On Sun, 5 Mar 2006 15:30:35 -0800 (PST)
George Graham <rx7ez@yahoo.com> wrote:

>
>   Just a thought.  I noticed that the oil coming out of my RD-1A gearbox is
>   foamed, from the meshing gears no doubt, and the oil in the engine may
>   also have some air entrained from the rotor gears.
>  
>   Perhaps it might be prudent to use a separate oil system for the turbocharger.
>   I have one on my gearbox, which consists of the Pegasus electric pump,
>   a reservoir and a filter.  It seems to work very well and is not very heavy.
>  
>   I personally do not need a turbo, but if I did, I'd look at the quality of the oil
>   lube and cooling if my turbochargers kept failing prematurely.
>  
>
> George Graham
> Mazda Rx7ez N4449E
> Sarasota Florida -SRQ
>

 

The use of muli-grade oils is at fault for some foaming. A straight weight dino oil foams less and gives up the bubbles more readily. A straight weight synthetic even less with a bigger margin in film strength and even bigger margin to overheating.

 

I use 40 Wt. RedLine racing oil. There are others.

 

Lynn E. Hanover