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

[Trx250r180]

Pro model saw is easier to disassemble. I can have the clylinder off a 440 in less than 5 minutes

What about the crank bearings ?

 

[KG441c]

What about the crank bearings ?

Splitting the cases r a different story. With a clamshell the motor comes out as a unit where a pro model u gotta split the cases seperately.

 

[redbull660]

It's called boundary testing. We're looking for the limits that a given oil can protect to. I would tune to factory RPMs.

All of these oils are going to give superb results at 40:1. You'll never have an oil failure with proper tuning at 40:1. I'm interested in knowing what oil gives the best protection in a catastrophic event, such as an air leak or too lean tuning. This test should provide that data.

If you would like, I will start a different thread on this. I don't want to clutter up your thread too much.

nah man this great stuff! Great points as well. I think it would be better to have the most information in one place.

 

[blsnelling]

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.

 

[Trx250r180]

Brian, before joining this site, I used both those bottles at 50:1 for years, w/o incident, and my old 044 still runs very well.

Exactly ,You should see the clapped out saw run in the woods here still ,run every day ,day in day out on the orange bottle 50 to 1 ,and are still running .They are stock saws ,maybe a muffler mod at best though .In a modded saw things are different .I found out the hard way .

 

[Mastermind]

Is there a cost effective, decent quality topend for the 353/346? It makes high RPMs, desirable for this test IMHO. A test saw should be easy to come up with.

Wait a minute. I have a basket case partial 372 waiting to be rebuilt. Bearings are cheap for it. Would be an interesting test on the rod bearing yoo! How about a cheap reliable topend for it?

I can get 372 top ends for 35.00

I'd propose an 80:1 mix.......

 

[blsnelling]

I can get 372 top ends for 35.00

I'd propose an 80:1 mix.......

Fantastic! Decent enough quality that we could decidedly blame the failure on the mix?

What are your thoughts on this test? How would you do it? Why 80:1? Do you think it will fail there or not? We eventually have to find were a particular oil fails, and then test other oils just below that point. Then if it didn't fail, use less oil until it does. I'm all ears. I've never done anything like this.

 

[Mastermind]

I'll toss it around while I piddle today.

I'll check in again later.

 

[KG441c]

nah man this great stuff! Great points as well. I think it would be better to have the most information in one place.

When is the 660 test Bull?

 

[Mastermind]

We need a way to load the engine.

A fan maybe?

 

[KG441c]

The mother of oil threads!!

 

[Trx250r180]

I bet 80 to 1 you will go through a lot of tanks of fuel with no failures

 

[KG441c]

hoping tomorrow. there is a sea of amish over at this farm today building a barn so today while perfect - is a total no go.

Good deal! Anxious to see it

 

[KG441c]

hoping tomorrow. there is a sea of amish over at this farm today building a barn so today while perfect - is a total no go.

R u near Lancaster?

 

[KG441c]

Oh sorry Redbull I see u r in Wisconsin and not PA. I was gonna ask if u knew Merlin or Levi off Amish Mafia!!! Lol!!

 

[blsnelling]

We need a way to load the engine.

A fan maybe?

I thought about that. I can't think of any way to do that. I do know that a saw can get plenty hot running WOT with no load, especially with the cylinder cover off.

 

[Mastermind]

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

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

 

[redbull660]

Oh sorry Redbull I see u r in Wisconsin and not PA. I was gonna ask if u knew Merlin or Levi off Amish Mafia!!! Lol!!

only Mafia here is me!

 

[KG441c]

only Mafia here is me!

 

[bwalker]

Im just thinkin out loud but if the port , rings, and mufller r staying alil wet the wet oil isnt gonna turn into carbon is it? Wouldnt it be the burnt depoists that form buildup or the burnt depoists with the oil together?

The wet oil builds up, then the muffler or port gets hot enough for a short period of time for some reason..viola carbon.