Saito perry pump in backplate

Just an update to anyone concerned (mostly Mr. Walker).

If you decide to mount the perry pump in the backplate of your Saito, I think you will find that the thing is super duper powerful with the nipple straight into the crankcase. I found that the pressure (volume) was a little too much even with the screw all the way out.

A simple fix, however is to replace the tubing from the pump to the needle with small fuel tubing. This slows the flow enough to make good use of the adjustment screw once again.

I found that the needle should be in approximately the same position as without the pump. Say the needle is set two turns out without the pump. Try to set the pump where the needle is claose to the same position. This will give you basically the same run, but much steadier, and way better in the overheads. IF the needle is closed more than the non-pump setting, you will find you will have an excess of pressure, and this can cause richening in the manuevers.

Also, it appears my tank shim has changed at least a quarter of an inch down.

Godzilla,

Having predicted the possibility of using pumps--and dreading it--in those infamous Bad Boy Stunt columns of a couple years ago, your views on this prompted me to install a Perry pump in my Saito 72.

No test flights as of yet, although I did final tweaking on a test stand. I found the instructions supplied worked fine, beginning with needle opened to a rich setting w/o pump, with pump operating to lean mixture at the pump and then go back to setting mix with intake-mounted needle valve.

There did not seem to be a need for restrictions to fuel flow, but as mentioned I have not flown it yet.

Pump is mounted in back door of motor, PA needle valve assembly, Godzilla-approved fuel, .281-bore venturi.

>Godzilla,
>
>Having predicted the possibility of using pumps--and
>dreading it--in those infamous Bad Boy Stunt columns of a
>couple years ago, your views on this prompted me to install
>a Perry pump in my Saito 72.

Good I need another mule.

In the blues sense?

City Smasher,

Your mule will tell you to be careful if tempted to use fuel with any castor at all in conjunction with this pump. They are really nasty when clogged.

Also a good idea to pinch off inlet and outlet lines between flying sessions so residual fuel doesn't evaporate, leaving only oil residue to spoil next flying session, even if not to the extent possible with castor.

Leonard,

When you're up to messing with software, you might take a look at your forum's clock. I actually posted the message above at 22:28 ADT, 29 June 2000 (02:28 EDT, 01:28 EDT 30 June 2000), not the time shown, if it makes a bit of difference.

Let me join in with expressions of relieve and happiness that your are home and on the road to recovery. Everyday from here on out will be better than the previous I'm sure.

Take the time necessary to make a complete recovery.

Great that your back Len. Take it slow for now.
Jerry Tarnofsky