Re: [Amc-list] 1956. Oil Filter Trivia

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: Tom Jennings <tomj@xxxxxxx>
" 
" On Mon, 16 Apr 2007, Sandwich Maker wrote:
" 
" > except for cams and tappets.  modern engines don't have flat tappets,
" > and over on the strokers list several people have had cam failures
" > - and 2nd hand reports of others - we're beginning to attribute to
" > low/no zddp in modern oils.
" 
" Have modern engines really abandoned flat tappets so universally?

pretty much, afaik.

" I know the Jeep 4.0 isn't cutting-edge, but is it considered
" so old that oil isn't mad for it any more?

it's beginning to look as though you have to shop for it, eg. make
sure it is both 's' and 'c' rated.

" The strokers list experiences might not be totally normalizable;
" they're modding engines, right? With cam changes? Stronger
" springs, bigger lifts?

all over the map.  there are folks running the stock 4.0 cam and at
least one running a 258 cam.  the aftermarket ones do seem to be
faring worse and that may be the result of higher spring pressure, but
those who've followed the muscle car clubs and mags say this has
exploded as a problem only in the last decade or so, coincident with
reduction in zddp.

" Can't some of the oil-analysis services determine some of this
" in post-mortems?

i don't recall if it was cited, but i wouldn't be surprised if the
magazine articles that covered this have had that done.  i'm not sure
how else the finger would've gotten pointed at zddp to start with.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh@xxxxxxxxxxxxxxxxx                       and think what none thought
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