Rap on Oil
Most Snowmobiles have 2 stroke
engines. 2 stroke engines require that oil be mixed in with the gas they
burn. That oil can be mixed in before the gas goes into the tank or later
on right before the gas goes into the engine. Adding oil to the gas before
the tank is called premix, adding oil at the engine is oil injection.
That oil provides lubrication and helps the metal dissapate heat. It also ends up getting burned which causes the famous "two stroke smoke" and is a big reason why two stroke motors are considered dirty and bad for the environment.
So what does that mean? The
average snowmobile owner dumps in oil and never thinks about it again,
and for somebody with oil injection thats probably fine. If all your sleds
have oil injection stop reading now, this article is about premix.
So my disclaimer has made you
nervous, what should you do? Go out an buy some good quality oil and run
it at the manufacturer's recommended rate.
If you're interested in using
less oil go over to Amsoil's website
and check out their 100:1 oil. This stuff is pretty amazing, they claim
that any two stroke engine can run their oil at 100:1. I've personally
run it at 60:1 in a '71 Ski-Doo Olympique 335 that normally would want
20:1 with no problems. The only problem I have is that the stuff is $8.50
Okay so there were no problems
running the Amsoil. The problem came later, I'd only mixed up a gallon
so I ran out pretty quickly. My sled was way back in the woods and all
I had hanging around was some 50:1 premix I'd made up for another sled
using SpectroSno. As far as snowmobile oil goes I consider Spectro's regular
blend to be pretty mediocre stuff, not terrible but nothing outstanding.
Anyway I put a couple gallons
of that mix into the 335 and it got me home. What I should have done at
that point was add oil to bring the overall mixture somewhere close to
20:1 since I was using just conventional oil, but I had heard that even
beyond Amsoil's 100:1 magic oil that all conventional oils today are better
than those of yesteryear and I thought that maybe the 50:1 would be okay.
Remember I'd leaned the carb out.
You guessed it, lack of lubrication,
I kept pulling the engine over as it cooled so it wouldn't sieze but the
damage was done, the rings had melted to the piston and the cylinder was
horribly scored, after the engine cooled off there was essentially no
compression. I wish I'd mixed up more of the Amsoil, I'm still curious
how it would have fared.
As I write this I'm doubly
curious, I've still got most of a quart of the Amsoil oil left but I'm
not daring enough to try it in a sled I actually like. I think the answer
here is a FRANKENSLED!
What do you think about this story?
Let me know!