Re: IML: 1961 oil preasure should I be concerned

["Burton Bouwkamp" <northburt@xxxxxxxxxxx>]

Our (Chrysler engineers) rule of thumb was any pressure at idle is enough.

 

At 60 MPH you should get at least 40 psi. On my 1968 Dodge Charger I had to go to 50 weight oil to get 40 psi at 60 MPH on a 90 degree day. With 30 weight oil I only got 20 psi at 60 MPH. That didn't hurt the motor but it worried me.

 

If oil is being thrown out the breather you have high crankcase pressure from piston ring "blowby" or inadequate crankcase ventilation.  

 

Burt Bouwkamp

----- Original Message -----

From: Mark Battesby

To: mailing-list@xxxxxxxxxxxxxxxx

Sent: Tuesday, March 13, 2007 12:55 PM

Subject: IML: 1961 oil preasure should I be concerned

My 1961 oil preasure gage has always on the low end. It has never even read dead center. I have had the car for 15 years and rarely drive it , and it runs good. But now it needs to be my main and only car to get around. Im curiose if  the preasure is low why then does oil blow out threw the breither  cap . Wouldnt that appear to prove that there is plenty of preasure? What is the normal amount of preasure on the oil for this 413 wedge moter? Als the car does not ever over heat wouldnt low oil preasure tend to heat the moter up ?