breaffyaviation Posted December 12, 2005 Share Posted December 12, 2005 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 Quote Link to comment Share on other sites More sharing options...
moosens Posted December 12, 2005 Share Posted December 12, 2005 Hope this helps. Happy Holidays,Jude. Quote Link to comment Share on other sites More sharing options...
subiemech85 Posted December 12, 2005 Share Posted December 12, 2005 15-17 in hg @ 1,000 rpm cold Quote Link to comment Share on other sites More sharing options...
breaffyaviation Posted December 13, 2005 Author Share Posted December 13, 2005 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 Quote Link to comment Share on other sites More sharing options...
Indrid cold Posted December 13, 2005 Share Posted December 13, 2005 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? Pics after installed... could be cool.... Quote Link to comment Share on other sites More sharing options...
NorthWet Posted December 13, 2005 Share Posted December 13, 2005 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. Quote Link to comment Share on other sites More sharing options...
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