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[quote user="YoHo1975"]That's a little unfair to the 710 Engine design and I think a little overly Rosey on the GEVO. [/quote] Could you explain why it is unfair, please? EMC once choose the two-stroke design as it promised the lowest weight per horsepower ratio. Later it was developed for higher horsepower and then fuel economy. The 710's underlying design is nevertheless approximately 80 years old. GE realized that it would be possible to make the FDL Tier 2 compliant but at the cost of fuel economy and not much development potential for further emission stages. So they developed an engine with the focus on emission reduction and fuel efficiency. I think that tells themain differences. The Gevo Tier 4 has development potential for stricter standards, the 710 not. EMD didn't switch to a four-stroke design because it was impossible to get the 710 Tier 4 compliant. It was impractical loosing too much fuel economy. When EMD decided to try the 710 for Tier 4 they lacked the money to develop a new engine other as GE. With Caterpillar as new owner that changed that and might have influenced the decision for the 1010. I haven't found a discussion of the two GEVOs. What I remember, the GEVO Tier 4 has EGR, two instead of one turbocharger (12 cylinder), higher firing pressure, and better computer engine control. Regards, Volker
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