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Old 12-31-2015, 09:10 PM
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combatpigg
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I don't have any experience but it's fun to speculate.

First of all, the Benchmark Engine in this class is any of the hot .32s like OS or Webra. With a tuned pipe they will put out 18,000 rpm with a 8 x 8 APC. That's pretty serious performance for $130 or so.

This should give you a point of reference to compare the $85 Evo .40 to.
In a typical model engine case it's pretty hard to increase stroke, so I'm guessing the Evo has an oversized piston. The engine may or may not have increased breathing capacity through the carb and the crankshaft compared with it's .32 sized counterparts. If not, it would be like taking a 300 HP 350ci car engine, installing a 400ci rebuild kit into it without increasing it's air handling capability and expecting to get much more than 300 HP.
What you end up getting with just the extra cubes is about the same HP but at a lower rpm.
If Evo made this transformation from .25 to .40 worthwhile they hopefully went the extra mile to get this engine to rev a 8 x 8 APC beyond 18,000 on 15% nitro.