What H P will work on 22&28 GPM pump

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Whitepine2

Feeling the Heat
Feb 15, 2011
314
Southern Ma
I have a 4 1/2 piston with 8 HP B&S hooked to 16 GPM pump.I am going to put a 22 or 28 gpm to speed things up. I have a 11HP B&S self start which I think will run a 22 gpm I know it;s underpowered but so to is the 16 with 8HP. I have had this splitter for years and only stalled it one time,not paying attention.I can get a 13 HP from HF still underpowered for 28. My question is will ether of these work as well as the 8 and 16 did dozes
anyone know? BTW the piston has 28" of stroke but I only need 24 to 27. Will the 11 HP run the 28 GPM pump any info on this will be welcome.

Thanks Whitepine2
 
Are your hoses and valve big enough for the 28 gpm pump? If not, you're just wasting $$$$. I don't think 1/2" will get the job done.
 
Yep have 3/4 hose on all ready have hose machine and replaced all 1/2 year ago. This is some of the problem as the outlet size for the 16 GPM is only 1/2 putting 3/4 helped some but very little.Mike I see
you are from Kent been there many times for the engine show I have about 40 of them one of the best
shows in the East. BTW valve is good for 30 GPM
 
22 takes 11hp and 28 takes 14hp.

Edit: you can go over, just don't go under. (this would be for an average pump pressure of 2500-2750 psi).
 
Jags what would the outcome be using a 13 on a 28. I am using an 8 on a 16 now which is underpowered and have had good going with this set up for years. I just don't want to do something that will fail and get out of spending a lot of $$$
 
13 on a 28 will bog the engine when at the upper pressure limits. A good running 8 should be able to pull a 16 gpm minute pump up to about 2700 PSI (assuming typical two stage pump).

Good rule of thumb for two stage splitter pumps:
1/2 hp per gallon of flow.
 
whitepine 2 - the CAMA show grounds are a mile from my house - And you're right, they do a good job. Back to your splitter, I ran my 11 gpm pump for 30 years on a 5 hp Briggs, and it's last 5 years the engine was getting pretty weak. It still ran it though. As long as your 13 was in good shape, you could probably get by with it. Hey, if it doesn't you can always go looking for a bigger one.
 
You can adjust the relief valve until the max pressure when on the low flow section equals the hp you have available. Lowering the pressure gives up force in the cylinder though.

then, adjust down the unloading pressure so the high flow at unloading pressure, when it 'shifts', equals the hp you have available. That doesn't affect the final high pressure maximum force of the cylinder, only the pressure at which the fast speed unloads to slow speed.

Most engine are less hp than advertised. And they are often 'rated' at 3600 rpm or even higher, but the governors set for 3000-3200- etc.
 
mike van said:
whitepine 2 - the CAMA show grounds are a mile from my house - And you're right, they do a good job. Back to your splitter, I ran my 11 gpm pump for 30 years on a 5 hp Briggs, and it's last 5 years the engine was getting pretty weak. It still ran it though. As long as your 13 was in good shape, you could probably get by with it. Hey, if it doesn't you can always go looking for a bigger one.
Click to expand...
Yes I have run an 8 HP on 16 GPM 8 was weak a take-off from a gen. and I only stalled it one time operator error not paying attention to things. I do have a 11 HP which would run a 22 as Jags stated and if I were to go with a new 13 from HF could may-be run a 28 but I would not like to lose power. I don't like to run things hard and use more fuel just to try to get all the force but would like to get more speed. I do have a 2 cly.Lister diesel rated at 12 British HP which I think is more than HP ratings than US,this could be cobbled up so many ways to do this but I only want to do it once and right. Thanks for all the input.
kevin j said:
You can adjust the relief valve until the max pressure when on the low flow section equals the hp you have available. Lowering the pressure gives up force in the cylinder though.

then, adjust down the unloading pressure so the high flow at unloading pressure, when it 'shifts', equals the hp you have available. That doesn't affect the final high pressure maximum force of the cylinder, only the pressure at which the fast speed unloads to slow speed.

Most engine are less hp than advertised. And they are often 'rated' at 3600 rpm or even higher, but the governors set for 3000-3200- etc.
Click to expand...

I know what you mean but sometimes I need all the power by turning down the pressure might not be the best option, Again I don;t want to run engine at full power more fuel and ware and tear. I would like to find someone that has done the 13HP to 28GPM and how well it will operate. Might just
go for 11/22 and or bigger power.don't know decisions,decisions???

Thanks for the info so far from all Whitepine2
 
If you don't want to give up speed, you'll have to run any 2 stage pump at up close to the rated rpm which is 3400 or so. As soon as you slow the rpm's, flow drops dramatically. I know what you mean about running full throttle, but thats what these [2 stagers] were meant to do. Whats your hurry anyhow? you get the woodpile done, your wife'll probably have a whole list of stuff for you - ;lol
 
Well I have a lot of wood to do and I'm old so I gotta do it as fast as I can.Seems like the pile never gets done landscapers always dumping wood off so always got wood to break up.You are right about a list but have my own list as well never ends. Could use big splitter but most that are dropped off are short and need small one for that/
 

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If you want to make that splitter a speed demon with all the power you can muster get a 14+ hp engine and the 28 gpm pump, make sure all the hoses, etc are rated for it and set the relief at 2750 PSI. Then get to work. Even at 3/4 throttle, that thing is gonna get with the program.
 
Ya in my hart of harts figured I'd need the bigger HP,for the 28GPM just trying to see if anyone had tried with smaller one. I think will go on with 8 for now until get a little bigger one. Don't want to go under power if gonna do do it ounce and do it right. Anything to do with wood needs to be overbuilt
wood it tuff on equipment. All new lines 3/4 2 wire fairly new valve and super thick beam pump and HP is weak point at this time This splitter has served me this way for years so will go on for a wile longer.
Just want to make it on the cheap if possible.
Thanks everybody for your input

BTW a large chunk rolled off my table and broke the intake on 8HP so thought this would be good time to update, guard now on table wont happen again I hope I hope
 
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