Some Pumps and Valves for Liquid Fuels

[larry cottrill]

Haven't tried these, but they're beautiful looking gear and seem to be reasonably priced. The servo-driven valves are apparently set up with O-ring seals and such. This is model aviation size stuff:

Home page: http://www.perrypumps.com
Pumps (low pressure & regulated): http://www.perrypumps.com/prod02.htm
Valves: http://www.perrypumps.com/prod03.htm

James Irvine (or anyone) - have you ever used any of these?

L Cottrill

[Irvine.J]

Hiya Larry, I have not tried the perry pumps myself. Going over their website I see they have a good looking little check valve. I actually need one of those so i'll be purchasing one myself. As for the pumps, If i'm not mistaken is says 0.25 psi, is that a typo?. At 25 psi though, you'd be talking more in terms of a pump assisted carburetor more then injected. At .25 psi, the pressure pulses would pretty much stop the fuel and kill the engine I think.

Up until just recently I have been just finishing solving the pressure pulses sending fuel back down the fuel line, even at 140 psi! Check valves and proper placement is a must.
If you want like spray or fogged injection, for alot less you can get yourself a sig gasser which will last a while and has significantly higher pressure for about 29 usd. Only thing is don't ever suck on it to get the fuel out, you dislodge the seal. Just be gentle with it and should last quite a while.

I don't think the pressure is what your after Larry, there are lots of different pump manufacturers on that document. But, as far as i can tell the sig gasser is the bottom end of the market that actually works in a valveless without getting stupidly hot.... *as far as I've found, but I'm hoping many others will find alteranatives over time*

On that youtube video, that is using a SIG Gasser out of 2x 0.34 mm carb holes, it could have taken more fuel, but damn, it worked well

[ed knesl]

James,
Where did you get that SIG gasser from ?

Ed

[Irvine.J]

Hi Ed, the sig gasser from the cheapest place I believe is tower hobbies.
http://www2.towerhobbies.com/cgi-bin/wt ... XDJR7&P=ML
Thats actually cheaper then from the SIG MFG homepage LOL!

Anyway, its not a bad little pump, but lacks the psi and is much larger then the flightworks pump. Its pressure is still good though, I believe somewhere between 40 and 60 psi. Though I haven't tested it. But you know its like 100usd less, and still does the job well. The other advantage of the sig is its fine to use with gasoline, where the flightworks pumps are not lest you spend A LOT more and they make it with different gear. So for experimenting, and even flight use, at 50 grams the sig gasser is the way to go on a budget, especially for trialing/testing. I am absolutely terrified of my flightworks pump, such a fragile little thing, huge amounts of pressure though, ha!

[heada]

I have that exact pump. It will output 65 PSI in a closed water circuit (water in a line connected to a 100 PSI water pressure gague) on a full 12VDC source (12VDC 50A battery). It's not small, nor very light, but the thing is actually very powerful for the price.

I use it to pump kerosene and it hasn't had any problems with about 3 hours worth of use so far.

-Aaron