The Mazda system has only one scavenge section. It requires a very different front cover that is part of the system and the pump is gear driven rather than chain driven and runs backwards. All up it runs about $4,000 installed. Most builders will use it if you insist on one. I have seen one on a racer in 30 years. They work fine, but are hard to find and have zero parts commonality with anything. You can order all of the Moroso pieces one at a time and probably Peterson and Aviaid as well. And the circle track web sites have Moroso and Petersons used for cheap. Even if you buy a used one with a Chevy engine stuck in it, they are dead simple to rebuild. The other, less obvious advantage over the factory race pump, is that you cannot change the speed of that pump should you want more scavenge or pressure volume. Note that the rings and rotors for these pumps seem to be all the same size if not the same actual manufacturer.

 

In the early years I used a home made scavenge pump made from a TR-6 oil pump, and used the stock oil pump for pressure. There was just no money for such things as real dry sump systems. It did work just fine.

 

Make sure your sump tank has a big breather tube diameter and is fitted with an air filter. The tank volume need only be a bit more than what the wet sump would have carried. Tall and thin is the way to go.

The more air space above the oil level the better. An aluminum fire extinguisher bottle is nice. Since no pressure is involved round is not required. Return oil run over a flat baffle before falling into the oil is nice to remove foam and bubbles. Return oil at a tangent to the centerline as well.

 

Lynn E. Hanover

 

 

 

Lynn: In your opinion is the Mazda factory dry sump system better then the Moroso 3 stage Dry sump . It seems that by time I get all the parts purchased for the Moroso version I might be sneeking up on the cost of the factory race version. Can these be purchased somewhere easiliy. Your thoughts?