ts2421 to run at 8gpm

C

Chris Tharpe

New member
I have a tsf-2421 thats made for 12gpm @2500 but I would like to get 8gpm out of it. What can be done when using a gearbox to do such a thing. Idle down the engine? I only need to get 8gpm at about 1600psi max out of it and will be done with a 18 or 20hp engine
 
Yep...
 
There ya go just reduce rpm and you can drop both easy. Or you would have to reset your unloader and change tip size, but why bypass and work the equipment that hard when you don't have to.
 
What about it being an air cooled engine?

I heard that air cooled engines need to run at full rpm to keep the air flowing to help cool themselves so they do not over heat?

Not trying to piss on the idea, just had a concern from what I have heard.

I really like the idea.
 
Christopher said:
What about it being an air cooled engine?

I heard that air cooled engines need to run at full rpm to keep the air flowing to help cool themselves so they do not over heat?

Not trying to piss on the idea, just had a concern from what I have heard.

I really like the idea.
Click to expand...

It would be better accomplished with a 3:1 belt drive system, meaning that since the motor will turn at 3600 rpm, the pump would turn at 1/3rd of that and get ou the 1200 rpm desired. It is not exact, but close.....
 
Christopher said:
What about it being an air cooled engine?

I heard that air cooled engines need to run at full rpm to keep the air flowing to help cool themselves so they do not over heat?

Not trying to piss on the idea, just had a concern from what I have heard.

I really like the idea.
Click to expand...

An engine won't overheat at partial throttle. It's not working as hard, so it's not generating the heat that a higher rpm would be needed dissipate. I have an Onan RV generator. It spins at 1,800 rpms so it runs quieter. And it's in a ventilated box.

Ron, you'll be around 2,270 rpms for the 8 gpm. Understand, though, the horsepower curve drops with the rpms. You'll have 9.5 - 10 horsepower. Here's the performance curve for a GX390.
gx390power.jpg
 
We use the 24hp honda engines for hood cleaning. We can put out 8gpm, but hood cleaning only requires 3-5gpm most of the time (all water is reclaimed and 8gpm is a little difficult to manage indoors...). We run the engines on a considerably low throttle. Sometimes, as low as possible without stalling! I find the engines and pumps last considerably longer than our fleet wash machines of the same size run at capacity.
 
We run most of our machines at half throttle except when running our burners. We get many more hours of opperation between repacking our pumps. We save on fuel costs and you get more hours out of the motors. We have a motor (little one 13 hp) that has over 6000 hours on it. Run them at maybe half throttle unless you need pressure, change the oil often and they last longer.
 
Chris, if you're talking about the 8 gpm gearbox pumps, the engine spins at approximately 3,400 rpm under load to make the 8 gpm, so 3,400 / 8 = 425 rpms per gallon. Multiply 425 by the gpm desired (425 * 5 = 2,125 ) to find the rpm setting for the gpm you want.
 
Russ Johnson said:
Chris, if you're talking about the 8 gpm gearbox pumps, the engine spins at approximately 3,400 rpm under load to make the 8 gpm, so 3,400 / 8 = 425 rpms per gallon. Multiply 425 by the gpm desired (425 * 5 = 2,125 ) to find the rpm setting for the gpm you want.
Click to expand...

That's what I was thinking but it seemed too simple.
 
If you have an 8 GPM machine, and you throttle the engine speed down to 2125 RPM's so you're getting 5 GPM,..how does that effect downstreaming? Will the loss of pressure make the machine want to pull soap with nozzles normally used for rinsing?

I ask this because I will be upgrading to 8 GPM machine for next season,..and water usage is one of my concerns on jobs where I have to haul water,....just wondering if there's a way to throttle down the GPM's but still be able to downstream and wash normally. Would the nozzles I'm currently using work for the 5 GPM,..or will my rinse nozzles be pulling soap due to low pressure. I realize the water consumption should be the same to finish any given job,..but until I get used to the flow I am hoping for a throttle down option that works. I was going to keep my current machine on board,.. but I'm just outta' room,..without making major changes.

Thank You,
Jeff
 
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