shurflo pumps - pulsing fix

slostar · #1 03-03-2006, 10:42 AM

this may have been done before. but; after not liking the way the pump plused on and off on the presure switch. i came accoss cheap, simple dc motor controler kit. now i can vary the speed of the motor and set the speed so it holds just under the pressure switch threashold. witch = no more pulsing and nice even pressure

. im sure the kit could be modified to make a variable presure system as well.

may be helpfull to someone..

heres the kit i used, altho i brought it localy for almost half the price:
http://electronickits.com/kit/complete/motor/ck1400.htm

Richard L · #2 17-03-2006, 02:06 AM

This is a very good post for many of those who uses Shurflo pump with a demand switch. We put by-pass valve to overcome this pressure spike problem.

Your method will be excellent for a fixed rate injection system, but difficult to hold a steady pressure without some kind of feedback loop.

Nevertheless, it will help 90% of the fix delivery system.

Richard

simple · #3 17-03-2006, 05:30 AM

Have to remember that with this type of controller your time for W/I system to response (turn ON) will be increased due to pump taking longer to reach operating pressure.
It will need to be activated a bit earlier to compensate?.

:roll:

slostar · #4 17-03-2006, 10:03 AM

yeh, i was thinking of using a pressure regulator of some type, and/or a check valve with a high cracking pressure, returning back to the tank. but thought i'd give this a go insted. it isnt perfect but works and doesnt cost alot. the respose time seems to differ very little, than without the controller on it. almost instant. (with water in the line of course) found i didnt have to turn the pump speed down all that much to stop it hitting the presure switch, just a matter of setting it while the car was running, as the extra voltage from the alternator was enough to rase the pump speed.

busky2k · #5 17-03-2006, 11:38 AM

I thought something as simple as a Shurflo Accumulator would do the trick!

NAnderson · #6 17-03-2006, 04:16 PM

Quote:

Originally Posted by busky2k

I thought something as simple as a Shurflo Accumulator would do the trick!

BINGO!

Exactly what I was thinking even before I opened this thread. It might not have been designed for water injection, but damn if it doesn't work perfectly for this situation.

Over the years I've found that employing the "KISS method" eliminates a lot of headaches.

redvictor · #7 17-03-2006, 08:28 PM

Quote:

Originally Posted by NAnderson

Quote:

Originally Posted by busky2k

I thought something as simple as a Shurflo Accumulator would do the trick!

BINGO!

Exactly what I was thinking even before I opened this thread. It might not have been designed for water injection, but damn if it doesn't work perfectly for this situation.

Over the years I've found that employing the "KISS method" eliminates a lot of headaches.

yep,accumulator works great....

simple · #8 18-03-2006, 04:01 AM

Is it an air or water accumulator been used?
Just thinking if it is an air type it will cause a plenty of overspray after the pump turns off, unless you have flow valve/solenoid.

slostar · #9 18-03-2006, 10:21 AM

Quote:

Originally Posted by busky2k

I thought something as simple as a Shurflo Accumulator would do the trick!

yup, this is just another answer to it thats all. i thought i'd share

redvictor · #10 18-03-2006, 12:33 PM

Quote:

Originally Posted by simple

Is it an air or water accumulator been used?
Just thinking if it is an air type it will cause a plenty of overspray after the pump turns off, unless you have flow valve/solenoid.

100cc water accumulator.........