<div dir="ltr">Heavy-duty diesels are typically designed for high "torque rise" which is a torque curve peaking at low RPM and dropping significantly from there to the rated/redline RPM. This creates an engine that responds to increasing loads by slowing down a bit which puts you onto a higher-torque portion of the curve. Most of this characteristic is obtained with cam profiles, compression ratios, and bore:stroke ratios. None of the torque rise characteristic depends directly on the cylinder configuration. In fact the inline-6 is the smoothest possible configuration with perfect primary and secondary balance. Larger bores will produce higher torque from a given combustion pressure, which means larger/heavier pistons, and the inline-6 is kind of a neat way to "cheat" and get a smooth running engine despite the large heavy pistons. I guess I'm saying engines built for torque may end up being inline engines, which is the converse of what Cecil said.<div><br></div><div>SO</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jul 10, 2021 at 8:53 PM Cecil Bearden <<a href="mailto:crbearden@copper.net">crbearden@copper.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>2200 RPM is the top RPM of an inline diesel. Inline engines were
built for torque, not speed. I think part of the problem was the
mechanical pumps. at high speeds the fuel in the injector lines
sets up waves and misfire resulting in bent rods, burned pistons,
etc. HEUI helped to solve that. That 426 engine is a great
engine in the 7030, at 136 hp...<br>
Cecil<br>
</p>
<div>On 7/10/2021 5:45 PM, magreer67 wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">Ditto that on the AC 8070. My brother in law has
one and the 426 in it was a problem child engine. He repowered
it with an 8.3 Cummins and now it has plenty of power and is
finally reliable.</div>
<div dir="auto">Mark Greer </div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div id="gmail-m_-5297972876903281733composer_signature" dir="auto">
<div style="font-size:85%;color:rgb(87,87,87)" dir="auto">Sent from my
Verizon, Samsung Galaxy smartphone</div>
</div>
<div dir="auto"><br>
</div>
<div><br>
</div>
<div dir="auto" style="font-size:100%;color:rgb(0,0,0)" align="left">
<div>-------- Original message --------</div>
<div>From: Cecil Bearden <a href="mailto:crbearden@copper.net" target="_blank"><crbearden@copper.net></a> </div>
<div>Date: 7/10/21 9:23 AM (GMT-05:00) </div>
<div>To: <a href="mailto:at@lists.antique-tractor.com" target="_blank">at@lists.antique-tractor.com</a> </div>
<div>Subject: Re: [AT] Questions on a 1975? Allis 7030 and 7050
</div>
<div><br>
</div>
</div>
<p>Steve:</p>
<p>I noticed that and it is the same tractor up to 200 hp with
turning up to 2550 rpm and the intercooling. The 8070 gave
Allis a bad name as the engines were coming apart at the higher
RPM around here..<br>
Cecil</p>
<p><br>
</p>
<div>On 7/10/2021 5:17 AM, Stephen Offiler
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">I know nothing about these tractors, Cecil, but
got curious enough to check Tractordata. The 7030 is listed
as turbocharged while the 7050 is listed as turbocharged and
intercooled. Looks like they turned up the turbo boost.
<div><br>
</div>
<div>SO</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">On Fri, Jul 9, 2021 at 6:58
PM Cecil Bearden <<a href="mailto:crbearden@copper.net" target="_blank">crbearden@copper.net</a>> wrote:<br>
</div>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">
<div bgcolor="#FFFFFF">
<p>Just a note, the 7060 is the same tractor, but shows
192hp.. <br>
</p>
<p>Cecil<br>
</p>
<div>On 7/9/2021 4:40 PM, Cecil Bearden wrote:<br>
</div>
<blockquote type="cite">
<p>I have a 7030 Allis that needs a power director
clutch seal even though it still runs and pulls. A
friend has found a 7050 of about the same year.
Tractor date shows the 7050 having 156+Hp and the 7030
130+/- hp. The engine is the same 426 cu in engine.
Both engines are turning the same 2300 rpm. Did they
turn the pump up? My old 7030 will leave a smoke
plume that can be seen 5 miles away!!! Maybe the pump
was turned up on it. I think I might get the 7050 and
just switch some tires & wheels. That 426 engine
os a real stump puller. I wish I could put it in a
truck somehow... <br>
</p>
<p>Cecil<br>
</p>
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