>I would like to add my $.02.
> If you START at say, 6:1 comp and go to
>7:1, is a higher octane gasoline really needed?
> We were told to place small wads of "Playdo"
>on the tops of the valves, install head with the
>gasket you'll be using, and carefully rotate motor ( if it will!).
>Remove head and see how far the valves squashed the playdo (clay,
>whatever). Atleast .060" clearance?
Exactly. Do they still make Playdoh?
I went from 8.0:1 to 9.2:1, so I go for the higher octane, to be safe. I
have heard you can use pump gas (premium) up to 9.5:1, but I don't trust
this fuel today....
> Milling the head also creates a flow problem
>across the top of the block. That's why many
>were "relieved" or metal removed from the top
>of the block between the valves and its cylnder.
> This stuff is getting so rare that I guess relieving might be a bad
>idea.
Yeah, you have to hassle with the valve seats and stem length, and worrying
about the top of the piston coming up over the top of the deck in some
instances...with V8's you have to refit the intake manifold sometimes...
> As far as ANY four cylinder being down on power, I guess you haven't
>noticed the late-model Honda Accords JUST TEARING UP THE STREET! I'm
>not a Honda fan, but I do have to work on them. They're setting low ets
>at dragstrips all over the country. These things are going faster than
>Big Daddy Don Garlits and his first hemi-powered (Swamp Rat?)
>dragsters!!!!
> No, I don't suggest you put a Honda engine in
>your jeep. I just wanted to remind you about
>their power.
That's true, dual overhead cams, 4 valves per cylinder, TPI, computer
controlled fuel and spark, among better flow design in a lighter weight and
aerodynamic vehicle. I was thinking of the basic 4 banger that could be a
replacement, like from a newer Jeep.
> Asking a flathead four or six to push your vehicle around like a new
>car or truck is just
>not reasonable. They've got so many design limitations to overcome.
> However, I try to drive my ancient stuff as often as possible, I like
>the reaction I get
>and the satisfaction from keeping these things
>going!
>Don
These older vehicles are not really good daily drivers, unless you can
commute on roads of 45mph or less.
Lisa
>
>
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This archive was generated by hypermail 2b29 : Sun Sep 02 2001 - 11:15:37 PDT