'64 4 cyl 4000 gasoline fuel economy question

riveroadrat · May 28, 2017

This message is a reply to an archived post by soundguy on January 04, 2010 at 12:13:43.
The original subject was "Re: 64 4 cyl 4000 gasoline fuel economy question".

Just my 2cents. I used to bushhog with my fathers 800 tractors and noticed that the gas engine wanted to bog at lower RPM than the diesel. I believe it is due to the very heavy flywheel on the diesel versus the lighter flywheel on the gas. A heavy flywheels turning torque is not easy to choke down. I wonder if you could put a diesel flywheel on a gas engine, bolts might not line up though.

Ultradog MN · May 28, 2017

I'm less familiar with the 4 cylinder tractors but am pretty sure the flywheels are the same on gas and diesels. They are on the 3 cylinder Fords.

riveroadrat · May 28, 2017

The diesel flywheels are about 50 lbs, hard for me to lift by hand anymore.

RBnSC · May 28, 2017

UD is right they are the same. Diesel has more power seems to me. My brother has a diesel and I have a gas. No comparison.
Ron

Fordfarmer · May 28, 2017

The gassers are rated about 3 h.p. higher. I imagine the diesel's torque curve is a bit flatter, and peaks at a lower rpm.

JDEM · May 28, 2017

I don't know anything about the flywheels - but a gas engine will always out perform a diesel if they are the same bore X stroke X aspiration. 172 Ford diesel makes 141 lbs. of max torque @ 1200 RPM. 172 Ford gas engine makes 156 lbs. of max torque @ 1200 RPM.

Ultradog MN · May 29, 2017

These are from an original dealer spec sheets on the early 3400 and 4400s.
They were still putting 192 gassers in the 4400 and a 158 in the 3400 then - vs 175 and 201 diesels.
Proves your point pretty clearly.

Dean · May 29, 2017

Nebraska Test #701, June 6-17, 1959, Ford 881 Gasoline. 46.16 Max PTO HP at 2,200 RPM.

Nebraska Test #705, June 28-July 2, 1959: Ford 881D: 41.36 Max PTO HP at 2,200 RPM.

Both tractors equipped with 172 CI, 4 cylinder engines operating at same rated RPM.

Dean

wisbaker · May 29, 2017

I took some of the Agricultural Engineering Courses when I went to Michigan State University, they taught us that a naturally aspirated diesel engine will generally have a lower horsepower output per cubic inch of displacement. Only you start adding turbochargers and intercoolers does the diesel develop more horsepower per cubic inch. However if you add the same technology to the gasoline engine they to will also increase specific power output. Diesels are generally more fuel efficient and have flatter torque curves and develop peak torque at lower RPMs which may be what the original post was commenting on, the diesel tractor develops peak torque at a lower RPM and has more torque at lower RPMS than the gasoline engine.

Dean · May 29, 2017

Bingo.,

This, along with fuel economy, is why most industrial, farm, OTR HD truck, etc., engines are diesels and most automotive engines (along with manufacturing costs) remain gasoline.

Of course, if you're VW, you can have the best of both worlds (for awhile, at least). Sorry, I couldn't help myself.

Dean

'64 4 cyl 4000 gasoline fuel economy question

riveroadrat

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Ultradog MN

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riveroadrat

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RBnSC

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Fordfarmer

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JDEM

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Ultradog MN

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Dean

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