M670 Super Diesel

ChrisQ

Member
I have a 1966 M670 Super Diesel that will need to be overhauled. I just picked up a M&W turbocharger set up for on this tractor. From reading though the archives, it doesn't sound like the turbo will wake them up much. This tractor is more or less a toy to mess around with. I think it would be really fun to have a 670 in the 120 horse range. I won't be plowing with it weeks on end or taking it to a tractor pull every weekend; however, I would like it to be a reliable motor that will hold together a couple thousand hours. That being said, would the 336 diesel crank hold up to being offset ground to a 283 rod to bring the stroke up a little? Or would this just be a recipe for a rod taking flight? I have lots of parts, including a 403 crank, but with the 403 crank and short blocks I would have to use 4.81 pistons which I'm guessing won't take the abuse. I suppose I could use a 403 crank, rods, and 403 blocks but then everything gets very tall under the hood. I am just brainstorming out loud. I'm sure some of you guys have a lot more knowledge over this than I do. Like I said, it is a toy but might cut hay and go plow for an afternoon and end up on a swing hopper so reliability is a big factor.
 
A lot depends on compression and turbo
boost. Too much compression with a
lot of boost can lead to meltdown
under extended high load conditions.
Too low compression and boost will do
little to no improvement in power.
Need to do some detailed research to
make a decision.
 
The problem with getting power out of
these engines is the heads. Even if you
increase displacement, you will not gain
much power without it breathing better.
I don't have any answers of what needs to
be done, but I have some ideas I'm gonna
try one of these days.
 
283, 336 are both 5" stroke. G crank is the
way to go. Like was said, almost all lanova
cell combustion chamber heads are engineered
for very specific applications. NOT for high
performance.
 
I have heard that Moline diesel heads do not flow very well and that lanova style injection doesn't hold a candle to direct injection when it comes to performance. I would like to gain a little with it though. I would like to think the turbo, along with a little port work, would help the breathing issue so it could have a little more displacement. I'm not sure what the M&W turbo will put out for boost, I don't think its very much. Compression I would prefer not to mess with much. I appreciate your help guys. I know how to put engines together, but am completely new to performance modifications. I know there is much more knowledge here than I have, and its a lot cheaper to learn from you than my own mistakes. Next question I have is has anyone messed with getting the compression ratio of a 336 or 504 closer to that of a 451 to make them start better?
 
Find some G900 451 diesel heads. They are
nearly a point higher compression. I have a
set of 4-3/4" MW big power series pistons
I'm planning to install in my UB special.
Stock is 4-1/4" but I will use original 4214
heads to start with, because the ratio will
be up anyway. Good luck!
 
If adding a turbo, you really don't want
to raise the compression any. Make sure
you have plenty of intake valve clearance.
The intakes close really slow and can hurt
your starting.

You really need to have a dyno to
understand these engines. There is no
torque curve. It is essentially flat. I
have come to believe they were designed
with the poor air flow on purpose. Its
what creates that incredible lugging
ability.

On my 504 I was able to pick up 13 hp just
from intake mods, before the manifold.
 
The flat torque curve comes from the slow burn of the energy cell. The fuel burns and expands slow, keeping a steadily increasing pressure on the power stroke. Direct injection relies on one big bang (noise) then the following expansion of the burnt gasses to push the piston down. Most all manufacturers in the 50's used some kind of pre chamber, or lanova chamber to utilize engine components designed for gasoline engines (cranks,rods,cams,crankcases). due to the slow quiet burn of the energy cell, combustion is not as harsh on the bottom end as direct injection. The 585 utilizes a similar (quiet diesel) chamber design, as does the herculese engine in oliver and white tractors.
 

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