Heck, retrofit cars and trucks currently on the road, that are in good-great condition, but with gasoline engines, and 50k to 100,000 miles on the odometer. Many domestics since 1996 also do not have great reliable engines or transmission(there are exceptions, like the ford F-Series), with many GM models prime examples. Combine modern clean turbodiesels (or future Bin2Tier5 diesels) with 5/6 speed transmission, and you just kicked fuel economy up 25-35% from previous gasoline engined figures. It could help companies recoup their diesel R&D and manufacturing retooling costs quicker. A variety of engines and transmissions would have to be offered.

You don't have to change the suspension just to do a simple engine swap, especially if you were removing horrible V6's such as GM's 3.1 - 3.8 liter Iron Dukes and putting in modern 4-cylinder turbo diesel engines. Worst case, going to a higher or lower rate front spring is about all you'd have to do. I've seen motor swaps of all sorts, even guys putting V8 engines in Mazda RX7's that had 1.3 liter rotaries. It's not rocket science.

I'd say Yes. Most EV rebuilds like those profiled in Homepower are heavy and have a limited range.

I like going 2-3 weeks between fillups on my Jeep CRD.

You have been misinformed concerning engine swaps. Any engine swapping must use the same year or newer engine and must still go through emissions testing. Only off-road (race only vehicles, etc) are emissions exempt.

A LS-1 V-8 isn't really that much heavier than a twin turbo RX-7 drivetrain, but the additional torque must be managed. The 350Z's 3.5L V-6 is heavier and larger than a 5.7L LS-1.

Would be encouraging to see a retrofit "rebate" as proclaimed in Germany (Dec.3 post)

Ian, the batteries of PHEV's aren't necessarily heavy.  Also, reducing the required size of the engine to e.g. a 1.3 liter turbodiesel would subtract a great deal of weight.

They will allow me to swap out a clean but gas-guzzling gasser for a dirty but frugal diesel. At least for LDVs, which I believe Allen was referring to, and which was what I was referring to. My apologies for an miscommunication on my behalf.

HDVs go through opacity checks annually, and can be checked at weigh stations/checkpoints/etc... for excessive smoke since they represent the majority of diesel powered vehicles in the state, but since the LDV diesel segment is relatively small, CARB decided that it wasn't worth monitoring via smog checks testing opacity. By limiting the sales of new diesels, they've effectively limited diesel emissions from the LDV segment to the point where they don't feel they need to worry about it, and the DMV's regulations regarding these swaps reflect that.

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