Os 70

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06-18-2003, 12:16 AM

rocket19682

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Os 70

What is the difference between Surpass and Pre-Surpass 4s .70 engines. Is it just performance? Weight? I know it's probably a "dumb" question but I am new to the hobby and haven't heard the comparison.

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06-18-2003, 01:45 PM

Bax

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Os 70

There never was a non-Surpass FS-70. When O.S. developed the Surpass-series of engines, the timing, port sizes, and bore/stroke ratios were changed a bit over the original FS engines to increase the RPM and power output.