[Amc-list] E-85 Engine design (seats)

["Bruce Hevner" <scramblr@xxxxxxxxxxx>]

>AMC never used hardened seats in any engines. Well, I don't know about
the 2.5L four, but I would think not >since the 4.0L never got them. My
understanding is the slightly tougher castings allowed induction
hardening of >the entire lower surface of the head, valve seats,
combustion chamber and all. That would have occurred on >roughly 78 and
later engines though. I don't know if hardened seats are a requirement
for E85/alky, but most >likely is due to no lubricating qualities. Doubt
it's any worse than unleaded gasoline though.

Where in the world did you get that?? Don't confuse E85 with LP.
"Induction Hardening" is a localized area type of treatment typically
given to the Exhaust seats as a cheaper way of treating the seats
compared to installing replaceable seats. I have done a LOT of headwork
in 40 years and never seen a head where the entire lower part of the
head is treated. That would make no sense operationally OR financially
as the only place you really need it is the Exhaust seat. That would
make the ENTIRE lower half of the head hard!! Maybe there are engines
that have it,,, I've never seen it,,,
Now I HAVE seen engines that will wear the Intake seat too (old 390
series Fords are one example) but they are pretty rare and usually in HD
applications.
MOST manufactures started treating Exh seats in the mid 70's and most
all engines had them by 1980. Aluminum heads are exempt since all of
them have replaceable seats and most are hard enough to work OK,, even
on LP. 
There are NO different requirements for valves/seats when using E85 than
Regular Unleaded fuel that I am aware of or have seen. Here's some real
world evidence,,,
http://www.youtube.com/watch?v=I-MNQFlRilE&feature=related
And I STILL think Butanol is a better fuel,,,,
But HEY,,, that's just me!
Bruce Hevner

    
 
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