Author Topic: pioneer 650  (Read 520 times)

0 Members and 0 Guests are viewing this topic.

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: pioneer 650
« Reply #40 on: May 22, 2017, 09:42:06 pm »
What does that slanted top above the piston do to the direction of flow.   

sorry, should have posted photos.  forget to that yall don't have the parts in hand.

imo, think it is to get the mix going away from the edge of the piston?  if it stays there bad things happen. pre ignit/deton, wasted fuel, heat...smokey's book, good read.

hiatus

Online 3000 FPS

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 4040
  • Karma: 222
  • Location: Carpenter, Wyoming
Re: pioneer 650
« Reply #41 on: May 22, 2017, 10:44:49 pm »
Ok now that I see the head mated to the piston it makes more sense.     Pretty cool design.   
PP 505, 475, 445.
Agree Agree x 1 View List

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: pioneer 650
« Reply #42 on: May 26, 2017, 09:42:14 pm »
what the numbers look like. 
the far right column....is what i look at to balance the ports.
you can see what needs changing if possible.
hiatus

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: pioneer 650
« Reply #43 on: May 27, 2017, 08:57:09 am »
...not sure yet of the numbers to shoot for.  still have to cc the case to see what rpm it is tuned for and go from there.  the bigger hurdle is even getting to this point.  depends on the success of putting a locating pin in there.  hahaha.  the trans and exh do look a little lean from the previous post.
hiatus

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: pioneer 650
« Reply #44 on: May 27, 2017, 09:15:08 am »
took another look at the needle bearing.  still cannot find the magnifying glass.  hahaha. took 15 photos to get a clear one and enlarged.

torrington B-108 full compliment style

going to get one of those.  it is rated up to 5000 rpm high load.

also going to get caged style higher rpm type of same size.

best bearing cross-reference and size listing that i have found:  http://www.nationalprecision.com/needle-bearings/drawn-cup.php
hiatus
Like Like x 1 View List

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: pioneer 650
« Reply #45 on: May 28, 2017, 07:32:20 am »
these folks still make a ring set for these and other big old saw motors that do not have ring locating pins.  very good quality usa made, used them in bikes.

set #8207 fits the 650
2.25" - 2@ 1/16" rings

https://www.hastingspistonrings.com/ring-finder
hiatus
Like Like x 1 View List

Online 3000 FPS

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 4040
  • Karma: 222
  • Location: Carpenter, Wyoming
Re: pioneer 650
« Reply #46 on: May 28, 2017, 10:15:43 am »
these folks still make a ring set for these and other big old saw motors that do not have ring locating pins.  very good quality usa made, used them in bikes.

set #8207 fits the 650
2.25" - 2@ 1/16" rings

https://www.hastingspistonrings.com/ring-finder

I was looking at that link for rings.   They list rings for Homelite chainsaws and McCulloch chainsaws. 
PP 505, 475, 445.

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: pioneer 650
« Reply #47 on: May 29, 2017, 06:45:47 pm »
correction to the stock numbers.

for the intake incorrectly used ATDC instead of BTDC for the durations.

the intake TA is actually off the chart.  so much for a long dur intake having no torque for this saw.  hahaha.  other things are at play.
hiatus

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: pioneer 650
« Reply #48 on: May 29, 2017, 06:50:34 pm »
some crankcase info.

sorry did not get photo of wrist pin volume... i put enough fluid in syringe to be sure the pin would be covered, read the line.  put the pin in the syringe and then read new line.  the difference is the volume.
hiatus

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: pioneer 650
« Reply #49 on: May 29, 2017, 06:53:32 pm »
some more crankcase related info.

can see where the motor likey.  hahaha.
hiatus

 

Related Topics

  Subject / Started by Replies Last post
7 Replies
1559 Views
Last post October 21, 2011, 07:55:21 pm
by Spike60
1 Replies
416 Views
Last post May 23, 2013, 12:55:10 am
by fordfairlane78
9 Replies
1537 Views
Last post June 26, 2014, 04:48:33 pm
by KilliansRedLeo
2 Replies
341 Views
Last post October 03, 2014, 11:32:49 am
by fossil
8 Replies
710 Views
Last post January 14, 2015, 10:14:53 pm
by Warped5
4 Replies
260 Views
Last post August 16, 2015, 09:26:02 pm
by kb85
2 Replies
222 Views
Last post November 26, 2015, 09:39:30 pm
by Sven Johnson
1 Replies
154 Views
Last post June 29, 2016, 11:52:58 am
by RoyM
9 Replies
553 Views
Last post July 24, 2016, 01:54:18 pm
by Legeance
2 Replies
21 Views
Last post October 06, 2017, 10:03:48 am
by Cut4fun .