fitteenhundred
Member
Look at my two posts in this thread.
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There is still some oil getting to the lifters,it's just not all of it,and the oil leaking past the solenoids when they're closed (MDS in-active) isn't at the same pressure as when the solenoids are open (MDS active)Has anyone got any knowledge of oil flow in an mds engine when functioning in 8 cyl?
It is far more often than not that the engine operates with 8 cyl. so the mds solenoids are closed limiting pressurized oil to the lifter bore.
There HAS to be oil still getting to the lifters for proper lubrication of the engine.
I'm honestly contemplating buying a block just to study all this.
Thanks, I've seen everything Reignited has put out on the topic...Look at my two posts in this thread.
just found this, just as an fyiThere is still some oil getting to the lifters,it's just not all of it,and the oil leaking past the solenoids when they're closed (MDS in-active) isn't at the same pressure as when the solenoids are open (MDS active)
That's about the best explanation of the system in regards to oil pressure that i've seen.Good find,and thank-you for adding that link to this thread BlackThanks, I've seen everything Reignited has put out on the topic...
I'm more interested in the engineering aspects of the engine
just found this, just as an fyi
MDS explanation
Some of the earlier trucks will set a code for improper oil viscosity,but it seems to be only the 2009's and very early 2010's that have that issue. Anything after that seems to have no issues with 5W-30 or 0W-40 weight oils.So there is at least 3 psi to the lifter bores at all times, they specifically say "This lifter oil keeps the bores lubricated..."
But as with all discussions on the hemi it seems, this article too doesn't get everything right: from experience, I can say that my engine doesn't care whether it runs 20, 30, or 40 weight oil; I get no codes, and about the same percentage of the time regardless of oil choice I get some shake when it deactivates (but never anymore when it activates).
I can't hear the difference, unless putting around slow, with window open.Drove my truck to work this morning with MDS still active, first time since I can remember not turning it off with gear +/-.
To and from work is about 20 minutes each way.
HATED it! On the freeway wasn't bad unless I was coasting or decelerating but surface street speeds... Good lord I need a muffler now.
MDS delete/cam/converter may be on the list soon.
I'm hoping the "hear the wife thing" starts to kick in soon,she justs gets louder until i say i've heard her ,lol /I can't hear the difference, unless putting around slow, with window open.
I have never really noticed it on or off. the light will come on the dash
truck is stock
That is one thing with old age , a lot of stuff don't bother me, have other things , sore joints . need to stop way more often, wife pissed because I can't hear her.
I do turn it off a bit when truck is cold to get the RPM's up a little, may not be a good idea?
1200-1500rpm around town.
Before I moved, with the older ones, a trip to town was 1 hr on the highway, and I had old trucks for work and short trips.
I will watch those clips, seen one before.
One question, all mine have been 5.7's, is there any difference with the 6.4 in the trucks?
The 2500 does infact have and its more noticeable compared to the 1500.I'm hoping the "hear the wife thing" starts to kick in soon,she justs gets louder until i say i've heard her ,lol /
I think the 6.4's have mds,maybe once you get into the 3500's or heavier they don't,but i'm pretty sure the 2500's have mds
Calgary is close to 1/2 million larger then Ottawa and i hate driving it in,i even hate driving in Airdrie now as it's grown to close to 90,000 now,it was under 9,000 when we moved here 30 years ago,and it's not the same city it was back then,aarrgghh,lol. I own land in Saskatchewan and it's looking better all the time,even being in the middle of buttfluck nowhere.If my wifes family wasn't still in Calgary and Airdrie,we would of moved there years agoI notice the switching of the MDS on my Warlock, it's quite annoying in traffic.
I live in the country so most of my driving is rural and it doesn't bug there.
Whenever I go to the big city (Ottawa) or the little village near my house, my truck stays in 8 cylinder mode.
It's a small percentage of my driving, can't be any worse than those that tow.
And, it's much more fun to drive with 8 cylinders.
.
You must not have an exhaust.I can't hear the difference, unless putting around slow, with window open.
I have never really noticed it on or off. the light will come on the dash
truck is stock
That is one thing with old age , a lot of stuff don't bother me, have other things , sore joints . need to stop way more often, wife pissed because I can't hear her.
I do turn it off a bit when truck is cold to get the RPM's up a little, may not be a good idea?
1200-1500rpm around town.
Before I moved, with the older ones, a trip to town was 1 hr on the highway, and I had old trucks for work and short trips.
I will watch those clips, seen one before.
One question, all mine have been 5.7's, is there any difference with the 6.4 in the trucks?
You need a louder stereo,lolYou must not have an exhaust.
When MDS kicks in with the Carven it sounds aweful.
I'm hoping the "hear the wife thing" starts to kick in soon,she justs gets louder until i say i've heard her ,lol /
I think the 6.4's have mds,maybe once you get into the 3500's or heavier they don't,but i'm pretty sure the 2500's have mds
Some of the earlier trucks will set a code for improper oil viscosity,but it seems to be only the 2009's and very early 2010's that have that issue. Anything after that seems to have no issues with 5W-30 or 0W-40 weight oils.
In fact Ma Mopar says 5W-30 is okay to run in them if 5W-20 isn't available.
Calgary is close to 1/2 million larger then Ottawa and i hate driving it in,i even hate driving in Airdrie now as it's grown to close to 90,000 now,it was under 9,000 when we moved here 30 years ago,and it's not the same city it was back then,aarrgghh,lol.
I own land in Saskatchewan and it's looking better all the time,even being in the middle of buttfluck nowhere.If my wifes family wasn't still in Calgary and Airdrie,we would of moved there years ago![]()
But not lubricated enough, is the issue.
Indeed! Upgraded exhaust and stereo sounds like a prettyYou need a louder stereo,lol
My sentiments exactly!Indeed! Upgraded exhaust and stereo sounds like a pretty
awesome package deal!