Flash
NAXJA Forum User
- Location
- Evanston Wy
1bolt said:I'd say this has pretty much solidly been attributed to the lower ZDDP in current oils... At least that the best theory so far. It's interesting that the failures tend to happen 15 or 20k miles down the road, after the cam break in additives supplied with the cams have been changed out a time or three. Both Crane and Comp cams have been called into question, I believe most of that is simply the fact that they are two of the most popular makers.
There are no roller lifters for the 4.0, although some on the strokers yahoo group have gotten some Mopar V8 roller lifters to physically fit inside, none have been run due to the lack of a roller cam. Roller lifters will eat a normal cam.
Joe Gibbs racing makes extremely expensive oil for racing, it has little to no detergent, and is thus, a bad idea to run on a street engine.
That goes for basically all race oil's as they are formulated for engines that will be torn down regularly.
One of the additives you're thinking of is GM EOS which can be added at every change to boost levels of ZDDP. EOS is now being marketed under the AC Delco flag and is probably going to be available at parts stores instead of just GM service counters. This info is direct from the strokers list, which seems to be on the cutting edge of issues like this.
1Bolt,
I Just need to clarify one thing, the Roller Lifter that have been figured out and fit in the 4.0L are designed for a AMC V8 not Chry.
Flash.