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Old 09-10-2010, 11:34 PM
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Default engines

Witch is the stronger engine os91 4c w/ pump or 20cc gas? 91 output 1.6 dl20 2.5 for a p51 mustang 65.5 span.
Old 09-11-2010, 06:21 AM
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Default RE: engines

According to your numbers the 20cc.
Old 09-11-2010, 07:27 AM
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Default RE: engines

I have several OS 91fs engines, great engines, but I wouldn't use them on a 65" span mustang, a 120 yes.

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