[AT] Questions on a 1975? Allis 7030 and 7050

[Stephen Offiler]

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.

SO


On Sat, Jul 10, 2021 at 8:53 PM Cecil Bearden <crbearden at copper.net> wrote:

> 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...
> Cecil
> On 7/10/2021 5:45 PM, magreer67 wrote:
>
> 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.
> Mark Greer
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
>
>
> -------- Original message --------
> From: Cecil Bearden <crbearden at copper.net> <crbearden at copper.net>
> Date: 7/10/21 9:23 AM (GMT-05:00)
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] Questions on a 1975? Allis 7030 and 7050
>
> Steve:
>
> 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..
> Cecil
>
>
> On 7/10/2021 5:17 AM, Stephen Offiler wrote:
>
> 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.
>
> SO
>
>
> On Fri, Jul 9, 2021 at 6:58 PM Cecil Bearden <crbearden at copper.net> wrote:
>
>> Just a note, the 7060 is the same tractor, but shows 192hp..
>>
>> Cecil
>> On 7/9/2021 4:40 PM, Cecil Bearden wrote:
>>
>> 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...
>>
>> Cecil
>>
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