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#Post#: 77469--------------------------------------------------
Re: pioneer 650
By: 1manband Date: May 22, 2017, 8:42 pm
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[quote author=3000 FPS link=topic=6436.msg77468#msg77468
date=1495499708]
What does that slanted top above the piston do to the direction
of flow.
[/quote]
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.
#Post#: 77471--------------------------------------------------
Re: pioneer 650
By: 3000 FPS Date: May 22, 2017, 9:44 pm
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Ok now that I see the head mated to the piston it makes more
sense. Pretty cool design.
#Post#: 77506--------------------------------------------------
Re: pioneer 650
By: 1manband Date: May 26, 2017, 8:42 pm
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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.
#Post#: 77508--------------------------------------------------
Re: pioneer 650
By: 1manband Date: May 27, 2017, 7:57 am
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...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.
#Post#: 77509--------------------------------------------------
Re: pioneer 650
By: 1manband Date: May 27, 2017, 8:15 am
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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
#Post#: 77522--------------------------------------------------
Re: pioneer 650
By: 1manband Date: May 28, 2017, 6:32 am
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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
#Post#: 77524--------------------------------------------------
Re: pioneer 650
By: 3000 FPS Date: May 28, 2017, 9:15 am
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[quote author=1manband link=topic=6436.msg77522#msg77522
date=1495971140]
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
[/quote]
I was looking at that link for rings. They list rings for
Homelite chainsaws and McCulloch chainsaws.
#Post#: 77540--------------------------------------------------
Re: pioneer 650
By: 1manband Date: May 29, 2017, 5:45 pm
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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.
#Post#: 77541--------------------------------------------------
Re: pioneer 650
By: 1manband Date: May 29, 2017, 5:50 pm
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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.
#Post#: 77542--------------------------------------------------
Re: pioneer 650
By: 1manband Date: May 29, 2017, 5:53 pm
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some more crankcase related info.
can see where the motor likey. hahaha.
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