Hi! Lynn Three questions : Why is the filter before the 2nd cooler & not in front of the first? what did you do with the Mazda pump? How much weight do you think the dry sump systems adds? On Andy's system the set up is unknown, so he could have had restrictions or supply problem at different attitudes (Atkins said that he used bits & pieces from an helicopter). Georges B.

There is a pair of Peterson in line filters in parallel after the scavenge side coolers. I did not include them as few people would start off with contaminated coolers. The scavenge side coolers were contaminated by a single collapsed filter element years back and the Peterson's (70 micron) on keep particles out of the sump tank that might damage the pressure side of the pump.

 

No parts of the stock pump or system components are used. The oil enters through only the inner rear gallery that runs past the dowel gallery and into the rear main bearing. A second line from the filter adapter block parallels the dowel gallery and delivers oil to the front main bearing gallery through a dash 10 by "O" ring boss fitting. In racing, front rotor bearing failures are more common than anything else, so the additional oil line to the front main bearing. Oil pressure is adjusted at the pump, so the outer gallery and the banjo fitting (normal pressure in) and stock pressure relief valve are not used.

 

The weight is a problem. I never though to measure that. The pump is about 3 pounds. The tank is an expended fire extinguisher bottle and weighs about 2 or 3 pounds. I run the tank half full of oil. This gives room for defoaming. Mine is steel and an aluminum tank would be better. I use Aeroquip blue Kevlar hoses. Push on aluminum fittings. Probably not the best choice for aircraft. They are rated at 250 PSI and are very light.

 

There is no "O" ring junction at the front cover to fail. You can have any oil pressure you want. I run 100 PSI at speed. Idle is around 80 PSI. The oil pressure is the same after 45 minutes of racing. On fresh engines, I spin up the oil pump with a 1/2 drill motor and a "V" belt. So all of the air is out of the hoses and the engine has had solid oil pressure for a minute or so before I light it for the first time. Rebuilds are for side seals and a look see and more porting.

Same main and rotor bearings for years. Nothing wears enough to detect year to year.

 

 

Picture shows oil path into front main bearing. Steel tubing is laying in the gallery. The stock oil path from the dowel gallery is also maintained giving two parallel paths.

 

Lynn E. Hanover