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  1. #1
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    Default converting hydraulic motor specs

    group 2 bsp ported gear pump 6cc

    what is that in american english? having trouble finding where to convert displacement to gpm

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    Quote Originally Posted by cg285 View Post
    group 2 bsp ported gear pump 6cc

    what is that in american english? having trouble finding where to convert displacement to gpm
    Displacement per revolution x RPM?

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    You need the speed.
    6cc=0.37 ci
    231 ci per gallon
    Go from there.

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    Quote Originally Posted by Miguels244 View Post
    You need the speed.
    6cc=0.37 ci
    231 ci per gallon
    Go from there.
    when i am looking at specs to buy one rpm is not mentioned. on this side of the lake they are rated @gpm, the other side at Xcc. would not the gpm change with speed also?

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    Quote Originally Posted by cg285 View Post
    when i am looking at specs to buy one rpm is not mentioned. on this side of the lake they are rated @gpm, the other side at Xcc. would not the gpm change with speed also?
    You need to know the speed you will be running the pump at.
    You also need to know the speed to convert from gpm into displacement.

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    Maybe just post a link to the motor.

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    i converted 6.3cc to .384ci and found a listing for a pump @6gpm. looking at that link i assume it refers to liters per minute which comes to 2.3gpm @1500, so 4.6gpm at 3000 which doesn't match the other at 6gpm

    maybe 4.6 rounds off to 6
    Last edited by cg285; 03-13-2018 at 01:34 PM. Reason: added last line

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    Quote Originally Posted by cg285 View Post
    i converted 6.3cc to .384ci and found a listing for a pump @6gpm. looking at that link i assume it refers to liters per minute which comes to 2.3gpm @1500, so 4.6gpm at 3000 which doesn't match the other at 6gpm

    maybe 4.6 rounds off to 6
    The link you provide clearly stated "at 1500 rpm" I would not extrapolate
    that up to 3000 rpm.

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    Quote Originally Posted by digger doug View Post
    The link you provide clearly stated "at 1500 rpm" I would not extrapolate
    that up to 3000 rpm.
    I agree and click on the specification heading

    That pump has a max speed of 3500 rpm which I worked out to 22 l /min or 5.8 US gal / min

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    Quote Originally Posted by Limy Sami View Post
    I agree and click on the specification heading

    That pump has a max speed of 3500 rpm which I worked out to 22 l /min or 5.8 US gal / min
    I see that now,(separate max speed listed up top) usually I see the spec's given for the max conditions.

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    Quote Originally Posted by digger doug View Post
    The link you provide clearly stated "at 1500 rpm" I would not extrapolate
    that up to 3000 rpm.
    my american link said [email protected] [email protected]

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    Quote Originally Posted by cg285 View Post
    And that depends on who did the maths,

    A tip for conversion, forget about cubic inches etc etc it confuses the picture -stick to liquid volume 1000 cc's = 1 litre. 1 litre = 0.264172 US gallons

    Believe it or not, volume per rev and RPM are the same both sides of the Atlantic

  14. Likes digger doug, TeachMePlease, steve-l liked this post
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    would there be a problem is the l/gpm was higher than specified? like on a dirt bike it's all in the throttle

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    Quote Originally Posted by cg285 View Post
    would there be a problem is the l/gpm was higher than specified? like on a dirt bike it's all in the throttle
    Are you asking to push the GPM higher than max rated ?

    What are you trying to do with this motor ?

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    More gallons per minute at a given pressure takes more tourqe to pump, theres no free ride on this stuff. Most hydrulic pumps will extrapolate up and down pretty linearly, there fixed or nearly fixed displacement devices, its only at very low speed will they fall off, generally as speed increases they pump more as leakage reduces.

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    Quote Originally Posted by digger doug View Post
    Are you asking to push the GPM higher than max rated ?

    What are you trying to do with this motor ?
    not push the gpm higher but purchase a pump with a higher gpm rating (which is more readily available)

    small engine (13hp) powering 3 rams and one hyd motor.

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    Quote Originally Posted by cg285 View Post
    not push the gpm higher but purchase a pump with a higher gpm rating (which is more readily available)

    small engine (13hp) powering 3 rams and one hyd motor.
    You need different belt/gear drive ratio if you want to get the same pressure as you get with the smaller pump.

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    Quote Originally Posted by MattiJ View Post
    You need different belt/gear drive ratio if you want to get the same pressure as you get with the smaller pump.
    so the answer is no, don't use a higher gpm pump - correct?

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    Quote Originally Posted by Limy Sami View Post
    And that depends on who did the maths,

    A tip for conversion, forget about cubic inches etc etc it confuses the picture -stick to liquid volume 1000 cc's = 1 litre. 1 litre = 0.264172 US gallons

    Believe it or not, volume per rev and RPM are the same both sides of the Atlantic
    Ya'll dont use metric RPM?


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