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

[HarleyT]

Does it "ping"???

 

[bwalker]

I have a lightly tuned YZ-250 that I have ran with Yamalube 2R at 16:1 and premium pump fuel while riding at the dunes. With a paddle tire.Runs great, the plugs are light tan and the exhaust is bone dry. FWIW this hike has an 09 head and if the jetting isn't right it will detonate very easily in its current state of tune regardless of oil ratio. It will not detonate at 16:1 when I set it up right.

 

[bwalker]

Does it "ping"???

Pinging can be from either pre ignition or detonation. Although in my expiereance pinging is more associated with pre ignition and detonation makes more of a knocking sound with a corresponding loss of hp under load.

 

[nk14zp]

32:1

 

[nk14zp]

Think whatever you want. The saws I build always get an increase in compression. More oil keeps the bottom ends from failing. I've seen the results of 50:1 in a performance engine. Melted rod bearings are common at that ratio. If any saw I build is used at 50:1, I will not be responsible for it's failure.

Oh, since I've only built about 800 saw engines in the last five years......am I screwing with saws too much?

I pulled the muffler on my stock 254xp to mod it and it was drier than a desert at 50:1. I'm a 32:1 guy now.

 

[funky sawman]

The tree I'm cutting on... cuts should take a while. And the 404 full comp 36" I think would show more of a difference if more power is gained or lost. If there is a temp difference that should be telling. If there is a big enough difference in time that will be telling.

Update:

Trx250r180 is sending me some belray h1r so that will be in the test, but will push this back a couple of days to next Tues or Wed.


Got the chains -

Do you guys want me to use the stock muffler? Or this extra one I bought and opened up?

How much did you have to pay out for that muffler?

 

[HuskStihl]

anyone know what temp the 661 jug should actually be at?

Well, the 661 operates on a controlled fusion reactor platform. Within the magnetic containment field, it should be about 1 million degrees Kelvin, give or take a few.

 

[funky sawman]

SO whats the results???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????................?

 

[funky sawman]

ohh yea one more ?

 

[Nitroman]

I never had a problem with R50 in fact it left the best coating of oil i've seen, the Super Techniplate leaves a nasty black sticky goo. But that was on a snowmobile.

That was the reason I quite using it and went to Polaris VES. The Pol was spendy, but better than what I could find out here.

 

[Adirondackstihl]

That was the reason I quite using it and went to Polaris VES. The Pol was spendy, but better than what I could find out here.

VES Gold has got to be the best smelling oil ever!

 

[Nitroman]

Great Minds Think Alike....

 

[Marshy]

Pinging can be from either pre ignition or detonation. Although in my expiereance pinging is more associated with pre ignition and detonation makes more of a knocking sound with a corresponding loss of hp under load.

No it cant. Ping is NOT the used interchangably to define both preignition and detonation. Ping IS detonation and typicall does no harm to engines. Preignition typicall causes catastrophic engine failure due to peak firing pressure before TDC of the stroke. This can bend rods and cause piston and ring failure.

 

[KenJax Tree]

VES Gold has got to be the best smelling oil ever!

I had some Ipone[emoji526] that smelled good enough to eat.

 

[Nitroman]

That is The Magic Oil. I've tried to get that, and Spectro, but no joy.

 

[Adirondackstihl]

I had some Ipone[emoji526] that smelled good enough to eat.

Yeah, that smells good too.
Harder to get tho

 

[KenJax Tree]

Its not cheap but you can get it.
http://gpbikes.com/ipone-samourai-racing-mx-2-stroke-oil.html

 

[Adirondackstihl]

Its not cheap but you can get it.
http://gpbikes.com/ipone-samourai-racing-mx-2-stroke-oil.html

There is a local engine shop that carries it. But like you said, it ain't cheap.

 

[steven stern]

So 50:1 is less oil than 40:1?

 

[KenJax Tree]

Yes 50:1 is 2.6oz and 40:1 is 3.2oz per gallon