RAT full flow question, bypass oil cooler??? Options

[MattR]

I'm trying to understand the RAT full flow system. If a case has been tapped and drilled for the remote filter, does this mean it bypasses the factory oil cooler?

With the setups I've seen, they tap into the remote oil filter housing with the front external cooler and it looks like the stock cooler isnt even used.

(IMG:http://www.tunacan.net/t4/tech/oil_pics/layout.gif)

the full flow system taps into the large oil pressure relief piston just after the cooler? so no oil is being forced through the cooler? Does this sound right?

[Jake Raby]

It's simple..
My full flow arrangement ONLY bypasses the inadequate passages in the crankcase that deliver oil to the oil filter adaptor and to also bypass the stock filter adaptor.

The stock filter adaptor has a by pass valve inside it that makes it NOT A FULL FLOW SYSTEM, so when the oil is cold or at above 45 PSI only a portion of the oil is filtered.

Looking at these diagrams are not the best way to understand our modification, look at a crankcase! The oil is routed from the pump directly to the filter housing (and cooler if needed) and then back to the crankcase and it's fed directly into the same oil galley that the oil ends up at after it goes through all the tweeks and bends within the case and the oil filter housing.

Swapping to full flow removes 4, 90 degree degree bends within the most important portion of the oil flow path, before the entrance to the main oil galley.

The stock oil pressure relief is not altered in function, at all. All we do is reroute the oil more efficiently and filter (and cool if you desire) 100% of it.

98% of the engines I build get this mod.

BTW- Cloudbuster's graph is the most similar to the oil path, look at how much simpler the oil delivery is with the mods... (FWIW industrial TIV engines came from the factory with an arrangement VERY similar to this)