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Old 10-17-2008, 12:41 PM   #24 (permalink)
kimer6
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Join Date: Oct 2008
Location: Carson City, Nv
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Diesel Metro Driving Impressions 900cc Kubota

I put 90 miles on the car yesterday using back roads, freeway, and flat areas. If you want an honest impression of how gutless it really is, drive your Metro and shift at 2100 rpm. That is all of the power you have to play with.

The governor is also something I don't like. At lower engine speeds the engine responds with very little input to the gas pedal. Nice. But in 5th as you approach 65mph at 3600 rpm and and governed engine speed, the gas pedal has to be mashed to the floor at all times.

On mild country roads with low hills it is a pleasure to drive. This diesel loves the 5th gear and 45 to 55 mph. Very little input is needed on the throttle. The engine is quiet, lightly loaded, and and seems like it will run forever on minimal fuel.

First gear is useless above 10mph. Let out the clutch and it is time to shift to 2nd before the governor cuts in. 3rd and 4th are the only gears where it is possible to actually use the gears before somebody starts tailgating. It is interesting to note that you can push the clutch in with the gas pedal to the floor and it NEVER gets above 3600 rpm. So I tried going thru the gears while holding the pedal to the metal....it sounds, feels, acts like an automatic transmission!

OK, I thought I had a Swift transaxle with the taller gearing. Right now I suspect that I don't. Whatever I have is taller than a stock Metro convertible final drive. This engine could certainly use the tallest gears. It is nice to have torque over a broad range.

Black smoke was a huge problem. It came and went at all different operating speeds and loads. Horses at the side of the road started coughing when I went by. I suspect that the injector tips are coked up or worn out. I remember seeing the one exhaust port with a 1/16" thick coating of dry soot.
I even have a catalytic converter installed near the exhaust manifold and it still trails clouds of black smoke. I took the air filter out and it still smoked. I'll swap the injectors from the spare engine and get at the cause of the problem. The soot comes from incomplete combustion due to poor fuel atomization. Injectors!

Lastly, there is no throttle valve in a diesel. The intake manifold goes from air cleaner to intake valves with no restriction.So there is no vacuum to operate the power brakes. I thought I was clever and used the vacuum from the engine mechanical fuel pump suction port (the engine pump is no longer used) to give the power assist about 10 inches of mercury vacuum. Not enough! The brakes are not adequate for normal road driving. I need to add another vacuum source and possibly a storage tank.

Getting back in my stock gas Metro convertible was an amazing transition. It had all the power I could ever want! Keep ya posted....Kim
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