Forum Home Forum Home > The Garage > AMC V8 Engine Repair and Modifications
  New Posts New Posts RSS Feed - High Performance Engine Oil
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

High Performance Engine Oil

 Post Reply Post Reply Page  <123
Trader View Drop Down
AMC Addicted
AMC Addicted

Joined: May/15/2018
Location: North America
Status: Offline
Points: 1225
Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Feb/11/2019 at 9:32am
I am finding hard to get a current specification on the Penngrade 1. As 304-Dude points out the manufacturers are changing packaging and formulas all the time.
The ksi or psi pressure rating of the oil is very important. But a 60's to 80's "muscle car" has typically 100,000 psi contact pressure between cam lobe and lifter. Add higher load springs and the pressure rises proportionally.
 Modern overhead cams alleviate these high pressures by eliminating the the valve train friction/multiplication and increasing surface contact area. More area and proportionally less load.

The ZDDP is an anti scuffing compound that embeds into the steel. High load pressure oil is tested by direct pressure before it allows metal to metal contact. A camshaft rotates and is wiping oil off the lobe as it ramps up to maximum lift. High shear rated oil will resist oil wedge dispersion. The anti scuffing compound is to keep the separation of metal to metal contact IF the oil wedge has been removed. 

Yes, use the higher pressure rated, high shear rated oil. If you have modified your engine with higher valve lift, best go for oils with known higher ZDDP or invest in a roller cam setup.
Back to Top
304-dude View Drop Down
AMC Addicted
AMC Addicted

Joined: Sep/29/2008
Location: Central Illinoi
Status: Online
Points: 7540
Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: Feb/11/2019 at 9:56am
They guy who is doing the oil tests, points out cam lobe wipe out even on high additive oils.

His rule of thumb is the lowest weight oil that does not drop oil pressure for the engine build.

Also some of the higher rated oils dont have additives, but he does test various oils with additives added.

Its quite a read, and can make oils a bit clearer to understand and decide on for personal use.

Not saying what oil is over kill... just be aware, to use a race oil on a street car, the benifits may never be seen on your daily driver, while many over the counter oils are just as good until the heat range becomes at the upper scale and beyond of operation.

Outside of an oil presure gauge, a good oil temp gauge is just as critical for monitoring your engine's operation.

Only if the guy would shortened up his expertise and opinions, to allow the bits of information to be more clear in facts finding.
71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
Back to Top
LakesideRamblin View Drop Down
AMC Addicted
AMC Addicted

Joined: Dec/21/2015
Location: So. California
Status: Online
Points: 1893
Post Options Post Options   Thanks (0) Thanks(0)   Quote LakesideRamblin Quote  Post ReplyReply Direct Link To This Post Posted: Feb/11/2019 at 12:52pm
Lucas SAE 10W40 (10683) Hot Rod & Classic High Zinc Engine Oil.  Run in my 360 street motor.  Not a straight race engine but beefed up.  I am in a mild So. Cal. climate but it works great with no issues after 1 1/2 years and I pound the thing.  Maybe the high zinc content is the key?

Edited by LakesideRamblin - Feb/11/2019 at 1:00pm
69 Rambler 220 360
73 Javelin 360
"If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt
Back to Top
 Post Reply Post Reply Page  <123
  Share Topic   

Forum Jump Forum Permissions View Drop Down

This page was generated in 0.094 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
If you have problems logging in or registering, then please contact a Moderator or