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Author Topic: pioneer 650  (Read 3046 times)

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Offline 1manband

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Re: pioneer 650
« Reply #40 on: May 22, 2017, 09:42:06 pm »
Quote from: 3000 FPS on May 22, 2017, 08:35:08 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.

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Offline 3000 FPS

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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.   
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Offline 1manband

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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.
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Offline 1manband

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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.
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Offline 1manband

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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
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Offline 1manband

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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
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Offline 3000 FPS

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Re: pioneer 650
« Reply #46 on: May 28, 2017, 10:15:43 am »
Quote from: 1manband 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

I was looking at that link for rings.   They list rings for Homelite chainsaws and McCulloch chainsaws. 
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Offline 1manband

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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.
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Offline 1manband

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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.
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Offline 1manband

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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.
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