Author Topic: things plug  (Read 1207 times)

0 Members and 23 Guests are viewing this topic.

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 52

  • Total Badges: 22
    Badges: (View All)
    Third year Anniversary Level 5 500 Posts Apple User Second year Anniversary One year Anniversary
Re: things plug
« on: July 25, 2015, 02:56:52 pm »

things are clouded up here, threatening rain....after i woke up from a nap......postponing a brake job.

imo.......

top photo: 
looking at the bottom of the threaded metal portion exposed to combustion.  portion of one side looks clean.  the remainder has black deposits.  shows uneven heat distribution.  if this was wet with fuel after a hot shutdown, rich.  clean area possibly rich washed.  should be colored and color should be uniform around its entirety. 

top photo, 2nd down, 3rd down:
looking at curved ground electrode.  in top photo is is bare of any deposits....getting too hot.  should show deposits about half way on flat section exposed to combustion.  the pencil is pointing to the first signs of deposits on the side of ground.  notice it's down in the curved portion.  electrode is getting too hot in these views as well.

the rest of the photos show a very wide fuel ring.  it will be wider than the dodge plugs.  showed the dodge plug width to establish an example of proper ring and minimum width.

the saw plug was black on on one side of the insulator due in part to ground electrode shrouding coupled with the minuscule distance between the insulator and threaded metal portion of the plug.

the plug in question, is an ngk bpm8y.  going to look for a colder #9 plug replacements and try some different tunings at this point.

don't think the saw will ever see higher loads and heat than it seen in those last 2.5 tanks.  i want to make sure to tune for the most heat soaked and heavy load conditions.

more to come after i get some more plugs.

hope it helps
-joe



hiatus

 

Related Topics

  Subject / Started by Replies Last post
2 Replies
568 Views
Last post October 09, 2011, 07:23:58 pm
by Cut4fun .
56 Replies
2700 Views
Last post March 10, 2015, 12:02:35 pm
by dutchsawdoctor
6 Replies
466 Views
Last post March 20, 2013, 05:45:45 am
by dutchsawdoctor
2 Replies
563 Views
Last post August 18, 2014, 09:02:55 pm
by 1manband
4 Replies
3982 Views
Last post June 04, 2014, 11:54:13 pm
by 3000 FPS
9 Replies
307 Views
Last post August 08, 2015, 12:01:40 pm
by 1manband
5 Replies
510 Views
Last post July 20, 2016, 07:33:47 pm
by 1manband
1 Replies
617 Views
Last post January 06, 2017, 02:48:19 pm
by Cut4fun .
1 Replies
499 Views
Last post June 06, 2017, 08:50:57 am
by Cut4fun .
9 Replies
1350 Views
Last post June 18, 2017, 08:25:10 pm
by Al Smith