Another sandwich adapter question

[a bear]

I'm looking to install an oil bypass filter on a 2006 GMC with the Duramax Diesel. Rather than going with the most common install of returning oil to a non pressurized source I'd like to take my oil from the full flow filter dirty side and return the oil to the clean side via the use of a sandwich adapter if one is made or can be modified for this application. Basically one that will have taps for paralleling the full flow filter but not interupt normal flow. I also plan to drill the orifice in the bypass filter outlet to a pre determined size to initiate enough bypass flow under less diffriential. The bypass flow would be initiated via the diff pressure across the full flow filter. BTW the Duramax has a 17 psi internal bypass in the full flow filter. My reasoning for doing this is to relieve some of the bypassing and work load within the full flow filter while not having to rob flow and oil pressure within the system.

Does anyone know if such an adapter is available or is there one that can be modified.

Thanks for any help,
Tommy

 

[Gary Allan]

You use a standard size chevy filter on these engines, don't you? I mean as far as phyical size (gasket, etc.).


There's no need for any orifice on the bypass filter if you're returning it to a pressurized location. There's no reason to restrict flow as it is self biasing. Remove the orifice if you desire.

If you use a Permacool, and your volume is high enough at high enough viscosity, then you may have to drill a VERY SMALL hole in the sandwich to allow no more then 2psid across the sandwich. The Permacool built in relief moves a good amount of oil on its own.

 

[a bear]

Yes, I'm running the standard size full flow filter and this system moves a lot of oil. It also incorporates oil jet spray cooling for the underside of the pistons. I thought someone mentioned about 6 GPM but I'm not 100% sure. Does the permacool sandwich have access ports common to both the upstream and downstream (filtered) side of the full flow? If so that would be perfect. Before plumbing the bypass filter I can install a temporary DP gauge across the sandwich and as you mentioned drill as needed if DP is too high. Thanks! I'll check out the permacool site.

 

[Gary Allan]

Yes, the Permacool's primary function is for plumbing a cooler. 6 gallons is nothing too much. I would think that it would have a higher volume. The Permacool relief maintains 2psi differential in most applications. In yours it may go higher. You should be able to tap into the main ports and see what you get under various conditions. Unless you're getting something wild during cold start ..and something a little too high during warm operations ...I'd leave it alone. If you do drill a hole, start VERY VERY SMALL. BTW, DID I SAY START VERY SMALL???? AS SMALL AS YOU CAN FIND

 

[a bear]

Thanks Gary

 

[Ken2]

I'm sceptical of the full flow filter providing enough differential pressure when it is clean and hot to force oil through a bypass filter. The oil won't flow through the bypass filter cold, anyway.

I'd leave the filter engineering to Isuzu. They've designed a good engine. 5% - 10% of the oil flowing through a bypass filter back to the sump is no problem. The oil pump pressure control valve is dumping oil to the sump to regulate the oil pressure anyway once the engine is up to speed.


Ken