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Thanks for the input Rescue250.
I think the system is bleeding off back to the crankcase through the feed side after it sits for an extended period of time. Although theres more oil volume and plumbing, as long as the system is full upon start up the pressure should rise immediatly. If the system bleeds back some, upon startup the reservoir below the oil transfer block (where the old oil cooler used to sit) is being emtied by the HPOP before it gets oil from the LPOP because its purging air. The transfer block is also where the oil pressure sender is mounted.
If I have the oil bypass hooked up the delay is long enough to trigger a warning on the dash moniter, accompanied by a rough idle (probably because the HPO system is starting to suck air) and a check engine light. With out the bypass hooked up its about a 6 second delay but no other symtoms. The BP bypass line comes out of the cooler, goes throgh the bypass filter, then dumps in the fill tube, hence more oil volume demand.
When my truck sits for a shorter period of time the "dummy " guage reacts within 2 seconds, the same as a stock cold 6.0. The longer my truck sits, the more time its takes the guage to react.
I dont think the check valve in the filter is holding the oil in the cooler and lines that sit above it in the condensor mounted setup, it may be holding it in the bumper mounted version because the cooler is mounted at nearly the same level as the filter.
I didn't come up with this on my own, my tech has been trying to figure this out and this scenerio makes the most sense to me.
BP says they have not experienced any issues like this but I would really like to hear from any other BP oil cooler users, especially the folks with the condensor mounted version and find out how many seconds it takes for their guage to react.
We think we may have a way to check our theory, crack the feed line on the output side of the cooler when the truck is stone cold, if oil doesn't come pouring out then thats it! Then we have to figure out the best way to solve it.
Nothing is ever just a bolt on is it!
06 F350 Lariat Super Crew Cab
SCT SF3 Tuner
Banks Intercooler, Intake, & Exhaust.
ARP Head Studs
Black Onyx Head & Exhaust Gaskets
Garrett GT3788VA Powermax Turbo
ITP Fuel Return System
BulletProof External Oil Cooler
BulletProof EGR Cooler
Hornet/Stealth CCV Mod
Rancho 4.5" Radius Arm Lift
HUGE Thanks To Rob SR & JR at Fleet Service NW
in Hubbard OR, the best in personal & professional
Last edited by 135vtm; 04-08-2010 at 04:35 PM.