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MetroMPG 02-21-2008 01:51 PM

Corvette V8 diesel conversion - 40 mpg (US) avg.

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.


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

TomO 02-21-2008 02:50 PM

That is a pretty genius engine about having your cake and eating it too!

zjrog 02-21-2008 04:16 PM

Very cool...

basjoos 02-21-2008 09:45 PM

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.

budomove 02-21-2008 10:00 PM

that is pretty amazing mpg for a V-8, even if it is diesel.

roflwaffle 02-21-2008 11:14 PM

They can do better with trans/gearing upgrades. ;)

MetroMPG 02-21-2008 11:16 PM

Good point. I'm not sure what this means... did they upgrade?


We're using a TH700R4 automatic with a manually controlled converter lock-up.

Coyote X 02-21-2008 11:30 PM

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.

roflwaffle 02-22-2008 12:12 AM

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.

LibbyMetro 02-22-2008 07:08 PM

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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