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twin engine upgrade

Old 05-02-2009, 09:31 PM
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Join Date: Dec 2007
Posts: 187
Default twin engine upgrade

hi guys single diesel fixed surface drive top speed 64mph with 440 yanmar diesel
im gona add another 440 diesel how should it perform
my current prop dia s 17" with twin engines should i bing dia down or stay with a pair of 17s
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