I did replace the DOD Filter earlier in the year as I had a noisy lifter,
[especially when its cold, but not as notable when it gets hot, but still a little bit noisy]
DOD present or not: Present
DOD enabled or disabled. Enabled.
Krusing I've been trawling through some old posts and I note, from a posting you made in Feb 2019, that you were concerned with lifter noise and that you considered replacing the lifters. Did your mechanic suggest replacing the DOD filter as an alternative cure? It seems that you still have some noise but that it's not so noticeable and that it's probably acceptable - would that be correct?
Also in your Feb 2019 post you make mention of a different cam and altered compression ratio's etc. on the AFM engine. Seems that is not widely known or understood; so hats off to you. I may be clutching at straws but do you know what DOD hardware is present in the L76 DOD factory disabled motor? Since the DOD is disabled I'm wondering if Holden used a "normal" cam? Also did they use the uprated oil pump and DOD filter?
It seems to me that with deactivated DOD the higher flowing oil pump would cause problems associated with oil oversupply (gumming up rings etc). Similarly, cam profiles ground to allow for differing compression ratios would be unnecessary and counter productive. So to ask the above questions in a different way - does anybody know if the factory disabled DOD engine has the DOD specific uprated oil pump or the DOD specific camshaft or the DOD specific oil filter?
The Lifter noise was there from about approx. 45,000k, I did mention it to The Dealer at the time,
but they just palmed it off, saying its normal with AFM, so I didn't know anything different at the time.
If I knew it was a common problem, I would of pushed the point, and being a ex GM vehicle,
As mentioned, its still there, more prominent when its cold as you can hear it when you start up, and when I leave home, but doesn't take long to warm up, taking into account, I don't drive it like a grandpa, and I definitely don't thrash it, as I drive it like a V8 should be driven,
But after its warmed up, you can just hear it.
I did mention about compression ratio's, but I don't really know what they should be anyway,
where I did read that the DOD pots are different to the other 4, and wouldn't change the cam or lifters other than keep it stock.
Where I am a bit old school, and prefer to keep it stock.