Remote bypass oil filtration

[MrQ5]

B178 30psid bypass valve too high for cold start. It may starve your engine.

[TheGreenThing]

Seriously? PlaNning to switch to b178 on my next oci

[dvldoc]

The bypass valves will almost always open upon starting when the engine/oil is cold. Also since it takes an engine longer to reach peak oil temperature when the ambient temperature is cold (~less than 40F), the filter is more likely to go into bypass when accelerating.

There is no such thing as a (COLD START) in the Philippines unless you park your car in a refrigerated truck.

First you need to understand why the bypass valve is there. Under *ideal* conditions, the bypass valve will *never* open. Because, when it opens, the oil *by passes* the filter and goes on through to the motor, obviously unfiltered. It is a safety valve. However, in *real* operation, it opens often.

One example is when you start the motor when cold. The oil is thick and does not pass easily through the filtration medium, thus building up to a high pressure drop. So, the bypass valve opens to prevent oil-starvation of the motor. How long it stays open is dependent on how cold the oil is and how long it takes to get near operating temperature. When the pressure drop across the filtration medium drops below the bypass valve setting, then the bypass closes. Blipping the throttle while warming up is a good way to get the valve to open and send unfiltered oil to the motor. A steady warm-up rpm is probably a lot better.

Another example can occur when the motor is fully warmed. At idle, the oil pressure is about 15 to 20 psi, and the pressure drop across the filter is about 1 or 2 psi. You take off towards the redline, and quickly build oil pressure to the 70 to 80 psi range. During that full-throttle acceleration the pressure drop across the filter will exceed the bypass setting, and send unfiltered oil to the motor, until the pressure across the filter has time to equalize. During a drag race, shifting through the gears, the bypass will open several times.

A third example, which you should never experience with frequent oil and filter changes, is when a filter becomes clogged. A spin-on filter can commonly hold 10 to 20 grams of trash before it becomes fully clogged. The bypass valve opening is the only way to keep the motor from becoming oil-starved if the filter becomes clogged.

The bypass valve simply does what it says bypasses the filter and oil flows past it instead of through it, It does not starve the engine of oil.

[bayen]

B178 30psid bypass valve too high for cold start. It may starve your engine.

Thats just the bypass. If the filter is blocked or clogged which again will most not likely to happen as these filters have 4 times dirt holding capacity, plus if you follow a 10,000 to 12,000 km oil change interval then you are perfectly safe from getting the filter cloged.

if the bypass is closed oil simply bypasses the filter and circulates normally. Besides, the philippines is a tropical country, with the ambient temperature we have here in the Philippines the oil is always at a free flow state, unless maybe it starts to get really really cold. and when i say cold, negative degrees which will NEVER happen here in the PH, unless the ice caps starts to melt. hehehe! even in baguio cold temperature there would not be enough to cause the oil to be on a non flow state. so worrying about oil starvation should not be the reason with using a filter having a 30 PSID.

Seriously? PlaNning to switch to b178 on my next oci

its perfectly safe to use a filter having a 30 PSID. just make sure you follow a 10,000 to 12,000 oil change interval then you should be fine.

Heres how a bypass valve works. (copy paste from Bob is the oil guy)

The oil enters the oil filter under pressure through the holes on the perimeter of the base plate.
The "dirty" oil then passes through the filter media where it is "cleaned". It then flows to the central tube and back into the engine through the usually threaded hollow center mounting stud



Oil Filter Flow Diagram
The only thing that holds the "spin-on" oil filter to the engine and keeps the oil from leaking is the base gasket (shown in above picture in red).

The Bypass Valve

Under ideal conditions, the bypass valve will never open. When it opens, the oil by passes the filter and goes on through to the motor, obviously unfiltered. It is a safety valve. However, in real operation, it opens often.

One example is when you start the motor when cold. The oil is thick and does not pass easily through the filtration medium, thus building up to a high pressure drop. So, the bypass valve opens to prevent oil-starvation of the motor. How long it stays open is dependent on how cold the oil is and how long it takes to get near operating temperature. When the pressure drop across the filtration medium drops below the bypass valve setting.

Another example can occur when the motor is fully warmed. At idle, the oil pressure is about 15 to 20 psi, and the pressure drop across the filter is about 1 or 2 psi. You take off towards the redline, and quickly build oil pressure. During that full-throttle acceleration the pressure drop across the filter will exceed the bypass setting, and send unfiltered oil to the motor, until the pressure across the filter has time to equalize. During a drag race, shifting through the gears, the bypass will open several times.

A third example, which you should never experience with frequent oil and filter changes, is when a filter becomes clogged. A spin-on filter can commonly hold 10 to 20 grams of trash before it becomes fully clogged. The bypass valve opening is the only way to keep the motor from becoming oil-starved if the filter becomes clogged.

According to Purolator, the Honda OEM filter bypass setting is 12 to 14 psi. WIX (NAPA Gold) builds their oil filters with a bypass setting of 8 to 11 psi, while AC Delco builds theirs to a setting of 11 to 17 psi. How much do these differences matter? I don't think anyone knows, even the engineers, and each has its own set of advantages and disadvantages.

If you do lots of racing, you're probably better off with a higher bypass setting.
If you do lots of *cold* starting, especially in the winter, or seldom change your filter, I think you're better off with a lower bypass setting. However, with few exceptions, bypass pressures for spin-on filters run in the 8 to 17 psi range, and any of them should work acceptably.

Here is a picture of the breakdown on some oil filters anatomy



As you can see, some bypass valves are built directly in the middle of the filter while a few do not have one.

Here is a cutaway of Bosch's and how each component is located in a filter.



1) Rubber seal

2) Steel baseplate

3) Anti-drainback valve

4) The bypass valve

5) Filter media

6) Filter can

Hopefully this gives you a better idea about filters and how they flow.


Hope this helps in clarifying how bypass valves work.

[TheGreenThing]

Very well said dvldoc

Thank you for that great information! Wish I've knew it before i bought the bt223.. Bought 3 pcs..

[bayen]

Very well said dvldoc

Thank you for that great information! Wish I've knew it before i bought the bt223.. Bought 3 pcs..

Win win ka pa din idol. BT223 is still way better than Vic or other over the counter filters.
Bang for the buck pa din bro.

[ricciboy]

*bayen, do you know the part no. of donaldson filter and caterpillar for 4m41 engine?

[MrQ5]

If your engine is well maintained and following recommended oci you can use the B178 with a 30psid, an excellent choice .

As I said "it may starve your engine", there's a tsikot member with a sludge problem with his vios http://tsikot.com/forums/engine-fuel...advised-93172/ if your psid is too high with the above condition it may starve your engine at cold start.

[sirkosero]

If your engine is well maintained and following recommended oci you can use the B178 with a 30psid, an excellent choice .

As I said "it may starve your engine", there's a tsikot member with a sludge problem with his vios http://tsikot.com/forums/engine-fuel...advised-93172/ if your psid is too high with the above condition it may starve your engine at cold start.

Bakit sa "i love you aubrey miles" thread napunta nung click ko yung link? Hehe

[Arj_11]

Was at Volmax this weekend. Got a B109 oil filter for P480 and BF954 fuel filter for 235. Previously, the 109 did not fit due to a bigger diameter lip. Now the new stocks available are from the US, color red.

Also saw Bayen buying BF7535 fuel filters for Montero. Kaya pala nauubusan nang stocks, namamakyaw!! hehe

Manny also mentioned that new stocks for BD28 will be available by June. He also calrified that last time , 120 pcs inorder nila na BD28. Ang nangyari, 12 lang dumating. Hopefully it's more of a supply issue from Baldwin that's why out of stock parati ang BD28. Rather than Volmax not importing enough pieces.