« previous next »
Pages: 1 [2] 3 4   Go Down

Author Topic: Echo cs670 Porting for Work  (Read 684 times)

0 Members and 0 Guests are viewing this topic.

Offline Cut4fun .

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 23349
  • Karma: 659
  • OHIO REDNECK Saw Repair Getter Done
    • Redneck Chainsaw Repair
Re: Echo cs670 Porting for Work
« Reply #10 on: January 16, 2015, 10:47:37 pm »
Quote from: awol on January 15, 2015, 10:08:21 pm
   Here are the measurements of the stock Echo piston:

   Pin boss width    17mm     .667"
   Pin diameter        12mm    .472"
   Comp height         22.2m    .871"
   Total ht.                40.4mm  1.586"
   Dome ht.             2.29mm    .090"

Good deal.

Here is what I found on meteor 268 piston. I dont know which one though.

Meteor Piston Assembly 50mm for Husqvarna 266, 268 Jonsered 670 Chainsaws Replaces 501 65 88 03

Bore 49.96mm
Height 40.5mm
Head Type Flat
Piston Pin 12mm x 33mm x 8mm
Ring 50mm x 1.5mm (Caber F-Cast GH.F)
Compression/Pin Top to top of Piston 18mm
Compression/Pin Center to top of Piston 24mm
Logged

Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 172
Re: Echo cs670 Porting for Work
« Reply #11 on: January 17, 2015, 10:15:50 am »
Good info thk
Logged

Offline awol

  • 5 cube
  • ***
  • Posts: 78
  • Karma: 25
Re: Echo cs670 Porting for Work
« Reply #12 on: January 17, 2015, 12:38:52 pm »
   That is real good info, thanks.
   There may be other pistons that would work better for increasing transfer flow, but this 268 sure was fast and easy to fit. The limiting factor on getting more performance from this saw, now seems to be the small intake tract. I did go back in to the jug and adjust some ports with that in mind, and here are the results:

https://www.youtube.com/watch?v=4X3ogrtSAUg&feature=youtube_gdata_player
Logged
New ported Husqvarna and Jonsered saws. Woods porting of saws by appointment.

doittheoldway@gmail.com  417-259-0248

Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Echo cs670 Porting for Work
« Reply #13 on: January 17, 2015, 12:59:11 pm »
The saw overall cuts very good.

The engine seems to be leaning out as it gets some heat into it?

I would start out a little richer so when the heat built up, it was still rich enough?
Logged
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline awol

  • 5 cube
  • ***
  • Posts: 78
  • Karma: 25
Re: Echo cs670 Porting for Work
« Reply #14 on: January 17, 2015, 03:05:22 pm »
   Yes, you'r right. The latest video was in "racing" tune, right on the ragged edge. No way would I take it to the woods like that, it has better low end with a working tune.
Logged
New ported Husqvarna and Jonsered saws. Woods porting of saws by appointment.

doittheoldway@gmail.com  417-259-0248

Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 172
Re: Echo cs670 Porting for Work
« Reply #15 on: January 17, 2015, 04:07:07 pm »
Bigger the ports get, the lower the velocity.  Be careful going to big, will make for poor low rpm power
Logged

Offline Cut4fun .

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 23349
  • Karma: 659
  • OHIO REDNECK Saw Repair Getter Done
    • Redneck Chainsaw Repair
Re: Echo cs670 Porting for Work
« Reply #16 on: January 17, 2015, 04:21:47 pm »
What air filter set up you have on that one?  I wish mine had the mesh, but mine has the round $30 air filter like a HD.
Logged

Offline awol

  • 5 cube
  • ***
  • Posts: 78
  • Karma: 25
Re: Echo cs670 Porting for Work
« Reply #17 on: January 17, 2015, 04:51:19 pm »
   This saw also has the round, pleated paper style filter. I did try running it without the filter and cover, but it made very little difference. This saw has very good low end power with a good tune, so I don't think I made the upper transfers to big. It is however running best with almost 180° of intake duration, and quite a lot of blow down to keep the case compression up, and try to give the restriction in aspiration plenty of time to catch up. I think a much larger carb and intake would really help, with a little less intake duration. I will post all of the current timing numbers for discussion when I bring my book back to the house.
Logged
New ported Husqvarna and Jonsered saws. Woods porting of saws by appointment.

doittheoldway@gmail.com  417-259-0248

Offline awol

  • 5 cube
  • ***
  • Posts: 78
  • Karma: 25
Re: Echo cs670 Porting for Work
« Reply #18 on: January 18, 2015, 10:34:03 am »
   Here are the current numbers for this job, this is where it will stay for now.

   Squish:  .021.     comp:190psi.     BD23°       case compression:42°

   Ex   102/156
   In    96/168/84
   Tr125/110
Logged
New ported Husqvarna and Jonsered saws. Woods porting of saws by appointment.

doittheoldway@gmail.com  417-259-0248

Offline Cut4fun .

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 23349
  • Karma: 659
  • OHIO REDNECK Saw Repair Getter Done
    • Redneck Chainsaw Repair
Re: Echo cs670 Porting for Work
« Reply #19 on: January 18, 2015, 02:17:20 pm »
So what do you think of how the echo saws exhaust exits are made?  My 3120 hotsaw used the same idea.
Logged
Pages: 1 [2] 3 4   Go Up
« previous next »
 

Related Topics

  Subject / Started by Replies Last post
6 Replies
1649 Views 		Last post June 01, 2016, 09:03:45 pm
by RobbinW
14 Replies
1356 Views 		Last post March 12, 2016, 10:38:54 am
by 3000 FPS
9 Replies
751 Views 		Last post January 27, 2013, 09:53:49 pm
by BikerBill
8 Replies
429 Views 		Last post February 04, 2014, 05:35:13 pm
by Cut4fun .
12 Replies
842 Views 		Last post August 30, 2013, 06:05:50 pm
by Old Iron Logging
7 Replies
443 Views 		Last post October 22, 2013, 03:22:11 pm
by tlandrum
6 Replies
633 Views 		Last post February 20, 2014, 07:38:22 pm
by Al Smith
2 Replies
460 Views 		Last post February 21, 2014, 10:24:29 am
by SDB777
15 Replies
773 Views 		Last post September 07, 2015, 06:40:03 pm
by Cut4fun .
7 Replies
771 Views 		Last post August 19, 2016, 11:10:42 am
by Philbert