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Old 02-21-2008, 01:51 PM   #1 (permalink)
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Corvette V8 diesel conversion - 40 mpg (US) avg.

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Some may wonder why I did this - install a 6.5L diesel in a Corvette. To put it simply - fuel economy. Not many cars can handle the weight, is streamlined, won't rust, yet retains its value, and is a sporty - fun car to drive.


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I installed the engine in May of 2001, and have driven it about 3000 miles since then. We average about 48-mpg Canadian (40 mpg US), and have seen a high of 55-mpg (46 mpg US).
More info & engine pic: The Diesel Page - Readers' rigs

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Old 02-21-2008, 02:50 PM   #2 (permalink)
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That is a pretty genius engine swap...talk about having your cake and eating it too!
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Old 02-21-2008, 04:16 PM   #3 (permalink)
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Very cool...
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Old 02-21-2008, 09:45 PM   #4 (permalink)
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I recently saw a diesel conversion of a 5th gen Honda Civic hatchback (the same age as my car), at least I assume it was a diesel converion. It had an official looking Diesel logo sticker in the location where the Civic CX/VX.DX normally is on the tailgate. I'm guessing they had swapped a Rabbit or Golf engine/transmission into the car.
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Old 02-21-2008, 10:00 PM   #5 (permalink)
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that is pretty amazing mpg for a V-8, even if it is diesel.
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Old 02-21-2008, 11:14 PM   #6 (permalink)
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They can do better with trans/gearing upgrades.
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Old 02-21-2008, 11:16 PM   #7 (permalink)
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Good point. I'm not sure what this means... did they upgrade?

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We're using a TH700R4 automatic with a manually controlled converter lock-up.
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Old 02-21-2008, 11:30 PM   #8 (permalink)
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Means it has a .70 4th gear overdrive. And they probably have a toggle switch or something on the dashboard to lock the torque converter.

700r4 is basically the older non electronic controlled version of what GM is using in current cars. I would guess it has 2.73:1 rear end ratio plus the .70 overdrive and probably 225-70/15 tires so it does pretty low rpms at highway speeds.
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Old 02-22-2008, 12:12 AM   #9 (permalink)
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According to that guess it's still at around 1250rpm@55mph. Good for a 4L engine, but still kinda high for a 6.5L lump. With something like 6+L idling down the highway at 55mph is probably the best bet.
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Old 02-22-2008, 07:08 PM   #10 (permalink)
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after reading that id be curious to see how the 6.2 diesel would do , or a powerstroke in a mustang

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