An old but good reminder of 2 stroke oils
- C George
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An old but good reminder of 2 stroke oils
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes
- Jaguar
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Re: An old but good reminder of 2 stroke oils
this was news to me:
"When all of the two-strokes (the old days) were developed, they all used Castrol petroleum oil at a 20:1 ratio and found that 92-octane gas had the octane reduced to 72 with presence of that much oil. Modern oils won’t affect the fuel quite as much, but if you started with 86- or 87-octane regular fuel, you can see where you’ll end with a very low octane mix. "
I'd like to read something else that states that oil reduces octane.
"When all of the two-strokes (the old days) were developed, they all used Castrol petroleum oil at a 20:1 ratio and found that 92-octane gas had the octane reduced to 72 with presence of that much oil. Modern oils won’t affect the fuel quite as much, but if you started with 86- or 87-octane regular fuel, you can see where you’ll end with a very low octane mix. "
I'd like to read something else that states that oil reduces octane.
Performance CDI -- KDX motocross mods -- the SR KDX -- expansion chamber analysis---> http://www.dragonfly75.com/moto/
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Re: An old but good reminder of 2 stroke oils
Cool read. I have all the KDX owner / service manuals, and remember seeing one of them stating 20:1 or so. I think it was the KDX175.
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- C George
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Re: An old but good reminder of 2 stroke oils
I've read other places where oil reduces octane but I don't recall it to be the 20 points that this person stated.Jaguar wrote:this was news to me:
"When all of the two-strokes (the old days) were developed, they all used Castrol petroleum oil at a 20:1 ratio and found that 92-octane gas had the octane reduced to 72 with presence of that much oil. Modern oils won’t affect the fuel quite as much, but if you started with 86- or 87-octane regular fuel, you can see where you’ll end with a very low octane mix. "
I'd like to read something else that states that oil reduces octane.
Maybe a few points.
I mixed up some premix for my chainsaw at a much higher oil content than usual and besides running like a champ , you could feel a
noticable difference in compression after restarting a few times.
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes
- C George
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An old but good reminder of 2 stroke oils
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes
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An old but good reminder of 2 stroke oils
oil reduces octane ? hmm, that's weird, i would have thought it was exactly the opposite, since most of the modern oils have very high flashpoints. they're meant to lubricate, not to burn.
hmmm
hmmm
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Re: An old but good reminder of 2 stroke oils
So if I switch from 40:1 to 1:40 I should gain at LEAST 12 HP from better ring seal right? Kidding of course
Good read for first time 2 strokers! I've met a lot off people that adjust fuel mix to "lean" or "richer" the bike
Good read for first time 2 strokers! I've met a lot off people that adjust fuel mix to "lean" or "richer" the bike
02 Kdx220
97 Kdx200/220
04 Kx250/500
01 Kx250
01 Kx100
13 Klx140
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93 Cbr900rr 8.37 ET
96 Rm125
97 Kdx200/220
04 Kx250/500
01 Kx250
01 Kx100
13 Klx140
12 Teryx4
11 kfx450r
05 Vulcan 2000
04 636
93 Cbr900rr 8.37 ET
96 Rm125
- Jaguar
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Re: An old but good reminder of 2 stroke oils
Petroleum oil burns along with gas whereas synthetic does not. So maybe that is why they say that "modern oils" (ie: fully or partially synthetic) don't affect the octane much.
Performance CDI -- KDX motocross mods -- the SR KDX -- expansion chamber analysis---> http://www.dragonfly75.com/moto/
- C George
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Re: An old but good reminder of 2 stroke oils
That makes sense to meJaguar wrote:Petroleum oil burns along with gas whereas synthetic does not. So maybe that is why they say that "modern oils" (ie: fully or partially synthetic) don't affect the octane much.
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes