I have to disagree. I have flown the IB regulator with an OS 1.60 with the tank 18" back in a pattern ship with no problems, on only muffler pressure. I will agree that crankcase pressure is more consistent and creates much more pressure. My statement is that on the IB regulator, I have flown both of the new FAI patterns P07 and F07 and never had a hickup on only muffler (actually pipe) pressure without any problems. In most cases muffler pressure is enough, however there may be instances where crankcase is needed, but until you find that problem, I wouldn't tap the case, just to tap it. If you don't have to tap the crank, then you don't have to remove the engine from the airplane.

Both regulators are similar to the Walbro system (my 3W-200 uses this, and I've put it through everything maneuver known to man..), except the Walbro does not pressurize the tank. It is relying on vacuum to pull fuel up there. By pressurizing the tank you are elminiating this. Fuel is already up to the diaphragm and you are just pulling from there. Essentially you are creating a situation very similar to if the fuel tank was right behind the motor. It takes very little tank pressure to force fuel to the back of the regulator so even if you do have a drop in pressure momentarily, it doesn't matter.

I personally do not like the perry pumps, I have seen too many little problems with them. I know guys are running them successfully, but a lot of guys are running the regulators as well.

In both of my primary ships, I have YS 1.60DZ's, so there are multiple options out there. The regulators do work.

Arch Stafford