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Old 04-22-2017, 11:00 AM   #14 (permalink)
Deep Lurker
Join Date: Sep 2016
Location: Central Florida
Posts: 53

Creepy Van - '95 Ford E150 Cargo
90 day: 14.59 mpg (US)
Thanks: 5
Thanked 30 Times in 22 Posts
The 300 I6 is pretty popular in dirt track racing due to it's huge torque curve and indestructible crank. It produces more torque below 1500rpm than a 351W, a basically flat 240ftlbs from 700-2000rpm! The biggest problem is that the cam and intake setup lose power drastically above about 2500rpm. Comp Cams makes a good option that runs up to nearly 5000rpm, but it does lose a lot of 1000-2000rpm torque. I'd like to get better efficiency at cruising highway speeds, where I'm usually running around 2500rpm. But with current gearing I couldn't make use of a 5000rpm redline. So at the moment I'm not planning to crack open the engine. I'll probably end up restoring a 1940s pickup truck before I do that...

The C6 is really tough, even in stock form. The downside is that it consumes a lot of power, and has no lockup converter. So even cruising at speed it's still sloshing around instead of engaging a clutch like the E40D. Unfortunately there's no way to add a lockup to the C6, but I could sacrifice some low end torque gain by putting in a "tighter" torque converter. This would probably raise my MPG by quite a bit, but reduce my low end towing capacity. I haven't looked into it too much yet, but it's an option!
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