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Question about petrol/gasoline engine oils

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tautech:

--- Quote from: vk6zgo on August 17, 2023, 01:24:25 am ---Interestingly, the petrol mower which worked properly was an old 1960s "Rover" with an Oz made 4 stroke engine of unknown provenance.

It also had, as was common in those days in this country, a starter handle with which you wound up a large spring, then folded the handle down & bashed it on the top to start.
It would deliver all the stored energy in the spring very quickly, spinning the engine up to speed fast, almost always starting properly.
--- End quote ---
IIRC that probably was an early Tecumseh and likely with an ordinary carby.
Later most went to diaphragm carbs that used intake pulses to work the diaphragm to lift fuel from the tank into the carb fuel bowl.
Some even used the diaphragm to control the choking system for starting and if not set a certain way on reassembly wouldn't work correctly.

More we have to talk about when we get together at Xmas.  ;)

joeqsmith:

--- 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. 

joeqsmith:

--- Quote from: Bud on August 17, 2023, 01:06:48 am ---
--- Quote from: joeqsmith on August 17, 2023, 12:16:44 am ---.   Hard to beat the power density of gasoline.   

--- End quote ---
I am sure your neighbors love the noise and stinking fumes.

--- End quote ---

Are you my neighbor?  If not, how can you be sure of anything? 

tautech:

--- 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.

joeqsmith:

--- 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.  I think the last air cooled 2-stroke I owned was a sled. It had a fan but the heads came up through the hood.  I would guess that was at least 40 years ago too.   I've yet to own a boat, so no concerns there.   

We did have an old  Detroit 2-stroke, supercharged + turbo.  I doubt any of the oils your thinking of would have worked.   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.

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.   

***
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: 

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