Difference between pump quality/performance: alchycontrol vs SMC

[Earl H]

I know the alchycontrol pump is much bigger. I just wanted to know if there is a difference in quality and performance (i.e. pressure, flow, etc.) in the pumps used in two kits.

Note: this assumes you are using external mount setups.

 

[Razor]

Well I will only speak of the pump I use.

Pro's..
It can generate over 150 PSI on a small nozzle, actually there is a post on this board whereby someone pin'd a 250 PSI pressure guage with one bypass'd. And another blew apart a solenoid.

Has been rated by the MFG at 1500 hrs continuous,

I have had zero pumps fail in the year i've been selling these systems,

In relative terms, its inexpensive.

My supplier sells 3500-4000 of these pumps a year, over the last 6 years he's had less than a handful back.

Mine has been sitting in straight 100% methanol since April '03

Cons.. its big, ugly, response due to mass is slower than an EFI pump, is not smooth in its fluid delivery due to its diaphram design, and not compatible with oils(like gasoline).

Only reported flaw in the pump, on the net I have ever seen has been a leaky pressure switch assembly. And someone who reported theyre mounting bracket broke.

On the not smooth delivery issue, it has not shown to be an issue on any system i've put together. Or on anyones application.

I cant say how pumps have been shipped, treated, mounted, installed, etc.. Only from what i've been able to research. None of the reported problems have been from my customers. Just from those using the same style pump.

Lastly there have been no reports of the motor ever failing.

Anything I miss?

 

[Earl H]

What is the flow rating of the SMC external pump....

 

[Razor]

One thing you may be missing, you use the nozzle for flow based on pressure developed.

You can get a 30 gallon per minute pump.. but if you can only put so much through a small orfice at "X" PSI. What will change that is the size of the orfice. So once you determine operating pressure, then its up to the nozzle to perform under that pressure. So trying to figure flow to calculate whats going to be delivered, is putting the carriage before the horse.

SMC does sell various pumps, you'll need to contact him for his specs. I would guess like an EFI pump.. so 100 PSI at 12 volts?

The use of electronics to control pressure makes things simpler. Example the Shurflo will make 100 PSI pressure at 8 volts in bypass mode on an M15 nozzle. At 10 volts 135 PSI. So dropping voltage you drop pressure..thus dropping flow. Same applies to the EFI pumps.. hence why the dual nozzles are needed with EFI type pumps on higher power apps. If you dont have pressure to make the flow.. you add nozzles.

HTH