UK question: Randys spin oil filter adaptor

[SlowOldGuy]

Or, you can do what I did.  Take the adapter up to the auto parts store, start opening boxes and see what fits.

I found many different filters that fit the adapter.  Currently I'm using a filter that fits a late model small block chevy.

DavidR.

[FJmonkey]

Or, you can do what I did.  Take the adapter up to the auto parts store, start opening boxes and see what fits.

I found many different filters that fit the adapter.  Currently I'm using a filter that fits a late model small block chevy.

DavidR.

Over achiever!!!

[terryk]

Or, you can do what I did.  Take the adapter up to the auto parts store, start opening boxes and see what fits.

I found many different filters that fit the adapter.  Currently I'm using a filter that fits a late model small block chevy.

DavidR.

Over achiever!!!

Using a filter designed for a V8 is not a good decision.

Oil filters often have internal bypass valves. Using an oil filter designed for a V8 is the wrong decision due to the higher PSI bypass valves built into the oil filter cpmpared to a design for a motorcycle or a small care engine, 4 cylinders.

You could end up starving the FJ engine inadvertently as the oil is slowed within the high PSI bypass V8 car oil filter during cold start or cold weather conditions or if the filter gets a bit clogged (common).

The lower PSI bypass valve pressure on oil filters designed for motorcycles and smaller car engines ensures that the oil bypasses the filter more easily than it does with a higher bypass valve pressure found in many filters used for V8's. You want a bypass valve around the 8 PSI figure for a bike or less. Remember this is differential PSI within the oil filter only and has nothing to do with oil bypass circuits within the engine itself.

The lower pressure bypass valve is typically desireable in motorcycles because they have smaller oil pumps, higher performance and you do not want to starve that type of motor for oil. Many car engines are more tolerant and typically have much higher capacity oil pumps to power through any challenges in oil flow. BTW - not all car engines have robust oil pump designs and they also therefore use lower PSI bypass valve figures, smaller KIA's use motorcycle filter designs for the reasons explained above for example.

[SlowOldGuy]

Excellent point Terry, the 2 filters I chose (3675 and 3506) don't even have a relief valve! 

I'm not too concerned, however, since I've never had an oil filter plug up enough to activate a relief valve. 

If something does happen inside the engine that clogs the filter or causes it to stop flowing oil, I'm sure I will notice.  If it's that bad, I doubt a filter bypass will really be necessary since that would indicate significant damage has already been done.  :-)

DavidR.

[terryk]

Excellent point Terry, the 2 filters I chose (3675 and 3506) don't even have a relief valve! 

I'm not too concerned, however, since I've never had an oil filter plug up enough to activate a relief valve. 

If something does happen inside the engine that clogs the filter or causes it to stop flowing oil, I'm sure I will notice.  If it's that bad, I doubt a filter bypass will really be necessary since that would indicate significant damage has already been done.  :-)

DavidR.

Yes, I want to make sure we are on the same page here. There are typically two valves in an oil filter, not always but typically. There is an anti-drain back valve to prevent oil from draining from the filter due to gravity. And, a bypass valve. The bypass is triggered by differential oil pressure in the filter. All motorcycle spin on oilf filters have a bypass valve. Many motorcycle oil filters will be in bypass mode on startup in cold start conditions. If the bypass filter is not triggered due to a high PSI bpass valve design or missing a by pass vlave then you could starve the motor of oil. Not just in a clog condition, which you will not sense anyway.

So, I would never run a motorcycle without a bypass valve, asking for trouble on cold start. Also, IMHO Fram makes a terrible and cheap filter. I worked in the indutry and they are really made from cheap stuff.

Wix or Purolator make the good stuff.

[SlowOldGuy]

Hey Terry,
Thanks for the information.  I went and swapped my filters for ones with a bypass valve.

DavidR.