Compression and bearing failure.

[ELECT6845]

Do you believe compression kills the bottom end? Or is it cheap oil, cheap bearings, or lack of maintenance? I really have a hard time believing compression kills. A lot of saw have been built with 185 or more on compression and I haven't seen anyone complaining that they lost bottom ends. I'm sure some have went down but after how many hours? Also what was the bearing that failed? Crank bearings or rod bearing?

 

[WSE]

A wise old mechanic once told me it's near impossible to have ultimate performance and ultimate durability. Over the long term building that much compression has to take its toll on the bottom end. But like you mentioned I think cheapo bearings, crap oil and lack of maintenance are more prone to causing catastrophic failures.

 

[WSE]

Plus the fun factor resulting from the boost in compression is so worth the risk!

 

[ELECT6845]

Plus the fun factor resulting from the boost in compression is so worth the risk!

I like the risk and love building saw. Beside most guys will back over them, drop a tree on them, or a crack head will steal them before a bearing ever goes out.

 

[old-cat]

More than 50:1 mix is cheap insurance AND there has been plenty of evidence posted that more oil gives improved performance and longevity.

 

[lone wolf]

More than 50:1 mix is cheap insurance AND there has been plenty of evidence posted that more oil gives improved performance and longevity.

What are you at 40 to one?

 

[ELECT6845]

185 or more I like 36:1 or 32:1

 

[old-cat]

What are you at 40 to one?

190psi is the highest compression I have and I do like 50:1 BUT I have read what the pros say, so I use 40:1 STIHL synthetic now.

 

[pantelis]

More than 50:1 mix is cheap insurance AND there has been plenty of evidence posted that more oil gives improved performance and longevity.

Come on now man what are you say , the factories dont know , the chemical laboratories dont know, the farmers and the cowboys with theirs homemade experiments and theirs ebay grinders know better.

 

[old-cat]

Come on now man what are you say , the factories dont know , the chemical laboratories dont know, the farmers and the cowboys with theirs homemade experiments and theirs ebay grinders know better.

Do you not understand "insurance"?

 

[lone wolf]

Come on now man what are you say , the factories dont know , the chemical laboratories dont know, the farmers and the cowboys with theirs homemade experiments and theirs ebay grinders know better.

EPA forces them to do this it ain't no good.Look what they did to the gasoline.

 

[pantelis]

EPA forces them to do this it ain't no good.Look what they did to the gasoline.

if you talking about the ethanol its a worldwide phenomen, no i speak for theese pross who before a month was carpenters, and farmers and in one night will change to a M.I.T proffesors

 

[ELECT6845]

EPA forces them to do this it ain't no good.Look what they did to the gasoline.

Come on now man what are you say , the factories dont know , the chemical laboratories dont know, the farmers and the cowboys with theirs homemade experiments and theirs ebay grinders know better.

Just pull the top end off any saw at 50:1 and whip the oil off the crank bearings. GOOD LUCK

 

[lone wolf]

if you talking about the ethanol its a worldwide phenomen, no i speak for theese pross who before a month was carpenters, and farmers and in one night will change to a M.I.T proffesors

More oil is less wear.

 

[pantelis]

Do you not understand "insurance"?

Yes i understand and i agree with you for the 50:1

 

[lone wolf]

Yes i understand and i agree with you for the 50:1

I thought he said 40 to 1?

 

[ELECT6845]

Well, we still have no evidence that it's compression. Sounds more like oil to me or lack there of.

 

[pantelis]

Well, we still have no evidence that it's compression. Sounds more like oil to me or lack there of.

Good luck with your saw

 

[lone wolf]

Do you believe compression kills the bottom end? Or is it cheap oil, cheap bearings, or lack of maintenance? I really have a hard time believing compression kills. A lot of saw have been built with 185 or more on compression and I haven't seen anyone complaining that they lost bottom ends. I'm sure some have went down but after how many hours? Also what was the bearing that failed? Crank bearings or rod bearing?

Did you have a bearing fail on yours?

 

[pioneerguy600]

Over 50 years of running my saws at ratio`s of higher oil content has taught me one thing, I still have all my saws, have yet to loose one to oil related failures. 40 -1 is what I run for the last 20 years.