Originally Posted By: Clevy
Originally Posted By: BlueOvalFitter
Originally Posted By: ZeeOSix
Originally Posted By: KCJeep
You wouldn't think so but I can think of no other reason why the double ADBV filters would cause start up rattle on two different vehicles, one of which was not known for start up rattle (BOF's truck) when the FL-400s yields quiet starts on both. Surely two ADBV's can match the holding ability of the FL-400s, since they couldn't, it makes me look to the higher bypass as a possible cause.
I was using 10w40 as well.
Probably more to do with a silicone ADBV vs. not. If you and BOF were hearing start-up rattle when ambient temps were not very cold (or after the engine sat warm for a few hours), then I'd say ADBV was the cause, not the bypass valve.
It happened on my engine twice on 2 seperate mornings, temperature about 75*. The last time it happened my truck had sat for 10 hours. I then drove it about 1/4 of a mile then shut it off. After 20 minutes I started it up and it was a death rattle for almost 3-5 seconds. The temperature was about 97*-101* and it was in the evening.
Isn't that interesting. Even ambient temps that high and still the death rattle. Interesting.
Get this, when the filter was installed, dry, the engine did not even make ANY noise upon startup. Explain that.