1980 Honda CB750F Cafe Build - Page 12

1980 Honda CB750F Cafe Build

This is a discussion on 1980 Honda CB750F Cafe Build within the Project Builds forums, part of the Caferacer.net Forums category; Originally Posted by tjurek51 Any recommendations for a performance high flow oil pump? Right now my plan is to use a 900F oil pump If ...

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Thread: 1980 Honda CB750F Cafe Build

  1. #111
    Senior Member Geeto67's Avatar
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    Oct 2005
    Columbus, Ohio
    Quote Originally Posted by tjurek51 View Post
    Any recommendations for a performance high flow oil pump? Right now my plan is to use a 900F oil pump
    If you feel like spending money this company in japan offers an upgraded pump: https://japan.webike.net/products/21151771.html

    otherwise, it looks like 900F pump is your only option.
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
    - Samuel Beckett
    A tool is just an opportunity with a handle
    - Kevin Kelly

  2. #112
    Senior Member Cyorg's Avatar
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    May 2014
    Quote Originally Posted by Geeto67 View Post
    Length of passageway has an effect on flow rate - when you make passage ways longer you increase pressure needed.

    the DOHC bikes are wet sump, not dry sump, so they don't respond to an increase in volume like the dry sump on a SOHC would (which offsets the extra length). The sump doesn't know there is an extra quart in the system, it just knows it has to pump against increased resistance of the added length of pipe.

    IIRC too the oil cooler isn't just an extension on an existing passage like most of the oil filter based adapter kits for SOHC 750s, it is a separate loop that runs off the pump and into the sump:

    (page 12) http://www.kabalis.com/SuperMagna/CB900-Manual/Honda_1980_thru_82_CB900F_Service_Manual_Chapter_2 5_81_900F_Addendum.pdf

    Os it's not like adding an extension to an existing system so much as it is adding a new second oil circuit. The 750F pump can't keep up with the demands of pumping 2 circuits.
    Not that it matters as far as the OP is concerned...... I have to confess that was an incredibly stupid way of expressing what was rattling around in my head, because yes the cooler and lines add resistance....was also thinking the 750 pump was set up in a similar fashion to the 900. However.... although the 900 has a better setup, I still wonder about the real risk of adding a cooler using the 750 pump. They make the coolers for DOHC 750 that connect to the oil filter boss Y/N? 750 F had their issues, but don’t recall any issues with oil supply. 750 Nighthawk yes, but that was an aeration thing.
    "Non urinat in ventum"

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