Hey, I took apart a couple RX-4 13B's and noticed the oil pressure regulator on the rear irons didnt look like the normal reg's I see in all the newer 13B's

They both look like a Racing Beat adjustable reg.





Are they all like that?

 

its not adjustable. the pre-RX-7 ROPR came with removeable cap that you can shim to increase oil pressure.

 

Right on. Good to know.

Thanks

 

Wait one more question....

Heres a Racing Beat adjustable OPR installed on a T2 rear iron.



Now how do you adjust it? What makes it adjustable? I've installed a few of these in engines and never really ever thought about it.

 

Hey Joe , has to be shimmed.according to .......>Spec Are you using a stock oil pan , or mod 5qt, Moroso , premix etc.... Modify your stock 1 you know how much NOS i shoot i n my PPs and there all home modded! Never had a problem with lubrication....All pre 85 13bs are like that .

 

I know all '74 and older engines had the so called adjustable ROPR. When I tore down a '76 Cosmo and '78 RX-4 engines, they were the non adjustable type. Either they were swapped out during a rebuild, or Mazda stopped using the 'adjustable' type by '76.