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  breaffyaviation said:
Thank you both for the info.I needed to know if I had enough vacuum to operate an old WW2 horizon gyro that someone had sitting on a shelf .It requires 4.5 in hg.

Thanks again and Happy Christmas to all.

Jude

 

why? a what?...WWII?. is there a *Norton Bomb-site attached to this or?

 

*Hogans Hero joke from sitcom.. (was actually top of a light)... that Colnol Klink was so gullable... er... any way... you got me scratching my head on this one... wass up?:confused: Pics after installed... could be cool....

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  breaffyaviation said:
Do any of the knowledgable folks on this board know how much vacuum is produced (in hg) at the intake manifold of a non turbo ea 81?

Regards

Jude

Please note that the vacuum will go way down with throttle opening (duh!)... and with altitude. You may not be able to get a deep enough vacuum at 3/4 throttle. Perhaps a more important question is how much airflow the gyro needs; too great of a CFM demand and your engine won't idle... at least not at a low RPM.

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