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Question about petrol/gasoline engine oils

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tautech:

--- Quote from: joeqsmith on August 17, 2023, 07:30:35 am ---
--- Quote from: tautech on August 17, 2023, 03:53:18 am ---
--- Quote from: joeqsmith on August 17, 2023, 02:36:18 am ---
--- Quote from: tautech on August 17, 2023, 01:04:30 am ---
--- Quote from: joeqsmith on August 16, 2023, 10:39:18 pm ---For the 2-strokes,  I was using Yamalube but now Lucas goes in everything.  When I was growing up riding dirt bikes, mostly I used Golden Spectro.   

--- End quote ---
There are different lubrication requirements for 2 strokes if they are:
Air cooled
Water cooled
Marine cooled.

They each have a different lubrication spec for the heat ranges they operate within.
Run any water cooled 2 stroke oil in an aircooled 2 stroke engine at your peril.

--- End quote ---

Water cooled leaf blower?  Mower?  Weed whacker?   LOL!!!   Dirt bikes in my day were Hodaka Ace Super Rat ...  Water cooled wasn't a thing.   As a matter of fact, I knew a guy who knew a guy who built and raced for Yamaha who made one of the first water cooled 2-strokes.   Cutting edge stuff.

--- End quote ---
I listed all 3 as they are each distinctly different but in fact air cooled can be broken into 2 further categories, those that are wind cooled as a motorike is and fan cooled as portable 2 stroke tools are; chainsaws, trimmers, hedgecutters, concrete cutters etc.

While lubricants to suit many 2 stroke types are available, none are expressly formulated for all.
I use 2, air cooled and that recommend for outboards of which there are also premix and auto inject formulations.

--- End quote ---

I have not owned an air cooled 2-stroke bike in I would guess at least 40 years.
--- End quote ---
About then when I sold my last road bike, A Suzuki 250 GT X7 twin one of the last variants they produced after becoming the first 250cc production bike capable of 100mph. Had mine up there a few times.

--- Quote ---We did have an old  Detroit 2-stroke, supercharged + turbo.  I doubt any of the oils your thinking of would have worked.
--- End quote ---
Of course not, that Detroit is a diesel and requires a high detergent diesel oil.

--- Quote ---I used to play with model air plains when I was a kid.  All of them were 2-stroke.  One was a diesel.  Guessing these would all be in their own distinct category as well but nothing that concerns me.
--- End quote ---
Typically they used Castor oils as a lubricant when I fiddled with such stuff too several decades ago.

--- Quote ---Anything I own is fan cooled.  All running the same oil.  Guessing I have been using Lucas at least 10 years now.  I'll let you know when one of my 2-strokes finally dies.  The oldest one that gets any use is the mower.   It's a good test case.
--- End quote ---
Then they'll all use a similarly rated oil albeit at different mix ratios however I try to simplify these using only a couple of mix ratios, 24:1 and 32:1 to cover an old 2 stroke mower, my big boy chainsaw (120cc) a trimmer, and 3 other saws.

Please excuse Joe for going OT

--- Quote ---Thinking of categories, how many does Siglent have for encoders?  Do they offer higher grade for some equipment and lower grade for others, or is it a one size fits all and they are all poor?   Seems I asked this before and you didn't respond.   Had you told me the higher end arbs offered a working encoder, I would have pulled the trigger on one for home but with the lack of any feedback, I assumed they use the same poor part.   Seems the advice was use the buttons.   :palm:
--- End quote ---
It's not an encoder problem but a SW problem as the encoder polling on SDG models is too slow to combat Joe's high speed life.

tautech:
Joe, rather than run total loss combustion chamber lube in rotary engines, when racing 2 stroke oils are used as seen done here by my neighbor setting a NZ record a few years back.



AFAIK it still stands today.

Halcyon:

--- Quote from: tautech on August 16, 2023, 08:35:08 am ---
--- Quote from: Halcyon on August 14, 2023, 08:07:42 am ---Both my mower and line trimmer take the same oil, so it's easier just to keep a larger bottle on-hand.

--- End quote ---
How so ?
If your trimmer a 4 stroke ?

--- End quote ---

Yep.

Both Honda engines. Both take 10W-30 "high detergent" oil of API SJ grade or higher. So even a semi-synthetic should be fine for both purposes. I'm not buying two types of oil.

The line trimmer manual specifically states in big bold text: "Using nondetergent oil or 2-stroke engine oil could shorten the engine's service life".

joeqsmith:
I had a one of the Suzuki GT ram air triples.   My last air cooled 2-stroke was a Kaw triple 500 w/ expansion chambers.   


--- Quote ---Of course not, that Detroit is a diesel and requires a high detergent diesel oil.
--- End quote ---
Bigger difference, we are not blending oil into the fuel to act as a lubricant like all of my 2-strokes.     


--- Quote ---Typically they used Castor oils as a lubricant when I fiddled with such stuff too several decades ago.
--- End quote ---
I don't remember if I had to mix anything in that toy diesel or not.   You had an adjustment for the CR and a way to add heat. 

I mix them the same, rich.  I'll take smoke over a damaged engine any day.   All of the ones I own use a carb.


--- Quote ---It's not an encoder problem but a SW problem as the encoder polling on SDG models is too slow to combat Joe's high speed life.
--- End quote ---
And here I thought I was being slow with it.   I wonder when they did the system design, did marketing, EE management or quality control think it was good enough.


--- Quote ---my neighbor setting a NZ record a few years back
--- End quote ---

8.66 @ 153 in what distance do you use over there?   

Been following a channel where they are attempting to reassemble a 12-rotor boat motor.  It's the size of a big-block.   There are videos of the owner/designer running it.

BrokenYugo:
I use cheap 15w40 turbodiesel oil for all air cooled stuff that only gets used above freezing, works great.

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