classified Ads] - [Subscribe] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Antique Engine Community > Magnetos, Ignition Coils and Spark Plugs
Forgot Password? Join Us!

Notices

Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

1/2 pipe thread plug adapter


this thread has 12 replies and has been viewed 2119 times

Reply
 
Thread Tools Display Modes
  #1  
Old 01-03-2016, 01:51:26 PM
Walter Neumann jr Walter Neumann jr is offline
Registered
 
Join Date: Feb 2009
Location: Yorkton, Saskatchewan, Canada
Posts: 815
Thanks: 783
Thanked 507 Times in 282 Posts
Default 1/2 pipe thread plug adapter

I was considering building some adapters so you can take an ordinary plug and thread it into 1/2 hole. has any one else done this and what were your results? what common plug would you use? ive seen some for sale some where but its nice when you can make your own, its also getting tougher to find plugs.
Reply With Quote
Sponsored Links
  #2  
Old 01-03-2016, 03:12:28 PM
gootsch gootsch is offline
Registered
 
Join Date: Nov 2011
Location: Newry, Maine, USA
Posts: 417
Thanks: 203
Thanked 182 Times in 145 Posts
Default Re: 1/2 pipe thread plug adapter

30 years ago, listed in the back of the Champion spark plug catalog were adapters to reduce the thread size of spark plugs from no longer available heat ranges and thread sizes to 14 mm threads and N thread lengths which were available in a wide variety of heat ranges and grounding electrode styles. We used them in Rotex snowmobile engines. They worked well. I do not remember what the length of N threads is but I think it is 3/4 of an inch.
Reply With Quote
The Following User Says Thank You to gootsch For This Post:
  #3  
Old 01-03-2016, 07:25:57 PM
Tom G Tom G is offline
Subscriber
 
Join Date: Nov 2004
Location: Tennessee, USA
Posts: 517
Thanks: 506
Thanked 270 Times in 152 Posts
Default Re: 1/2 pipe thread plug adapter

Quote:
Originally Posted by Walter Neumann jr View Post
I was considering building some adapters so you can take an ordinary plug and thread it into 1/2 hole. has any one else done this and what were your results? what common plug would you use? ive seen some for sale some where but its nice when you can make your own, its also getting tougher to find plugs.


Go to the hardware store and buy some pipe bushings which reduce 1/2 inch male down to 1/8 inch female. Drill and tap the 1/8 female hole for a 14 millimeter spark plug. Easily done.
Reply With Quote
The Following User Says Thank You to Tom G For This Post:
  #4  
Old 01-03-2016, 08:38:38 PM
DustyBar DustyBar is offline
Subscriber
 
Join Date: Jan 2011
Location: near Kansas City, Missouri
Posts: 1,983
Thanks: 1,513
Thanked 1,606 Times in 701 Posts
Default Re: 1/2 pipe thread plug adapter

Why not just drill and tap a 1/2" pipe plug. Might have to look for a solid pipe plug and not a thin cast plug to make sure there is enough material to thread.
Reply With Quote
The Following User Says Thank You to DustyBar For This Post:
  #5  
Old 01-03-2016, 09:07:55 PM
Walter Neumann jr Walter Neumann jr is offline
Registered
 
Join Date: Feb 2009
Location: Yorkton, Saskatchewan, Canada
Posts: 815
Thanks: 783
Thanked 507 Times in 282 Posts
Default Re: 1/2 pipe thread plug adapter

Dusty and tom I was thinking something like that. I also was thinking of making a pair for the old faithful hart parr. I think it uses a champion 34 don't remember if those are 3/4 or 7/8 pipe thread. I'm no where near the tractor its an hour from me maybe somebody can confirm for me it would save me a trip. Ideally we have talked about converting it back to ignitors if anyone. Has a line on parts or if we could borrow to reproduce let me know. But for now we will just run buzz coils.
Reply With Quote
  #6  
Old 01-04-2016, 12:35:57 PM
flathead jim flathead jim is offline
Registered
 
Join Date: Dec 2014
Location: Columbia, Pennsylvania
Posts: 20
Thanks: 3
Thanked 8 Times in 6 Posts
Default Re: 1/2 pipe thread plug adapter

Autolite still makes 1/2 inch pipe thread spark plugs part # 3095 i just bought some at advance auto parts for $2.19 each.
Reply With Quote
The Following 3 Users Say Thank You to flathead jim For This Post:
  #7  
Old 01-04-2016, 12:50:42 PM
David Babcock David Babcock is offline
Subscriber
 
Join Date: Nov 2004
Location: Michigan, USA
Posts: 836
Thanks: 9
Thanked 1,308 Times in 321 Posts
Smile Re: 1/2 pipe thread plug adapter

Those adapters are available somewhere. I bought some a few years ago and used them in my 28-50 hart parr. They seemed to work ok. But i thought the plugs-adapter combination looked terrible. I figure if you have a nice old tractor or engine, why make it look cheap with these adapters as about any plug you want is available new or used. Just my thoughts. I kinda like keeping everything correct if possible. Thanks.
Reply With Quote
The Following User Says Thank You to David Babcock For This Post:
  #8  
Old 01-04-2016, 06:42:23 PM
Walter Neumann jr Walter Neumann jr is offline
Registered
 
Join Date: Feb 2009
Location: Yorkton, Saskatchewan, Canada
Posts: 815
Thanks: 783
Thanked 507 Times in 282 Posts
Default Re: 1/2 pipe thread plug adapter

I agree david what im more worried about is function more than beuty it suck when your in a middle of a demonstration and no parts to be had. this is more for a backup
Reply With Quote
  #9  
Old 01-04-2016, 06:52:11 PM
Tom G Tom G is offline
Subscriber
 
Join Date: Nov 2004
Location: Tennessee, USA
Posts: 517
Thanks: 506
Thanked 270 Times in 152 Posts
Default Re: 1/2 pipe thread plug adapter

Quote:
Originally Posted by DustyBar View Post
Why not just drill and tap a 1/2" pipe plug. Might have to look for a solid pipe plug and not a thin cast plug to make sure there is enough material to thread.

Pipe plugs tend to have a squared off top to grip with a wrench. Get a pipe bushing which has a nice flat top and is already drilled down the center. This gives you a good guide hole to start with. You merely enlarge this hole and tap it. BTDT years ago. Get a good quality pipe bushing with a smooth finished surface, and not some of those rough cast Chinese pieces of junk.

A fellow with access to a good machine shop could turn out an adaptor from scratch. The average guy can buy a pipe bushing, and most of the work is already done. The average guy can make all of the adaptors that he wants if he can drill a hole and turn a tap with a wrench. Keep it simple.
Reply With Quote
The Following 2 Users Say Thank You to Tom G For This Post:
  #10  
Old 01-05-2016, 10:16:31 AM
Steve Kunz's Avatar
Steve Kunz Steve Kunz is offline
Subscriber
 
Join Date: Feb 2008
Location: Valley Park, Missouri, USA
Posts: 1,307
Thanks: 6,418
Thanked 1,513 Times in 661 Posts
Default Re: 1/2 pipe thread plug adapter

From what I understand the 14mm spark plug thread is a special pitch at 1.25mm and a regular 14mm tap is 1.5mm pitch??
Here is a link for premade one's for model T Fords.
https://www.modeltford.com/item/14MM-AD.aspx
__________________
Steve Kunz
Reply With Quote
The Following User Says Thank You to Steve Kunz For This Post:
  #11  
Old 01-05-2016, 03:07:58 PM
Walter Neumann jr Walter Neumann jr is offline
Registered
 
Join Date: Feb 2009
Location: Yorkton, Saskatchewan, Canada
Posts: 815
Thanks: 783
Thanked 507 Times in 282 Posts
Default Re: 1/2 pipe thread plug adapter

at 15dollars a set they are not worth making
Reply With Quote
  #12  
Old 01-06-2016, 10:41:56 PM
Tom G Tom G is offline
Subscriber
 
Join Date: Nov 2004
Location: Tennessee, USA
Posts: 517
Thanks: 506
Thanked 270 Times in 152 Posts
Default Re: 1/2 pipe thread plug adapter

Quote:
Originally Posted by Steve Kunz View Post
From what I understand the 14mm spark plug thread is a special pitch at 1.25mm and a regular 14mm tap is 1.5mm pitch??
Here is a link for premade one's for model T Fords.
https://www.modeltford.com/item/14MM-AD.aspx
Available from Sears. What's your problem?


http://www.sears.com/irwin-hanson-vi...2&blockType=G2
Reply With Quote
The Following User Says Thank You to Tom G For This Post:
  #13  
Old 01-09-2016, 12:22:11 AM
cobbadog cobbadog is offline
Registered
 
Join Date: Aug 2009
Location: Coopernook. N.S.W. Australia
Posts: 1,834
Thanks: 3,306
Thanked 817 Times in 551 Posts
Default Re: 1/2 pipe thread plug adapter

Hi Steve Kunz,
with the metric pitch both 1.25mm and 1.5mm are standard options, I have them both for many different sizes in my garage.
It is like the different of UNF & UNC or BSF & BSW it is a coarse and fine thread option for different applications.
Hope this helps.
Reply With Quote
The Following User Says Thank You to cobbadog For This Post:
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
pipe thread cutting TomBall Machine Shop and Tool Talk 18 07-25-2015 01:07:19 PM
3/4 inch pipe thread spark plug REB37E Magnetos, Ignition Coils and Spark Plugs 10 07-23-2014 08:42:16 AM
Spark plug adapter... Jim Sherman Hit & Miss Gas Engine Discussion 1 11-06-2011 02:35:59 PM
Adapter to go from 1" pipe thread to regular exhaust pipe? LombardiniDiesel Small Air Cooled Gasoline Engines 2 02-07-2011 12:15:00 AM
PRIMING CUP 1/4 inch pipe thread Eric McKenna Hit & Miss Gas Engine Discussion 3 07-24-2010 09:35:16 PM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 05:44:58 AM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2019 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277