Author Topic: Poulan pro 5020 PR5020 Poulan 5020 4818  (Read 9872 times)

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Offline 3000 FPS

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Re: Poulan pro 5020
« Reply #130 on: April 21, 2015, 10:13:54 pm »
It's pretty much the standard Poulan cylinder design now - even the PP338PT pole saw I recently modified was the same concept.  It's distinct from the Husqvarna cylinders, except for the 240 which is a sort of cross over design.  I think it is a clever way to make a simple casting into a closed transfer.  The castings seem to be well made. 

I like that it has the rubber coated bearings, which means that decreasing the squish clearance should not be too hard. 

You are correct and I am going to see if the drum sander I made will fit this cylinder.   If it does I am going to tighten up the squish on a new cylinder.   I do have an old cylinder here to practice on.   

I have done this already on a PP 295 so I kind of know what to expect.
PP 505, 475, 445.

Offline aclarke

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Re: Poulan pro 5020
« Reply #131 on: April 21, 2015, 10:33:30 pm »
Cut the bearing bore on the cylinder then deck the mating surface?  Good idea

Offline 3000 FPS

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Re: Poulan pro 5020
« Reply #132 on: April 21, 2015, 10:51:01 pm »
Cut the bearing bore on the cylinder then deck the mating surface?  Good idea

Exactly.   +1
PP 505, 475, 445.

Offline Eccentric

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Re: Poulan pro 5020
« Reply #133 on: April 21, 2015, 10:51:13 pm »
Roger I will likely attempt to employ you to reduce the squish on a PP295/4620 engine sometime in the not too distant future.

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Re: Poulan pro 5020
« Reply #134 on: April 21, 2015, 11:00:14 pm »
Roger I will likely attempt to employ you to reduce the squish on a PP295/4620 engine sometime in the not too distant future.

No problem.
PP 505, 475, 445.

Offline Eccentric

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Re: Poulan pro 5020
« Reply #135 on: April 21, 2015, 11:02:08 pm »
Excellent. 8)

Offline Chris-PA

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Re: Poulan pro 5020
« Reply #136 on: April 22, 2015, 11:23:06 am »
When I reduced the squish on a 42cc Poulan clamshell I used a lathe to turn the bottom on the cylinder, and a sanding drum on a Dremel to move the bearing pockets.  The rubber coated bearing can be used as a sizing tool, as the center line between the cylinder an cap leaves a clear line in the rubber.  Given that they are rubber coated bearings in an un-machined (as-cast) pocket, it is tolerant of minor errors and there will clearly be some inaccuracies in the casting.  Also, one could easily cut down the base with a file and careful measurements rather than a lathe.

Offline 660magnum

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Re: Poulan pro 5020
« Reply #137 on: April 22, 2015, 11:38:13 am »
So the Poulan 5020 lends itself to a poor man's hop up with basic hand tools and careful cut & fit technique. And as mentioned, the rubber coated seals/bearings makes this possible?
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Offline 3000 FPS

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Re: Poulan pro 5020
« Reply #138 on: April 22, 2015, 11:46:48 am »
So the Poulan 5020 lends itself to a poor man's hop up with basic hand tools and careful cut & fit technique. And as mentioned, the rubber coated seals/bearings makes this possible?

Yes.
PP 505, 475, 445.

Offline 3000 FPS

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Re: Poulan pro 5020
« Reply #139 on: April 22, 2015, 11:50:02 am »
What I use is a sanding drum I made on a lathe that is the same diameter as the bearing pocket.  It also does both bearing pockets at the same time.   I then have a sanding disc stuck to a flat ground 1" thick piece of steel.   I use this to sand the base of the cylinder down.
PP 505, 475, 445.

 

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