GROOVED TAPPET - SEE PHOTOS
Posted: Tue Apr 18, 2006 6:44 pm
Steve this may be the answer to your tappet failure-
Don't use Mobil 1! It has nothing to do with dino vs syn. - It has to do
with the fact that the new SM grade oils (especially Mobile 1) are missing
friction modifiers (a zinc and phosphorus compound called zinc dialkyl
dithiophosphate (ZDDP)) that are being left out to meet emissions
goals. Our old direct "cam on tappet" engines need these ZDDP friction
modifiers.
There is a very relevant article in June's Hot Rod mag titled "Cam Info You
Need, Why are flat-tappet cams getting wasted more frequently these days?
You'll be surprised by the answer. " page 124. (Some of the article
photos look a lot like yours.)
Suggestions include using Racing Oils, using light duty Diesel Oils like
Rotella, using a friction modifier additive and hoarding non-SM oils.
-Marc
At 07:46 PM 2/5/2006, you wrote:
Don't use Mobil 1! It has nothing to do with dino vs syn. - It has to do
with the fact that the new SM grade oils (especially Mobile 1) are missing
friction modifiers (a zinc and phosphorus compound called zinc dialkyl
dithiophosphate (ZDDP)) that are being left out to meet emissions
goals. Our old direct "cam on tappet" engines need these ZDDP friction
modifiers.
There is a very relevant article in June's Hot Rod mag titled "Cam Info You
Need, Why are flat-tappet cams getting wasted more frequently these days?
You'll be surprised by the answer. " page 124. (Some of the article
photos look a lot like yours.)
Suggestions include using Racing Oils, using light duty Diesel Oils like
Rotella, using a friction modifier additive and hoarding non-SM oils.
-Marc
At 07:46 PM 2/5/2006, you wrote: