Re: [AMC-list] 195.6ohv, ARP studs and head torque

[tom jennings <tomj@xxxxxxx>]

On Mon, Dec 6, 2010 at 10:15 PM, Jim Blair <carnuck@xxxxxxxxxxx> wrote:

>
> If I could go back to high school, when we were casting aluminum heads and
> blocks (we made Chev ones and tested them in cars we built from junkyard
> wrecks) I would make a matching AL head with some redesigns for current
> technology and breath a little life back into that motor!
>

I spent a good 15 minutes fantasizing about that... :-) it's not completely
insane -- the pistons have this crazy tall "wedge" that rises well above the
deck, but you could fit flat-tops to the rods, have a penta or flat chamber
that some enterprising fool (it will not be me) could machine a head for. Do
external water plumbing instead of fitting to the block water jacket...



> Jim Blair, Lynnwood, WA '87 Comanche, '83 Jeep J10, '84 Jeep J10
>
> From: tom jennings <tomj@xxxxxxx>
> To: "AMC, Rambler, Nash, Jeep and family" <amc-list@xxxxxxxxxxxxxxxxx>
> Cc: amc-list@xxxxxxxxxxxx
> Subject: Re: [AMC-list] 195.6ohv, ARP studs and head torque
> Message-ID:
>        <AANLkTi=FEZ7FVAp7zKKrPcfhwWfhQ9crogz7u+1mYL-A@xxxxxxxxxxxxxx<FEZ7FVAp7zKKrPcfhwWfhQ9crogz7u%2B1mYL-A@xxxxxxxxxxxxxx>
> >
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>
> The more I think about that aluminum motor, the less I like it, i'm sad to
> say... it's bass-ackwards -- should have an aluminum head! it too will have
> the cooling problem the iron engine has, lucky that's an easy fix. NO WAY I
> would put that engine together without studs. The head design, truly doth
> suck. There's nothing good about it except mixture evenness which is about
> perfect. The combustion chamber is just stupid even for 1957.
>
> Most low-end rebuilders use a big belt sander to finish block deads and
> heads; I can't believe that would work well at all with those cast-in-place
> steel cylinder pairs. The siamesed cylinders probably change shape all over
> the place, and at least the top end of them is restrained by the deck in
> the
> iron engine.
>
> Something always fails first, right? For past-end-of-design-life failures
> the iron engine's headgasket failures are not THAT bad. The AMC 8's tend to
> heave bad oil pump cover wear, some of the early "new" sixes lose
> valvetrain
> oil (#4 cyl bolt), etc. These aren't faults in the engine exactly, they're
> just what happens for reeeeeally old engines (and AMC did fix up most of
> these things over the years) such that the later engines are no-brainer
> reliable.
>
> But recall that the aluminum six got a very bad rep for headgasket and
> coolant issues *within it's design lifetime* -- I would be very afraid of
> that., very afraid. Those design flaws need to be 100% identified at least,
> and likely all solved. They might not be fixable problems! (Well, for any
> $$$ you or I are likely to be able to spend.)
>
> Even if it's just a weekend putt-putt car, I wouldn't want to sink any
> money
> into a thing I couldn't trust.
>
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