Oil & Fuel Turning upthe Fuel!

[Westro]

Sorry couldn't find anything through a simple search. Does anyone have any instructions on how to turn up the fuel on a D722? The pump looks very similar to my Z600 in my BX1500.

Thanks

 

[Westro]

I should explain a little more, I bought a used Kubota D722 motor it was an old Onan Generator motor that was used very little. I am in the process of machineing a diesel smart turbo charger for the D722. The application is unknown at this time but there is no reason to turbo charge it if I can't increase the fuel to it.

I know all the disclaimers, as this is simply a 'play' motor.

 

[Lefty_Kubota]

all i gotta say, is i wanna see pics of this unit when the turbo is added

 

[RickB]

there is no reason to turbo charge it if I can't increase the fuel to it.

Sure there is; increased horsepower AND fuel efficiency.

 

[Westro]

Just adding a turbo without pump work shouldn't increase HP? I mean a diesel already runs 'lean'.

Well I have a new plate machined and a pyrometer installed, Oil lines are run and I am planning on firing up my D722 on a makeshift stand this weekend. I'm still wrestling with what type of boost I should supply. Any suggestions? As it appears that the stock wastegate maybe good down to about 6psi. BTW I am using a turbo off a 600cc Smart diesel.

 

[mcnitt]

Hello Westro - and happy New Year...
What is a "tiny Tac"?

 

[amigauser]

Hello Westro - and happy New Year...
What is a "tiny Tac"?

Welcome To Tiny-Tach. Small and economical tachometers for gas and diesel engines.

 

[RobJ]

Sure there is; increased horsepower AND fuel efficiency.

Nah it won't.

 

[RobJ]

Sorry couldn't find anything through a simple search. Does anyone have any instructions on how to turn up the fuel on a D722? The pump looks very similar to my Z600 in my BX1500.

Thanks

On that motor the fuel stop should come out of the front cover. If it's OEM it will have the lead seal on it. Generally backing the screw out will give the rack more room to travel. On the ones I worked on the timing was generally advanced a bit to. Keep an eye on the exhaust temps if you run full load without a break.

Good Luck,
Rob

 

[RickB]

Nah it won't.

I missed your point; please explain.

 

[RobJ]

I missed your point; please explain.

Check Westro's comment. Only way to get more hp is to increase fuel.

 

[RickB]

Check Westro's comment. Only way to get more hp is to increase fuel.

You and Westro are both wrong. Adding boost pressure to a normally aspirated diesel will increase HP more often than not. And more complete burn will also increase efficiency more often than not. I've been around too long not to know this for certain.

 

[Westro]

I will concede, I believe that adding a turbo and not increasing the fueling will increase horse power under load. The extra air will help during the times you 'normally' would see some black smoke, the turbo with the extra air would take care of that.

So yes, leaving everything stock, I should see an increase in economy and HP by adding a turbo. Please let me know if my thinking is correct. If this is the case I would like to keep the fueling stock and simply see what boost alone does to economy and HP before I experiment with extra fuel.

Thanks, enlightening conversation.

 

[RobJ]

You and Westro are both wrong. Adding boost pressure to a normally aspirated diesel will increase HP more often than not. And more complete burn will also increase efficiency more often than not. I've been around too long not to know this for certain.

How can you know this for certain but in the previous sentence say "more often than not"?

If that's all it takes to get better fuel economy Then every engine should have one, car, boat, lawnmower, leaf blower!

I've been around trees all my life....but I still can't tell which is which!