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 My own gear pump hydraulic dyno

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AuteurMessage
Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

My own gear pump hydraulic dyno Empty
MessageSujet: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeMer 10 Juil 2019 - 14:47

Hello everybody, here is my hydraulic dyno that I have built this year for test kart and moto engine. It is still work in progress, but at the moment work quite good.
The only issue that I must solve is interference that caused connessione problem and wrong load cell's readings.
It is built with 70cc gear pump mounted between 2 big ucp bearings, where its turning is forbidden by load cell throug a torque arm.
A oil flow valve controlled by stepper motor that close the oil duct so the pump can brake the engine.
A 35l hydraulic oil tank.
The aquisition data and software are prodocued by Yourdyno.
At the moment dyno jt must be painted and I will add some other supports.
Sorry for my terribile english!!!

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Toop



Nombre de messages : 3510
Age : 19
Localisation : Tours
Date d'inscription : 02/01/2010

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeMer 10 Juil 2019 - 21:34

This is the code you have to insert to direct view :




Code:
[img]https://i.servimg.com/u/f71/20/09/03/87/img_2016.jpg[/img]

[img]https://i.servimg.com/u/f71/20/09/03/87/img_2018.jpg[/img]

[img]https://i.servimg.com/u/f71/20/09/03/87/img_2017.jpg[/img]



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2strokeman

2strokeman

Nombre de messages : 1076
Age : 44
Localisation : au pays du champagne
Date d'inscription : 07/06/2011

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 11 Juil 2019 - 14:13

Beautiful dyno My own gear pump hydraulic dyno 771973 My own gear pump hydraulic dyno 241515
good work
what is the software ?
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 11 Juil 2019 - 14:21

Thanks!
The software and aquisition data are "yourdyno" you can see the website where there are some interesting ideas
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JanBros



Nombre de messages : 244
Localisation : Belgique
Date d'inscription : 05/12/2011

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 11 Juil 2019 - 18:39

won't your results be influenced by the change in viscosity of the hydraulic oil due to the rise in temperature of it ?
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 11 Juil 2019 - 18:54

No because this dyno calculate the torque by load cell's readings and not by the oil pressure. The only thing that change a little bit with oil temp is the starting position of flow valve, but this differenze is so little that no adjustements are required. I have tested the same engine in different days (of course with eviromental correction) with same setup and same egt temp so the max differences in power that i saw was about 0.3hp
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JanBros



Nombre de messages : 244
Localisation : Belgique
Date d'inscription : 05/12/2011

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeVen 12 Juil 2019 - 10:36

Eric_91 a écrit:
the max differences in power that i saw was about 0.3hp

I'm sure Jan Thiel would find that unacceptable. But as there are very few Jan Thiel's in this world, you'll be fine. I know I would be happy with that My own gear pump hydraulic dyno 241515
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JanBros



Nombre de messages : 244
Localisation : Belgique
Date d'inscription : 05/12/2011

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeVen 12 Juil 2019 - 10:37

double


Dernière édition par JanBros le Sam 13 Juil 2019 - 1:05, édité 1 fois
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeVen 12 Juil 2019 - 10:51

Sure, but I think these differences is cause more by engine power fluctuation than a error in dyno's readings
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Dan42



Nombre de messages : 5447
Localisation : Margerie-Chantagret 42
Date d'inscription : 06/04/2014

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeVen 12 Juil 2019 - 11:44

Or by internal pressure loses in the pump?
Dan
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeVen 12 Juil 2019 - 11:59

I think, but probably I'm wrong, that the oil pressure doesnt influence in any way the torque readings of dyno. I try to explain:
The only task of hydraulic pump is brake the engine. If the viscosity of oil change by increased temp, is only necessary more % of flow valve closing to maintein the same brake %.
If internal pump losses increase, It mean that is necessary less % of flow valve closing to maintein the same brake %.
Only matter the force that pump case trasmit to load cell by load arm, that multiplied per load arm's lenght and gear ratio give me the torque that engine product. Water dyno works at the same way.
This is my thought but probably It is not correct, I'm open to your ideas.
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Frits Overmars

Frits Overmars

Nombre de messages : 2229
Age : 71
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeVen 12 Juil 2019 - 12:59

Eric_91 a écrit:
I think, but probably I'm wrong, that the oil pressure doesnt  influence in any way the torque readings of dyno.... Only matter the force that pump case trasmit to load cell by load arm, that multiplied per load arm's lenght and gear ratio give me the torque that engine product. Water dyno works at the same way.
You are correct Eric, provided that there are no external hoses that exert varying forces on the pump under the influence of varying oil pressure.
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeVen 12 Juil 2019 - 13:22

Thanks Frits! The pump flanges are parallel to pump axel and there isn't hoses under pressure. The flow valve is connect directly to pump flange. The rubber hoses doesnt work under pressure and they are locked to dyno chassis to avoid any movement that can create force in the pump case.
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 16:31

Hi guys, I have a question for someone has already worked on dyno. My dyno is arranged in my garage. I have one aspirator (3 phase 0.37kw) for exhaust gasses and another similar aspirator for residual gasses in dyno zone. Unfortunatly this setup are not able to extract all gasses from garage so the results is that after 20minutes of work you must stop work if you dont want to change your lungs as you change pistons 😂. To solve this problem I thought to build a dyno room with plasteboard walls and I will work out of room with PC. Considered that I will test only 125cc engine, which should be the volume of room to allow a proper breathing to engine?
Thanks in advance
Eric
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 16:34

This is the actually setup
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fd-racing

fd-racing

Nombre de messages : 834
Age : 56
Localisation : france/fréjus
Date d'inscription : 03/02/2014

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 18:16

Ciao Erick , the volume of the room is not critical , what's critical is the amount of air ( from the outside )  getting into the room , that's very critical , for the engine breathing and cooling  and your health  first  of all  My own gear pump hydraulic dyno 800210


obviously a room under 8/10 m2 is not really appropriate for such job


nice job anyway , I am also using yourdyno software with an water brake


if I were you I will add an cooling system to your oil circuit , the steady is the temperature the better is  My own gear pump hydraulic dyno 771973



.
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 19:09

How do you extract the exhaust gasses from your dyno room? Do you have interferences problem with your dyno? My blue box lost connection continuosly during the test...
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fd-racing

fd-racing

Nombre de messages : 834
Age : 56
Localisation : france/fréjus
Date d'inscription : 03/02/2014

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 19:30

My water brake dyno is mounted directly on the bike ( I'll be ready soon ) , so I will do my run and test outside .

what connexions do you lose , computer , sensors , load cell ?

have you ask help on the Yourdyno forum ?

.

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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 20:29

Lost connection with PC. The cause is the coil but I think there isn't a solution... Shelded spark and resistor cap doesnt solve the problem.
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fd-racing

fd-racing

Nombre de messages : 834
Age : 56
Localisation : france/fréjus
Date d'inscription : 03/02/2014

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 20:58

What makes you sure that it's the coil ?

the YourDyno unit is powered by the 5v from the computer ,and it must be very stable , are you using a laptop computer ?

.
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 21:09

I'm sure because I have made noise test with off engine and no problems appears. Do you think could be useful a external power supply to male stabile the voltage?
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fd-racing

fd-racing

Nombre de messages : 834
Age : 56
Localisation : france/fréjus
Date d'inscription : 03/02/2014

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 21:35

Have you tried to put the computer away from the engine coil   ( 3/5 m) , and do you use an shielded usb câble ? ( very important )

what is your rpm  sensor ? , and is it shielded ?

in any case all the cable must be shielded , and all the shield must be star connected to ground

it seems that you have an ground loop ( very common ) , have a look to all your circuitry  My own gear pump hydraulic dyno 771973

.
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ridley

ridley

Nombre de messages : 1290
Age : 64
Localisation : Dans les collines du Perche
Date d'inscription : 19/02/2009

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeJeu 18 Juil 2019 - 23:00

Ne rentre pas le silencieux dans le tuyau d'évacuation des gaz. Simplement la sortie à fleur du tuyau. J'ai déjà remarqué cela sur mon banc, en aspirant les gaz d'échappement, la turbine aspire également l'air du local. Ce qui permet de moins faire chauffer le silencieux et le tuyau d'évacuation, et accessoirement d'éviter de fausser les mesures (températures du système d'échappement et dépression créé par la succion de la turbine).
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Eric_91



Nombre de messages : 24
Localisation : Italia
Date d'inscription : 09/07/2019

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MessageSujet: Re: My own gear pump hydraulic dyno   My own gear pump hydraulic dyno Icon_minitimeSam 20 Juil 2019 - 10:06

Fd racing: What do you mean as ground loop?
Ridley: I try to translate with google but Im not sure I understood. So do you mean that if I keep the aspirator hoose out of silencer the exhaust gasses would be better aspirated? What kind of aspirator are you using?
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