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One way oil filter. Is it required?

Ruthr33

By Ruthr33,
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Ruthr33 Enthusiast

Ruthr33

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One way oil filter. Is it required?

Hello, I installed a oil filter relocation kit and cooler on my rb25 and had the hoses were the wrong way. Smashed that motor in minutes!

Anyway. I now have an rb25/30. It has a sandwich plate and oil cooler . The oil filter is mounted to the sandwich plate rather than being relocated. So my oil lines can't have the wrong orientation on this setup. What I'm wondering is what oil filter do I run cause on the 25 when I removed the oil heat exchanger and mount it had that one way looking ball bearing thing. As now it's just a stem on the 30 block with the sandwich plate mounted to it. 

Im guessing the rb30 single cam either had a one way in the filter or just never ran it at all.

The might sound like dumb question but I've made dumb mistakes.

im thinking if it didn't have one way then start up would have no oil Mabey?

I'd love to start my new engine but still scratching my head

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https://www.sau.com.au/forums/topic/466865-one-way-oil-filter-is-it-required/
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89CAL Grand Master

89CAL

Posted
Posted

You nees to understand the difference between an anti-drain back and a bypass valve. The z145 is fitted to both RB30 and RB25 remember, so clearly the anti drain back valve does not do the same job as the valve fitted to the factory RB25 heat exchanger

So an anti-drain back works like a check valve in the filter to keep it primed with oil. This means when the car starts it takes less time for the filter to fill up and oil pressure to build. The bypass valves job is to bypass the filter when it gets blocked (and in some other situations when the oil is cold and thick). The principal behind this being that it is better to supply the engine dirty oil then no oil at all.

So by removing the stock heat exchanger with the bypass valve, you have effectively removed one of the two features of the oil system in the RB25.

Personally, I have run mine the same and don't really think twice about it too often. Chances are (as long as you are changing the filter at proper service intervals), anything that is going to block the filter is probably going to take the engine with it fairly quickly anyway. Or at least thats how i see it anyway

Scott Black Rising Star

Scott Black

Posted
Posted

Rb 30 has the valve in the block and rb25 has the valve in the exchanger, use standard filter on a 30 yet if you have taken the exchanger off a 25 then you need the 418 filter with the valve in the filter


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