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1. Getting a used 6.5 diesel and computer package will cost a ton of money and will have a crapload of miles on it. Repairing a 6.5 costs almost triple what the equivalent gas motor would cost.
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I can get a 6.5 with under 200k with computer for under 3k just about anytime. Around here they are fairly common. Just put one in my dad's truck, the motor had 108k and cost 600 dollars.
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2. The V6 he chose has twice the power and torque of the 6.5
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I do have to say I'm surprised that the chevy v6 makes over 700 foot pounds of torque. That's more than the new Z06 Corvette's torque. Very impressive for a v6... unless you are mistaken on your numbers.
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3. The gas cost for gas vs diesel here in Virginia is 1 dollar / gallon. So with both engines getting theoretically the same gas mileage, the gas version would cost less every fill up to drive.
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Very true, but there is a lot of flexibility in diesel sources.
I'm just saying it is cheaper and easier to do the swap and put him right near where he wanted to be. I was just curious what his reasoning was. It's his equipment, so if he wanted to put a 50cc moped motor, that's his thing. I like hearing the why's as I do a lot of conversions, tinkering and thrashing so I can add the considerations to my own. I don't believe anyone is "wrong" to put it together any way they want. As a gearhead I enjoy hearing the process.
Personally, I put a Cummins 4bt in my ramcharger, but the engine is so tall it doesn't work well at all for cars but it's built for work, not for commuting. Though I do know a guy that put one in a 49 merc and got high 30s, but the engine bay was tall enough.
True the 6.5 is heavier, but it will also likely outlast the v6 by quite a margin.
I just like getting to my goals in the most optimal fashion. The "burn cleaner" aspect isn't a concern of mine beyond making sure that I'm not wasting fuel.
VW ruined me on TDI's from the parts availability and costs. Cummins is cheaper... and that's saying something. When they are running right though, they are cool engines, but too small for my applications.