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#Post#: 75007--------------------------------------------------
Re: Whats on your bench today
By: Chainsawrepair Date: December 21, 2016, 10:00 am
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HT going to copy that article to post in the 66 610 thread.
Thanks
You must have a stash of magazines like I had on cars. Boxes and
boxes full of 60's thru 80's
#Post#: 75008--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 21, 2016, 2:22 pm
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Your welcome Cut 8) Yeah I got lots of literature alright
....just takes time to properly organize them into a library
after moving recently.
Trying to get my "bikesaw resurrection thread" posted but with
Christmas just around the corner it's busy busy busy.
Just finished spending the morning getting a hearing aid
installed in my left ear. Holy cow what a life changer!!
Should have had one years ago.
When I was a young kid on the farm I damaged that left ear
hearing significantly from shooting and running our old John
Deere 2 cylinder tractors.
When I was logging I got my first hearing test at about 18. The
evidence of damage in that ear was shown then.
40 years later it's still the same until this morning ;D
#Post#: 75011--------------------------------------------------
Re: Whats on your bench today
By: chy_farm Date: December 21, 2016, 6:06 pm
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Nice sand cast Holmen!
It's fun to fabricate my-original-pipe but a factory pipe
usually is said to be calculated and designed more specifically
for all band of spin. Now my interest is if your Yamaha
cylinder-pipe unit has the Power Valve to cover the lower band
of spin Holmen?
Here is a good illustration with report on a Yamaha cylinder,
from a site [Porting and Cylinder Scavenging]
(HTM) http://edj.net/2stroke/BellPerformanceTuning/Bell%20Chapter%203.pdf<br
/>
(HTM) http://edj.net/2stroke/BellPerformanceTuning/Bell%20Chapter%203.pdf
Chy
#Post#: 75014--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 21, 2016, 8:37 pm
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Chy, yes my cylinder has the power valve in the exhaust.
The first thing I did was lock it wide open and then polished
the exhaust port like a mirror.
Now I question the polishing as the factory port had a rough
black painted coating inside the exhaust port.
There is debate on whether to Polish or leave the rough coating.
My exhaust port is oval and with the locked wide open power
valve the saws throttle response to WOT is very quick from a
cold start into the first cut.
#Post#: 75017--------------------------------------------------
Re: Whats on your bench today
By: chy_farm Date: December 22, 2016, 2:15 am
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Holmen, that's a great and very useful report! Very nice.
Chy
#Post#: 75023--------------------------------------------------
Re: Whats on your bench today
By: dutchsawdoctor Date: December 22, 2016, 11:03 am
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;D
(HTM) https://youtu.be/qfGgIxrd1wM
#Post#: 75025--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 22, 2016, 1:21 pm
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Very nice Saul.
I was thinking about that Rex laid back cylinder design for a
few years now. I may rebuild my Yamaha bikesaw like that
design. :)
#Post#: 75026--------------------------------------------------
Re: Whats on your bench today
By: dutchsawdoctor Date: December 22, 2016, 2:21 pm
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[quote author=HolmenTree link=topic=1732.msg75025#msg75025
date=1482434504]
Very nice Saul.
I was thinking about that Rex laid back cylinder design for a
few years now. I may rebuild my Yamaha bikesaw like that
design. :)
[/quote]
that wold be great Holmen
(HTM) http://up.picr.de/21143402sv.gif
#Post#: 75027--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 22, 2016, 3:26 pm
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Actually great design as the new Husqvarna XP saws for example
have gone with the rear laid back cylinder.
Lower center of gravity , better view of the b/c, more room for
a larger muffler or exhaust header pipe with a shorter bar pad.
#Post#: 75028--------------------------------------------------
Re: Whats on your bench today
By: chy_farm Date: December 23, 2016, 1:18 am
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Good analysis Holmen, sounds reasonable to me.
Chy
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