General Pump TSF2421

NJWashingGuy said:
The spec sheet says it will do the following:
1. 12 gpm @ 2500 psi spinning at 1750 rpm
2. 10 gpm @ 3000 psi spinning at 1450rpm

If the following is correct, can I sping the pump at a lower rpm to produce approximately 8 gpm. If I figure correctly for every 145 or 150 rpm gets 1 gallon of water.... so If I spin it at @1200 rpm, will it do 8 gpm at 3000 psi?


Also, what is the mathematical formula for figuring out the pulley ratios. If I had a 3.75 inch pulley on the engine and wanted 1200 pump rpm, what size pulley would I need?

Thanks for the help is anyone knows......I was never a great math student.
Mike.
Click to expand...

I'm looking to do the same thing but I'm a little lost.
I just picked up a great deal on a hot skid that someone swapped the pump out for what I think is the GP TSF2421 (it has the crown logo but the tag is missing). The engine is a Honda GX670 (24hp) so personally this wouldn't be my first choice of pump but I need some help to make it work for me. I'd like to get at least 3000 psi at 7 or 8 gpm. Is this workable with this engine? Here's what I know now...

K1 unloader
At engine rpm 3400, the pump spins at 1420 rpm. and right off the head (no unloader) wide open it puts out 10gpm at this speed. I think the pulley is about 8 inch, and the engine one is about 4 inch.
Under load (#10 tip) thru the unloader and coil and 100ft of hose it bucket tests at 8gpm. I think the most psi i got out of it was 3000psi, but i wasn't able to replicate that today after messing with the unloader. So is the solution to get a larger pulley (about 10.5inch) on that pump and then tip size it to aim for 3000psi??? Another question, if this pump is rated for 2500psi, will 3000psi damage it?

I will pull the belt guard off this weekend to get a better measurement on the pulleys.

Thanks!
 
http://www.generalpump.com/pdfs/TSF2421.pdf

Here's the spec sheet on the TSF2421. As you can see, it's rated at 3,000 psi @ 10 GPM. So, 3,000 psi won't damage anything.

If you want 8 gpm, use the the pulley formula at the beginning of this thread and find what you need to make the pump turn at 1160 rpm.
 
Okay, so I did some measuring...my current engine pulley is 3.75 and my current pump pulley is 8.75. According to the formulas to drop down to 7gpm i need that pump spinning at 1020 rpm and that would require a 12.5 inch pump pulley. So now my question is where will I get that and will it even fit in my belt guard? My skid has an opening out the bottom so the pulley wouldn't bottom out. (The math for the 8gpm came to 1167rpm and 10.93 inch pulley)
 
The best deal I could find online is this.

Its an 11.75 OD 2 groove v belt pulley. So according to my math that will spin at 1085 rpm and give me about 7.5 gpm. I think I will have to modify or lift my pulley guard to get it to fit. Does anyone know if I will need a different bushing or belts?
 
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