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  #26   IP:
Old 08-11-2017, 01:38 AM
Van_Isle Van_Isle is offline
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Top picture?

They're side-by-side for me.
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  #27   IP:
Old 08-11-2017, 01:39 AM
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Originally Posted by goodoldboat View Post
looks like the top picture ..
Which impeller do I need ?
Just tell Ken at MMI that you need a impeller for a Oberdorfer pump. He will fix you up.
Also tell Ken you need a M7 cam shoe to increase the pump's output. P\N CSOB_8_69.
I'll explain as well as I can remember. If Ken or another member says something different go with what they say.
Anyway: The Oberdorfer pump comes with a 5 millimeter cam. Increasing the cam to 7 mm compresses the impeller blades more resulting in more pump output.

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  #28   IP:
Old 08-11-2017, 10:17 AM
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sastanley sastanley is offline
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gob..some pictures would help clear up the confusion a bit...and/or a short video of the exhaust uploaded to youtube.
"Twice Around" - '77 Catalina 30, #511 with original A-4 & MMI manifold.
Great fall sailing!!
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  #29   IP:
Old 08-11-2017, 11:27 AM
goodoldboat goodoldboat is offline
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thanks guys and good advice .. I will get to boat this weekend and take video ..
S/V Gosling
Westport CT .

“Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.”
― Kenneth Grahame
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