[AT] Questions on a 1975? Allis 7030 and 7050
Cecil Bearden
crbearden at copper.net
Mon Jul 12 08:12:15 PDT 2021
Steve.. :
I think that is what I meant. There is just not enough room inside a V
Block to get the stroke for the torque that an inline six can
provide. However, when you take a 6 cyl pver 2200 RPM you induce
either vibrations in the rotating parts, or something in the mechanical
fuel pump and injectors that goes haywire. Perhaps the pulses in the
injector lines creates waves that get out of time. When Cat came out
with the HEUI system engines could go to higher RPM. I think that is
because the injectors could work faster and the fuel was taken to so
much higher pressures. The HEUI injectors are compressing the fuel right
at the cylinder. A V style engine could run at a much higher RPM due to
the HEUI system. I am not a big fan of a computerized system, but the
7.3 Power Stroke engines were some of the greatest in my opinion.
Cecil
On 7/12/2021 7:52 AM, Stephen Offiler wrote:
> 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
> <mailto: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>
>> <mailto:crbearden at copper.net>
>> Date: 7/10/21 9:23 AM (GMT-05:00)
>> To: at at lists.antique-tractor.com
>> <mailto: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 <mailto: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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