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Re: 426 Hemi oil pressure flutter at mid rpm [Re: dragon slayer] #2819922
09/12/20 10:31 AM
09/12/20 10:31 AM
Joined: Jan 2003
Posts: 17,840
S.E. Michigan
ZIPPY Offline
I Live Here
ZIPPY  Offline
I Live Here

Joined: Jan 2003
Posts: 17,840
S.E. Michigan
That's great news. Something easy!


Rich H.

Esse Quam Videri




Re: 426 Hemi oil pressure flutter at mid rpm [Re: dragon slayer] #2819923
09/12/20 10:33 AM
09/12/20 10:33 AM
Joined: Jan 2003
Posts: 10,702
North Dakota
6PakBee Offline
I Live Here
6PakBee  Offline
I Live Here

Joined: Jan 2003
Posts: 10,702
North Dakota
Originally Posted by dragon slayer
One concern may be pickup too close to the pan? Recommendation is 3/8" or so, what is funny is the manual say to make sure pickup touches pan???? It is not, but clearance may be low. Can a pu too close to pan really do his. I hate to have to drop the pan, but seems odd to me since pickup design has a relieve so that even if on the pan, it should not inhibit flow to cause a loss of pressure?


I was told years ago that the "touching" recommendation was to prevent the pickup from getting into a harmonic induced vibration and breaking at the threads. I have only personally seen this happen once on a '66 Hemi Coronet with a deeper pan that the pickup failed in this manner. twocents


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: 426 Hemi oil pressure flutter at mid rpm [Re: dragon slayer] #2819933
09/12/20 11:01 AM
09/12/20 11:01 AM
Joined: Feb 2014
Posts: 1,696
central il.
S
second 70 Offline
top fuel
second 70  Offline
top fuel
S

Joined: Feb 2014
Posts: 1,696
central il.
I hope that is all it is. I had a similar case pop up out of no where. Everything was fine and after a high rev the pressure dropped from 75 to next to nothing at idle. Shut it down and let it sit and let oil drain back to the pan. Checked oil and added 1/2 quart and had 55 psi @ idle again??? When it ran for a while it would slowly lose pressure turned out to be the pickup was cracked where it screwed into the block and it would lose suction as more oil got stranded in the heads and the oil level would be under the crack. When full it was actually sucking oil threw the crack and keeping it from losing it's prime.


Mike

IMG_1245.JPG
Re: 426 Hemi oil pressure flutter at mid rpm [Re: second 70] #2820016
09/12/20 04:56 PM
09/12/20 04:56 PM
Joined: Aug 2003
Posts: 43,115
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,115
Bend,OR USA
One of those dreaded after market ones whiney down


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 426 Hemi oil pressure flutter at mid rpm [Re: Cab_Burge] #2820049
09/12/20 07:09 PM
09/12/20 07:09 PM
Joined: Mar 2006
Posts: 9,822
MI, usa
dvw Offline
master
dvw  Offline
master

Joined: Mar 2006
Posts: 9,822
MI, usa
Trust me I just chased my own small block oil pressure issue. (see post) If it were cheap and easy anyone could do it. The key is realizing you have an issue and correcting it.
Doug

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