Re: [AMC-list] so that's why I did this!!!

[tom jennings <tomj@xxxxxxx>]

Well I think the small Carters and Holleys these motors get are a bit
smaller in CFM than we've been assuming. I figured they were good for 200,
250 cfm but I bet it's closer to half that effectively. The bore is about
right, but the metering is primitive.

I realized some time ago that the other reason for multiple venturis is that
the range of velocities that a single venturi can decently handle is not
that broad. You can't expect such a thing to work from 50 cfm to 500 cfm or
whatever. Especially older ones are probably good over a very narrow range
of flows, probably right where we all know the seat of our pants tells us it
is, like Bruce's recent 50 mph neat highway cruise.



On Mon, May 17, 2010 at 1:06 PM, <wrambler242@xxxxxxxxxxx> wrote:

> Neither my iron, nor my Aluminum six would see the other side of 4,000 rpm
> with single barrel.
>   The two barrel twin stick would do about 4200 on a downhill long stretch
> and that was it. It was like driving a uhaul with a rev limiter.
>   You'd think downhill, but that standard shift would not let it. It sped
> up if I pressed the clutch pedal down.
> Sent from my BlackBerry® wireless device from U.S. Cellular
>
> -----Original Message-----
> From: Frank Swygert <farna@xxxxxxx>
> Date: Mon, 17 May 2010 12:03:10
> To: <amc-list@xxxxxxxxxxxx>
> Subject: Re: [AMC-list] so that's why I did this!!!
>
> I don't recall what rpm I ran my "built" 196 up to, but I DO recall what it
> would do stock. With the original 1909 1V carb on it it would only go up to
> about 3800 rpm in high gear flat out. I recall that distinctly! 126 hp @
> 4200 rpm, but it won't touch 4500 rpm in gear!! Might in first or second,
> but wouldn't in third on a level. Would run just a couple hundred more on a
> slight downgrade, drop a couple hundred on a slight upgrade. Raced a friend
> in his old Vega out in Idaho on a back road that was straight and level. I
> could get right behind him and could have pushed him in the draft, but if I
> pulled out to go around I couldn't! That was with stock exhaust and
> ignition. I later put the 2V on but didn't see what it would do like that.
>
> You'd think I would remember what rpm the later engine ran, but I don't.
> I'm sure it would turn 4000+, it was similar to what Tom has except for the
> Pertronix (standard points, hotter coil). I guess I remember that first time
> running it hard because I was a bit surprised it wouldn't run anywhere near
> the peak hp rating...
>
> -----------
> Date: Sun, 16 May 2010 19:25:47 -0700
> From: tom jennings <tomj@xxxxxxx>
>
> These were just upshift speeds, not sustained; peak then throttle up and
> shift. Funny, the thing that limits high upshift speeds in a practical
> sense
> is the T-96, the synchros basically suck. They are more like "suggestions"
> that the gears mesh, please.
>
> The "old" engine (same one before work-over) ran to 3000 OK, but it wasn't
> that happy doing so. Same ignition for now (Pertronix and epoxy coil) but
> good carb and much improved exhaust, but I think the new valve springs are
> the reason it didn't break up and grumble.
>
> I don't know what would limit practical maximum RPM for this motor. The TSM
> specs it as 138hp@4500, so we've been calling that "maximum". Valve float?
> The springs are pretty weak! Would valve float let a pushrod drop out?
> They're like foot long soda straws. Weird torsional vibration? Would
> anything like that happen to any modern-ish six below 6000+?
>
> I plan on not finding any of these things out, just thinking out loud. My
> budget isn't big enough to ask such questions. I am curious though.
>
> --
> Frank Swygert
> Publisher, "American Motors Cars"
> Magazine (AMC)
> For all AMC enthusiasts
> http://www.amc-mag.com
> (free download available!)
>
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