Increasing GPM with same engine & pump??

Yes, a smaller pulley can be installed on the pump to make it spin faster, giving you more gpms.
 
Russ, what is the max rpm you would recommend spinning the pump to in order to increase the volume (gpm), but remain unproblematic?? I would like to get more out of it without breaking it. Also, will this raise the pressure of the output or will it remain in the 3000 psi neighborhood? Thanks for the information, Mike.
 
The most I would spin the pump at is 1725 rpm. Before the onset of high gpm pumps I always ran my 2021s at higher rpms than rated to get more gpm out of them. All you should realisticly expect is about 6.5 to 7 gpms, you will sacrifce psi but as long as your above 2500 psi you should be all right. I would still get over 700 hrs before rebuilds so there wasn't to much durability problems
 
I had 2021 pumps forever. Can't beat the price. I'm pretty sure there rated at 1450 for 5.6 gpm, just look up the website. That 5 gpm 16hp machine is usually 4.8 through a #5.5 nozzle. If thats what you use I would go for one size up - 5.2 through a # 6. If you are using a #5.5 now, try putting a # 6 on there and adjusting your unloader and see if you can hit 3000 psi, up the engine to 3600 if you need to. There may be a little extra flow in there allready.
 
I've heard of over-running the ts2021 a lot, once from a guy at general I think, so it shouldn't be a problem. With that 16hp you would have to come down in psi but it might be worth it - more flow rocks. I think that pump might have been specd at 1740 previously.
 
I'm running a few high volume machines now and they do work quite a bit faster but they also take a toll on you as well. I'm running 8, 10 and 12gpm pumps and I just hooked up my 12 and 8 together to play around. 20 GPM is extremely cool but were only going to use it for rinsing. Washing at that GPM for any length of times will rip your arms off!

But it's cool!!!!!!
 
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