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

[MustangMike]

You can't just do 2 saws, one with each. Any saw can have a flaw (especially a cheap one).

You would need about 10 saws (5 w/each) for the results to be meaningful at all.

 

[Trx250r180]

..How bout some love here

 

[KG441c]

..How bout some love here
View attachment 418326

Id take the orange bottle and run Yamaha ringfree in it

 

[blsnelling]

You can't just do 2 saws, one with each. Any saw can have a flaw (especially a cheap one).

You would need about 10 saws (5 w/each) for the results to be meaningful at all.

For 100% confidence, sure. But definitely not necessary for our purposes.

 

[porsche965]

What test saws would be the best to use?

 

[porsche965]

I wonder if any oil manufacturers would sponsor a saw?

 

[blsnelling]

What test saws would be the best to use?

It would need to be a saw that's easy to disassemble and inspect/repair.

 

[KenJax Tree]

I wonder if any oil manufacturers would sponsor a saw?

I doubt it, they sponsor motorsports and don't care about how well their oil works in chain saws.

 

[Trx250r180]

Clamshell stihl ,could have a bunch of engines with cranks ready to go .

 

[blsnelling]

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?

 

[blsnelling]

Clamshell stihl ,could have a bunch of engines with cranks ready to go .

Too troublesome to disassemble multiple times for inspection and repairs.

 

[KG441c]

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

 

[blsnelling]

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

Exactly. I'll donate this 372 to the cause if we can raise support for a few topend kits.

 

[KG441c]

Aftermarket cylinder kits for a 440 can be got as low as 30$

 

[blsnelling]

I don't have a project 440. Whatever topend is used needs to be of decent quality, while staying cheap.

 

[MustangMike]

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.

 

[KG441c]

No aftermarket from vostore on ebay!! The quality is terrible!!

 

[KG441c]

Brad im not sure if this guy has 372 cylinders but I used this kit the other day and it was suprisingly a decent cylinder http://pages.ebay.com/link/?nav=item.view&id=321548318694&alt=web

 

[KG441c]

Brad ill spring for a top end if we find them in the 30 to 40 range

 

[blsnelling]

unless you are planning on running the saws at 100:1 permanently, the only information you are going to get is which oil lasts the longest at 100:1. The most relevant data is going to be at the conditions for normal operation.


and do you tune them to the max WOT RPM ...tune will change with each oil.

I say run em at 40:1

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.