661 Oil Test 32:1 vs 40:1 vs 50:1 ?

[bwalker]

I have at least 50 tanks of R50 through this @ 32:1 since the end of last summer. I aint the only one throwing up actual pictures that were taken from saws that get used, and I havent seen anything even close to what you are saying that we will see.

Given it time. You already have discoloration below the rings..

 

[blsnelling]

Frying it from heat is different than from a load though.

Grab Chad's dyno.......meet me in a few hours.

Assuming it's the topend that fails, it's heat that will cause that, regardless of load. Load will cause the saw to generate more heat. As long as the saw reaches a temp capable of exceeding the protection factor of the oil, I don't see that it matters how that heat is generated.

 

[cuttinties]

We need a way to load the engine.

A fan maybe?

Bicycle

 

[Moparmyway]

I have at least 50 tanks of R50 through this @ 32:1 since the end of last summer. I aint the only one throwing up actual pictures that were taken from saws that get used, and I havent seen anything even close to what you are saying that we will see.

Given it time. You already have discoloration below the rings..

This is too funny
I can get confused in my old age .......................... are you BA ?

 

[RedFir Down]

372 crank bearing are only about $12 for the pair. Of course there's the possibility of blowing out the big end rod bearing. I'm willing to take that risk. I'm actually quite interested to see how it holds up.

Brad, I have an idea.
Since a new OEM crank assembly (I couldn't find a bare crank) is around $225 and since we are torture testing after market parts her for the sake of oil.
I think it would be wise for you to save your good OEM crank. My cost at weedeaterman is $64 for an aftermarket crank. I would be willing to pay half. I could even call Henry to see if he could help us out with our R&D project.

What do you say?

 

[Trx250r180]

would a chainsaw winch load it enough ?

 

[Moparmyway]

Nobody has a few mini-macs for this ??

Each one of us can take them apart in 5 minutes

Give me an address and mine will be on its way

 

[bwalker]

Assuming it's the topend that fails, it's heat that will cause that, regardless of load. Load will cause the saw to generate more heat. As long as the saw reaches a temp capable of exceeding the protection factor of the oil, I don't see that it matters how that heat is generated.

Free revving a saw doesn't load it hard or make it run hot at all unless your carb tuning is off. However you might run into issues exceeding it's redline rpm.

 

[bwalker]

And

This is too funny
I can get confused in my old age .......................... are you BA ?

50 tanks isn't much.

 

[Moparmyway]

And

50 tanks isn't much.

We saw pictures of a dozen tanks make the top of a piston look like burned pepperoni pizza

 

[bwalker]

We saw pictures of a dozen tanks make the top of a piston look like burned pepperoni pizza

Which pic are you referring too?

 

[blsnelling]

Free revving a saw doesn't load it hard or make it run hot at all unless your carb tuning is off. However you might run into issues exceeding it's redline rpm.

I would tune to factory RPM before beginning the test.

 

[KenJax Tree]

How close is factory RPM to being a good tune? I've never really paid much attention to it.

 

[Moparmyway]

Which pic are you referring too?

http://www.arboristsite.com/communi...-1-vs-40-1-vs-50-1.276534/page-7#post-5295950

 

[gunnusmc03]

Who built the Rpd?

 

[Andyshine77]

And Andy, if your blowing unburnt oil out the muffler your leaching heat and hp out if the combustion chamber. Its likely you will have deposits sooner or latter in the exhaust port from the unburnt oil accumulating. Potentially the same issue with the ring grooves on the exhaust side of the piston.

Zero buildup, the oil washes everything. Now power, yes you likely lose combination efficiency.

 

[KG441c]

Zero buildup, the oil washes everything. Now power, yes you likely lose combination efficiency.

Thats what I was thinkin

 

[bwalker]

http://www.arboristsite.com/communi...-1-vs-40-1-vs-50-1.276534/page-7#post-5295950

Why does that piston look bad to you?

 

[bwalker]

Zero buildup, the oil washes everything. Now power, yes you likely lose combination efficiency.

Yea, but it doesn't wash everything. There are dead spaces with no flow along the surface of the exhaust port and around the ring grooves. Plus it's insane to blow all that oil out the exhaust. Makes a real mess.

 

[bwalker]

BTW 2R uses toluene as a diluent.