General > General Technical Chat
Question about petrol/gasoline engine oils
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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