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

[redbull660]

***EDIT - Test completed...jump to page 15. http://www.arboristsite.com/communi...1-vs-40-1-vs-50-1.276534/page-15#post-5300597



Looking for some opinions on a test I'm going to do, hopefully this saturday.

Test - mix up 32:1 40:1 and 50:1 with stihl utlra and 92 oct eth free. Start off with 50:1 and do a couple of timed test cuts then take the jug temp with the thermo gun. Then empty the saw and refill and run 40:1 for a bit to get the mtronic doing it's thing with 40:1, then do couple of timed test cuts and take jug temp and repeat same process with 32:1.

Saw - 661R.
Bar - 36" tsumura
Chain - that is the question - I can run either 3/8 or .404. new Stihl RS.

3/8 - pretty much everyone uses that but..
404 - seems to me 404 would require more power and it seems to me that if there was THAT much difference the 404 would make the saw and mix show it better.

So what do you guys think?

 

[KG441c]

That will be very interesting. Dino vs 100% ester bases would also be interesting

 

[funky sawman]

VERY interesting....

 

[funky sawman]

I been running mine with motul 800 2t off road, at 40:1, Im not liking what I see on top the piston

 

[nk14zp]

.404 fer the test.

 

[Haywire Haywood]

Total waste of time.

 

[KG441c]

My favorite is Belray H1R

 

[Moparmyway]

I vote .404 and agree 100%, the .404 will need more power and make more of a difference if there is a difference to be seen

I get H1R on Amazon

 

[Moparmyway]

I been running mine with motul 800 2t off road, at 40:1, Im not liking what I see on top the piston

I think different oils do different things with different fuels.
When I run pump gas with ethanol and 800, combustion chambers look much dirtier than when I run 800 with VP

 

[Natty Bumppo]

I wouldn't expect enough of an improvement or liability to make a difference in cutting speed by changing gas/oil ratios in that range. I thought most of us went with 40:1 or 32:1 rather than the manufacturer's recommended 50:1 for better lubrication and engine protection.
Of course, I could be wrong.
Oh, and go with .404

 

[Trx250r180]

belray 32:1 would be interesting to throw into the mix. But I don't know where to get it though.

I will throw some bel ray in with the bar when i ship it today ,i have 4 -5 oz in a bottle here ,4 oz will be 32 to 1

 

[redbull660]

thanks man! ok well looks like we're doing 32:1 bel-ray as well

 

[blsnelling]

I will run 32:1 regardless of cut times, simply for the protection factor.

 

[Trx250r180]

In my motocross days ,32 to 1 was found to make more power

 

[Chev727]

I've always ran 32:1 in all my 2 strokes from motocross bikes to saws and never an issue with them

 

[KG441c]

.

I will run 32:1 regardless of cut times, simply for the protection factor.

whats your current liking Brad?

 

[redbull660]

oil does burn hotter so maybe 32:1 will be too rich and run hotter than 40:1. To little possibly 50:1 = bad as well? Maybe 40:1 is the sweet spot. Who knows. All speculation. This is why I test stuff. Hopefully we'll get some good info.

 

[KG441c]

Something else to test. Ive liked Mustang Mikes theory of how much hotter does lower octane burn and the temp. Difference on the engine

 

[KG441c]

Yes I agree 87 will make more power but maybe at the expense of more heat but heat does produce energy?

 

[cuttinties]

I think randy already did a test of 87 oct vs like 93 and the 93 was faster.

87 makes more power. The trapped compression ratio on saws is much to low to see any benefit from higher octane fuel.