Oil Mixing and Viscosity

[FF]

"Those engines are air-cooled, and so use greater clearances by design.
As noted above, aircraft engines will hopefully always be warmed up properly."

The engine start on 3350's was to first dilute the oil with AV gas before engine shut down, a table with lowest expected outside air temp was used and a push button.

After starting the aircraft would taxi to a run up area where when the proper oil temp and cylinder head temp was reached a timer was started to wait long enough for the AV gas that thinned the oil to evaporate.

Again by the book.

IF the procedure was not used the aircraft had to be in the hangar ,usually O'night.

 

[Nomad Willy]

Ff … P2V ?

 

[catalinajack]

Most piston airplanes run straight 50.

Relevance?

 

[FF]

"Relevance?"

Piston aircraft engines are usually a 50+year old design.

Many of the diesels (certainly DD) and farm equipment marinizations are quite old designs , so the question of which of todays oils are good for them is rational.

Cruising boat engines seldom wear out , they are Killed by owners with a lack of knowledge.Not killing your boats engine is also pretty rational.

***

"Ff … P2V ?'' yup, P2V 7 or SP2H the old way, 3 years as Power Plants officer.

 

[psneeld]

Are we talking heavier weight oil for air-cooled aircraft engines?


If so, like many boating topics in my pilot/captain brain...not much relevance at all.

 

[FF]

"Are we talking heavier weight oil for air-cooled aircraft engines?"

No , the usual question is weather switching from Da Book requirement of 30 or 40 wt. oil on an antique diesel to modern oils is harmful to service life.

 

[phillippeterson]

Relevance?

It is a reply to posts 68 and 84.