MOUNTAIN ENGINE FAILURES WITH TURBO CHARGER

[powder muncher]

A lot of guys don't open up the engine-compartment either, the stock set up does not allow heat to escape very well, I did some mods to allow air in and snow-spray on my oil-tank for cooling as well as all sorts of ventilation for hot air to escape, a extra rear cooler goes without saying.
We have melted the plastic pluck on the mag side behind the oil-tank ice-racing with the stock engine, you guess what the oil-temp must have been.

 

[Ted Jannetty]

No disrespect to you too, But there are hundreds of us boosted yamis running in the mountains with No Engine failures running High boost for long long pulls with no problems. I think these couple of failures that you heard about are very isolated.........Also I believe there is only one turbo company that is using a smaller then stock oil tank, or am I wrong?

Your right but I didn't want this to turn in to a company bashing session so they will remain nameless.

I just want to keep it to problem and solution.

Over this winter I have talked to 12 different people from all over that have had engine failures, I am sure you guys have your act together and that is why your not having a problem.

Not everyone that rides a turbo Yamaha belongs to this board.

Peace! Ted.

 

[Philscbx]

[quote="Ted JannettyThe oil gets most all of its heat from the bottom of the pistons, oil is a coolant contrary to popular belief,Ted.

So, in your opinion Ted, what kind of oil is the best for turbo charged engines, .....synthetic, dino, raitings etc.?

A high quality synthetic DIESEL oil is the best you will get....Rotella T 5/40 comes to mind.[/quote]

Your on the right track, but I'd go one step further with 15-40.
What Yamaha engineers recommended, was for stock engines. Total testing of syn's in sub temps proved great, but not for high temps. The turbo, and non-turbo engines tested made the decision. Not me.
No matter where general aviation engines live, they all use Shell Rotella 15-40. Turbo as well.

 

[TWIN TURBO]

Philscbx is correct I believe,
The oil formulations have changed over the past several years. With the advent of roller camshafts, the oil manufactures have removed the high load additives out of the oil which were need for flat tappet camshafts. The oils that still have these desireable additives are the diesel oils like Shell Rotella T or Mobile Delvac 1300 and Some of the synthetic blends like Delvac synthetic also have this additive package and come in a 5w40 weight which I use exclusively. Most Synthetics not only increase flow properties but contain an better additive package suited for high temps and high load. BUT not all oils synthetic or petroleum base contain these high load packages. The diesel oils are most desireable for this purpose.