Seem to remember there's some mention of doing this in the "All American
Wonder" books
Do you want me to look it up for you Rob ?
Glenn
----- Original Message -----
From: aussierob <aussierob@odyssey.net>
To: Military Vehicles Mailing List <mil-veh@mil-veh.org>
Sent: Saturday, August 04, 2001 11:53 AM
Subject: [MV] HIGH COMPTESSION FLATHEADS ?
> Hello listers ...I'm looking for information on just what difference the
> Higher compression head makes to my jeep flathead. ???
> I have one of these heads that I might put onto my nicely running, new
> motor.
>
> Having driven this brand new engine now for several hundred miles, I have
> inherited "some problems" that a previous owner or two have created !!!
To
> add insult... I went ahead and put in an Warn overdrive.
>
> I know these sidevalve engines are not designed to operate at 2001 highway
> speeds ...however, the slightly larger tires definitely give me "more"
> speed (unfortunately, only up to a point)
>
> But, the Lil' flathead is really at the end of its rope to actually
sustain
> that performance up and down the backroad hills, forget the dual
highways.
>
> (By the way I got 15+ miles per gallon on a recent 120 mile run with the
new
> engine)
>
> Now the previous owner (or two) has changed the rear ends from what I
> "think" they said was a 5.6:1 ratio ...to a 4.1:1 ratio
> This would give me even more, more, top speed except that the Lil'
> flatheads are out of steam by the time you get to 50mph !!!
>
> Oh, I know some will write and tell me they easily get 60mph out of theirs
> ..true, and so do I ...BUT on the slightest grade your out of power.
> Why ?
> Because you're already at the top of this engines power abilities.
> Anyway, who wants to run their engine at totally full power while
running
> down the highway everyday ?
>
> That said, I do have my standard MB (nice running) ...so I DO have a
> complete comparison here.
>
> I would like to get a few more horses and a few more foot pounds of Torque
> Therefore, the Higher Compression head question.
>
> Basically the two changes to this jeep - larger diameter tires and the
> faster differential - both combined, actually by together, have created
an
> awkward situation where I have to slip the clutch too much to get the jeep
> rolling in first gear, then there's not enough power left at high speed to
> make too much use of it This is probably at the point where the Overhead
> valve engine shines - big time with it extra 12+ horse power ...eh ?
>
> I have, what I am told is this.
> One of my engines has the ribbed high compression flathead. So, just how
BIG
> a difference would this make?
>
> 1]
> So, Is there anyone out there that has run their jeep with the standard
> head and then switched over to the high compression head ...there must be
> someone who has felt the difference???
>
> 2]
> Anyone know the compression ratio of the standard head compared to the
high
> compression head.
> Sorry for the length of this post.
> Regards
> Rob Pearson upstate, NY
> 42MB and a handful of Cj2As and a DJ bitza !
>
>
>
>
>
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This archive was generated by hypermail 2b29 : Sun Sep 02 2001 - 11:15:37 PDT