Engine condition

[boborgera]

I never had to add even one drop of oil between oil changes at 3/4 k each on my 08 Gs':dontknow:
19 thousand miles total. But then i never worried about keeping level right to the top of the full mark,as long as it was between the full and low i was good to go, Some engines seek their own oil level.
I do that with all my vehicles, as long as its half way on the dip stick no need to add.

 

[beanoil]

That confirms something I always have suspected. The Rotax 990 & 991 engines are not quite as tight as is generally accepted in the industry. Less leakdown = better fuel mileage and more horsepower.

(I'm only quoting the most important points.) Less leakdown also means less fuel past the rings to dilute the oil, which causes more wear, and puts the engine into a death spiral as far as wear. I'm still in break-in on mine, but the factory fill will be sent off for a used oil analysis when it's time. I think with the fuel mileage averages posted, and from what I smell and see from the exhaust at start up, that BRP is fueling the Spyder with plenty of fuel, and probably more than needed.

 

[Captain Fin]

I need to add oil

I guess my engine is loose. I add about 6oz on a 3000 mile change schedule.

 

[dabreitbach]

Brp uses nicasyl in the snowmobile cyclinders and usually there is very little wear. If you damage the nicasyl you can send the jug out and have it honed and renicasyled very reasonably.

 

[docdoru]

Brp uses nicasyl in the snowmobile cyclinders and usually there is very little wear. If you damage the nicasyl you can send the jug out and have it honed and renicasyled very reasonably.

Nikasil is short for Nickel Silicon Carbide; however, the sulfur found in low quality gasoline caused some Nikasil cylinders to break down over time, causing costly engine failures.:sour:pps:

 

[Pennyrick]

There is a leakage test that shows the Rotax 990 rings and valve seats shape:

0%-15% (excellent)
16%-25% (good)
26%-40% (fair)
41%+ (poor)

Well.... that certainly is an interesting thread and discussion.

Thanks for starting things off.

I think I know a lot more than I did (about the Spyder).

 

[Rotaxer]

In automotive engines instead of a simple compression test that would indeed tell you you had a compression problem or not. If you pressurized the cylinder and then listen at the the intake (bad intake valve), exhaust pipe (bad exhaust valve), oil fill tube or dipstick tube (rings or valve guides) radiator or radiator overflow tank for bubbles (cracked heads or block) were some indicators of what is possibly going south on you.

 

[Jeriatric]

Nikasil is short for Nickel Silicon Carbide; however, the sulfur found in low quality gasoline caused some Nikasil cylinders to break down over time, causing costly engine failures.:sour:pps:

There's a lesson here for those who care to hear it. Buying cheap gas.......may save a penny today but cost you BIG $$$$ tomorrow. Lincoln or Washington?