Posted by Mike W. on January 1, 2009, 1:13 am
As I just suffered through one, I am naturally reminded of RMD.
Pursuant to previous discussions of 2-strokes and oil ratios and lean
running and gasohol... A person who's opinion I respect a great deal, with
more hands-on experience than any other 5 people I know, suggested I take
my 50:1 mix down to at least 32:1 and preferably 20:1. When I suggested
that could make the engine run lean, his reply was that the oil burns
too.... that gas has 125k btu/gal, alcohol is 75k btu/gal and oil at 140k
btu/gal... that the alcohol leans out the mix but that the oil doesn't.
FYI. I'm back to 32:1. Later.
Mike
--
Mike W.
96 XR400
70 CT70
71 KG 100 (Hodaka-powered)
99 KZ1000P (training)
99 KZ1000P (rider)
00 Beta Rev-3
Posted by JayC on January 1, 2009, 3:41 pm
> Pursuant to previous discussions of 2-strokes and oil ratios and lean
> running and gasohol... A person who's opinion I respect a great deal, with
> more hands-on experience than any other 5 people I know, suggested I take
> my 50:1 mix down to at least 32:1 and preferably 20:1. When I suggested
> that could make the engine run lean, his reply was that the oil burns
> too.... that gas has 125k btu/gal, alcohol is 75k btu/gal and oil at 140k
> btu/gal... that the alcohol leans out the mix but that the oil doesn't.
> FYI. I'm back to 32:1. Later.
Fuel oil (diesel fuel) does, in fact, have 140kbtu/hr. Don't know
about motor oil or two-stroke mix oil. Interesting thought, however -
you monkeywrench thrower. I have an 80cc and 2 125cc 2-stink
motorcycles, a 42cc chainsaw, and a 32cc weedwhacker, and I run 32:1
in all of them. You didn't say why your friend recommended 20:1, but
evidently, testing has shown that peak output power increases with
additional oil up until 16:1 or so.
JayC
Posted by GP on January 2, 2009, 10:44 am
Happy New Year to you, Mike! I can not wait to get out riding again!
Pete called and he wants me to abandon my driveway and take a long
ride up north this summer. I would like it very much if you could join
us!
BTW - I *never* run 50:1. It is just too lean, even for the magical
mystery synthetic oils of today. I'd rather waste oil and build carbon
than accelerate wear on internals. You know how much I hate
wrenching...
Greg
Posted by Mike W. on January 2, 2009, 11:47 am
> Happy New Year to you, Mike! I can not wait to get out riding again!
>Pete called and he wants me to abandon my driveway and take a long
>ride up north this summer. I would like it very much if you could join
>us!
Abandon the driveway?!! They don't take the faces off of Rushmore you know!
COOL invite. Call me interested. You do know my conservatism soars once I
get out of urban traffic? Also... seems we just passed the 10-year
Anniversary of something called "the Hell Ride" in this house:) You guys
aren't going to try and snooker me into a bike and body shredding exercise
are you?:)
> BTW - I *never* run 50:1. It is just too lean, even for the magical
>mystery synthetic oils of today. I'd rather waste oil and build carbon
>than accelerate wear on internals. You know how much I hate
>wrenching...
Same boat!
Happy New Year to you and the family!
Mike
> Greg
--
Mike W.
96 XR400
70 CT70
71 KG 100 (Hodaka-powered)
99 KZ1000P (training)
99 KZ1000P (rider)
00 Beta Rev-3
Posted by GP on January 2, 2009, 10:46 am
BTW - I picked up a nifty Ninja 250 for Jennifer! Maybe I can get my
wife to ride it! Whoo Hoo!
Greg
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> running and gasohol... A person who's opinion I respect a great deal, with
> more hands-on experience than any other 5 people I know, suggested I take
> my 50:1 mix down to at least 32:1 and preferably 20:1. When I suggested
> that could make the engine run lean, his reply was that the oil burns
> too.... that gas has 125k btu/gal, alcohol is 75k btu/gal and oil at 140k
> btu/gal... that the alcohol leans out the mix but that the oil doesn't.
> FYI. I'm back to 32:1. Later.