« previous next »
Pages: [1] 2   Go Down

Author Topic: Porting Intake  (Read 3585 times)

0 Members and 25 Guests are viewing this topic.

Offline

  • 5 cube
  • ***
  • Posts: 141
  • Karma: 17

    • Total Badges: 26
    Badges: (View All)
    Tenth year Anniversary Nineth year Anniversary Eighth year Anniversary Seventh year Anniversary Sixth year Anniversary Level 5
Porting Intake
« on: November 29, 2015, 06:17:24 pm »
What are the benefits of enlarging the intake side besides the con of increasing ring wear?
Logged

Share on Bluesky Share on Facebook

Offline

  • Piped Saw
  • *****
  • Posts: 309
  • Karma: 45

    • Total Badges: 21
    Badges: (View All)
    Level 5 Third year Anniversary Poll Voter 100 Posts Second year Anniversary Level 4
Re: Porting Intake
« Reply #1 on: November 29, 2015, 07:08:04 pm »
More time/area without changing port timing
Logged

Offline

  • 5 cube
  • ***
  • Posts: 141
  • Karma: 17

    • Total Badges: 26
    Badges: (View All)
    Tenth year Anniversary Nineth year Anniversary Eighth year Anniversary Seventh year Anniversary Sixth year Anniversary Level 5
Re: Porting Intake
« Reply #2 on: November 29, 2015, 07:39:36 pm »
What effect does this time/area do in relation to the incoming mixture or would this be the right question. Trying to get a better grasp of what's effecting what when porting the I/E.
Logged

Offline

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 1968
  • Karma: 171

    • Total Badges: 31
    Badges: (View All)
    Level 6 Sixth year Anniversary Fifth year Anniversary 1000 Posts Fourth year Anniversary 500 Posts
Re: Porting Intake
« Reply #3 on: November 29, 2015, 07:50:34 pm »
Intake doesn't normally have rings riding over it. You can usually square it up to get more flow quickly as it first opens.
Logged
Like Like x 1 View List

Offline

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 4709
  • Karma: 320
  • Location: Carpenter, Wyoming

    • Total Badges: 43
    Badges: (View All)
    Tenth year Anniversary Nineth year Anniversary Level 7 Eighth year Anniversary Seventh year Anniversary Sixth year Anniversary
Re: Porting Intake
« Reply #4 on: November 29, 2015, 10:33:24 pm »
You want more fuel/air mixture to enter the crankcase.   Moparmyway is right on.
Logged
PP 505, 475, 445.
Like Like x 1 View List

Offline

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 4709
  • Karma: 320
  • Location: Carpenter, Wyoming

    • Total Badges: 43
    Badges: (View All)
    Tenth year Anniversary Nineth year Anniversary Level 7 Eighth year Anniversary Seventh year Anniversary Sixth year Anniversary
Re: Porting Intake
« Reply #5 on: November 29, 2015, 10:48:25 pm »
If you take the port which is oval and square it up and not raise or lower it, then you will have more area open for the same amount of time.   
Now on the exhaust you have to be careful because there you can snag a ring.
Logged
PP 505, 475, 445.
Like Like x 1 View List

Offline

  • 5 cube
  • ***
  • Posts: 141
  • Karma: 17

    • Total Badges: 26
    Badges: (View All)
    Tenth year Anniversary Nineth year Anniversary Eighth year Anniversary Seventh year Anniversary Sixth year Anniversary Level 5
Re: Porting Intake
« Reply #6 on: November 30, 2015, 05:26:29 am »
Thanks for the responses, I didn't want to open the intake side of the 365 and make a mistake, is 65 to 70% the general rule? I can see the wear marks of the outer intake opening in the cylinder.
Logged

Offline

  • 6 cube
  • ****
  • Posts: 209
  • Karma: 32

    • Total Badges: 21
    Badges: (View All)
    Level 5 Third year Anniversary Second year Anniversary 100 Posts 50 Posts Level 4
Re: Porting Intake
« Reply #7 on: November 30, 2015, 07:59:16 am »
Ever wonder why the factory lower edge of an intake port is usually quite curved?
Logged

Offline

  • Piped Saw
  • *****
  • Posts: 309
  • Karma: 45

    • Total Badges: 21
    Badges: (View All)
    Level 5 Third year Anniversary Poll Voter 100 Posts Second year Anniversary Level 4
Re: Porting Intake
« Reply #8 on: November 30, 2015, 08:48:16 am »
Quote from: Chris-PA on November 30, 2015, 07:59:16 am
Ever wonder why the factory lower edge of an intake port is usually quite curved?
My guess is so that crankcase vacuum doesn't fall off the planet
On a stock saw, this could be of concern
Logged

Offline

  • 6 cube
  • ****
  • Posts: 209
  • Karma: 32

    • Total Badges: 21
    Badges: (View All)
    Level 5 Third year Anniversary Second year Anniversary 100 Posts 50 Posts Level 4
Re: Porting Intake
« Reply #9 on: November 30, 2015, 09:24:56 am »
Quote from: Moparmyway on November 30, 2015, 08:48:16 am
Quote from: Chris-PA on November 30, 2015, 07:59:16 am
Ever wonder why the factory lower edge of an intake port is usually quite curved?
My guess is so that crankcase vacuum doesn't fall off the planet
On a stock saw, this could be of concern
Mine is that it is to smooth the pulse edge created when the intake port opens/closes and the effects this has on the retarded carburetors used and the resulting fuel mixture control.   
Logged
Pages: [1] 2   Go Up
« previous next »
 

Related Topics

  Subject / Started by Replies Last post
6 Replies
3499 Views 		Last post June 01, 2016, 09:03:45 pm
by RobbinW
10 Replies
2965 Views 		Last post August 27, 2012, 01:13:55 pm
by CASE5854x4
4 Replies
842 Views 		Last post November 10, 2013, 08:08:03 pm
by eatonpaving
4 Replies
952 Views 		Last post November 19, 2013, 08:08:11 pm
by jacob j.
3 Replies
1166 Views 		Last post January 18, 2014, 12:51:59 pm
by jacob j.
2 Replies
714 Views 		Last post October 05, 2014, 03:44:30 pm
by farmboy
7 Replies
2644 Views 		Last post December 18, 2014, 05:18:24 pm
by Nathaniel Vansickle
1 Replies
580 Views 		Last post January 27, 2016, 11:34:07 am
by Skippysphins
6 Replies
2173 Views 		Last post January 23, 2020, 08:52:42 pm
by ENTS
0 Replies
561 Views 		Last post April 12, 2024, 07:18:31 am
by Cut4fun