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Thread: 7 5/8" vs 7 7/8" impeller and engine size

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    Default 7 5/8" vs 7 7/8" impeller and engine size

    I know what the specs and mfg'r recommendations are for this, but wondering what experiences folks have had by maybe using the larger impeller configuration in their rig - thoughts?

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    Not much information, what size/brand motor? What size blade is on the blender now? Does OB jets offer either as a option?
    “Nothing worth doing is easy”
    TR

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    Here is an older thread on the same topic.

    http://forums.outdoorsdirectory.com/...5%2F8+impeller

    Lots of information here as well as a few performance tests to show the differences.

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    Thanks Glen - good info as always.

    Currently running a 21' XL / E-Tec 175 with 7 5/8".... considering going to E-Tec 200 HO; published spec from OBJ folks is that it should still use 7 5/8", but have heard of folks bumping up to 7 7/8". Wondering if the 200 HO can safely push this without stressing components, what sort of diff in performance would I expect, how does it impact WOT, etc, etc.

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    Quote Originally Posted by Alaskan XL View Post
    Thanks Glen - good info as always.

    Currently running a 21' XL / E-Tec 175 with 7 5/8".... considering going to E-Tec 200 HO; published spec from OBJ folks is that it should still use 7 5/8", but have heard of folks bumping up to 7 7/8". Wondering if the 200 HO can safely push this without stressing components, what sort of diff in performance would I expect, how does it impact WOT, etc, etc.
    the 7 7/8 lowers your RPM about 300r's compared to the 7 5/8, it planes quicker, haul's more, and is less apt to cavitate, The current 200HO is rated at 5300 to 6000 earler ones were rated 4800 to 5800. The down side to a 7 7/8 would be dropping out of the manufacture's RPM range. Glen P.S. The 7 7/8 is a must have for any of the newer 250 H.P. motors

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