Lynn,
> How do you adjust the stock oil pressure regulator to higher than 71 lbs.
> I haven't seen the insides but someone mentioned putting it in a press
> and squeezing it down a bit. I assume it compresses a spring, but it
> sounds like a 'quick and dirty' method of adjustment. Can you pull
> them apart and put in a spacer?
> George ( down under)

 

It is more likely that squashing the regulator would make the oil pressure very high because the piston would never move again.  

 

The early 12A and 13B regulators had a scew in bolt plug in the spring end. Just unscrew that plug and clean the piece. Install about 1/4" inch stack of washers under the spring and reinstall the plug. Check the pop pressure with the shop air hose and regulator. Wear eye protection.

 

Use a Phillips screw driver to depress the plunger until it stacks the spring on the added washers, and then check to see that the entire exit port is uncovered by the piston. If not remove  washers until it does.

 

The FD twin turbo 93-95 and probably renesis use a similar regulator but the plug is welded to the body.

 

I would spin that up in the lathe and get the plug unwelded. I don't know if it even has threads, but those regulators are set to 110 to 115 pounds which is pointless for airplane use. If you get one apart, you would need a softer spring to make it work. Anything over 80 pounds is fine for under 9,000 RPM. So if you cannot find an early regulator, Racing Beat has racing regulators

from 105 to 115 pounds as P/N 11812. Or, 80 to 85 pounds as P/N 11810. These appear to be the adjustible style.

 

Lynn E. Hanover