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Post by thomilee on Oct 29, 2009 22:59:15 GMT -5
 don't stone me but i think my old poulan my have used some homelite parts. the saw is a model 91, 100cc disp. with a bore of 55.5mm, the same as the 100cc 1050 homelite. the usual poulan triangle logo is absent from the piston and instead it says 'made in canada' and the number 2653 inside the dome. the long and short is i need some rings to fit this piston, they are .062" thick. would the homelites match this? are they available ? also the cylinder casting lacks the usual poulan logo and part nos. and has the open transfers iv'e seen on homelites. what do you think ?
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Post by MCS on Oct 30, 2009 13:22:18 GMT -5
In US numbers you have a 2 3/16" bore and 1/16" thick rings. This size is quite common in the larger Homelites and most of the large Homelites that are "Super" use these thin rings. For example the Super 1050 should work. I don't have any experience with these bigger saws so let's see who else chimes in  |
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Post by billg on Nov 1, 2009 1:36:21 GMT -5
Post up some pics of the Poulan as that is a neat saw.
Bill
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Post by thomilee on Nov 2, 2009 5:18:48 GMT -5
i did find some rings for a 1050 homelite. still need main rod needle bearings. 24 rollers,.093"dia. x .535" long.
it's in several boxes right now but there is a picture of a tan 86 on the cscf site library that looks just like it. mine has a 22"straight bar and is direct drive.
11/4-still need the rod bearings, nol luck so far at the local bearing houses.
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Post by thomilee on Nov 7, 2009 0:08:05 GMT -5
i finally tried the 1050 rings in the poulan cylinder, 2.187" at the bottom. what do i find ? ring end gap of .080" ! what is this ?  i know the homelite piston ring ends are pinned as far apart as possible,but on the poulan they are in the same place. one pin drilled down through the crown and lands. just cheap on poulans part. thats a big gas hole.the old rings had a end gap of .110"! i remember when you had to file your end gap clearances. is this the correct end gap for a homelite? should i get a 56mm ring and try and close the gap that way? move the pins? look for a different piston? get a life?  |
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Post by OBR on Nov 7, 2009 11:46:17 GMT -5
Well...just my thought process, but if the new rings close the gap .030 from the old rings, and assuming in ran with these old rings? You are looking at a pretty significant reduction in ring end gap. Shouldn't it run fine with these rings? Maybe you could try 56mm rings though...
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Post by MCS on Nov 7, 2009 15:40:45 GMT -5
.080" is book value for a Homelite. Keep in mind that 2 cycle engines don't have to control oil getting past the rings like a 4 cycle. Is the ring side clearance between .002" and .003"  If so, your good to go. At 6,000 RPMs there isn't much time for anything to leak past the end gap so don't get hung up on this. If the replacement rings are new you will have higher wall pressure too. |
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Post by thomilee on Nov 7, 2009 22:09:53 GMT -5
OBR-i agree with you, just hadn't seen a gap like that. MCS cleared that up with .080" as the stock homelite gap. the old rings were .070" deep and the new ones .092" so there will be more wall pressure as MCS said.won't worry about that anymore. thanks to you both.  there is however .004"-.005" side clearance on the rings,both old and new.is this safe to run ? |
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Post by MCS on Nov 8, 2009 11:49:43 GMT -5
I should be safe to run but it might burn a little oil Here is the page from Vol 4 for the C and XPs  |
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Post by thomilee on Nov 9, 2009 0:36:13 GMT -5
lots of good info on that sheet. one other thing; the wrist pin has an open end and a closed end,forgot which went to the exhaust side. |
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Post by MCS on Nov 9, 2009 11:12:19 GMT -5
The closed end of the wrist pin goes to the exhaust side.
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If so, your good to go.