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« Last post by ORCoaster on June 28, 2024, 11:47:41 pm »
At the time I was reading Hagar on the forum of the time I took the liberty of capturing some of the fun facts that Hagar would throw out every now and then. I think I have them archived in a Word document on another long dead computer. But the hard drive is a solid state one and may yield the file if I would find the time to do so.
But, in my memory of the volume at RPM to get proper pressure I believe that Hagar would state that you should get 900 ml at 1000 RPM in one minute. If less then you were to tap down the regulator button at the front of the IP. By chance you were pumping more you were to remove the button, tap the regulator all the way out and reinstall it, tap it down some, and retest, tap, and test until you came to the magic numbers he prescribed.
I even tested his numbers by building a pressure gauge take-off as you state. Under the OUT bolt and I would tap and test by two lb increments and I think his 900 ml was spot on at 43 lbs. of internal pressure. More gets you advance sooner and less, which is what we generally see gets you later timing advance. That weak fuel as Hagar called it was the bane of the IP pressure and timing issues. No amount of dialing in the right mm of advance would cure thin fuel. He always added some sort of airline oil with no ash content I believe.