Author |
Message |
Topic: Lousy Lycomings! |
tmcdaid
Replies: 9
Views: 14724
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Forum: Recip Engines 1920=> Posted: Thu Dec 22, 2005 18:21 Subject: Lousy Lycomings! |
Not particularly to defend Lycoming, but I'd like to share a thought on the topic. I note that Herschel Smith, in his book A History Of Aircraft Piston Engines complains several times that more moder ... |
Topic: TEL & exhaust valve lubrication - Urban myth or serendip |
tmcdaid
Replies: 6
Views: 11002
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Forum: Technical Discussion Posted: Thu Dec 22, 2005 17:52 Subject: TEL & exhaust valve lubrication - Urban myth or serendip |
Lots of good info in the answers.com link. Thanks!
I recall from the leaded gas days that spark plugs would acquire white or gray deposits, presumably largely lead oxide which we don't see in engi ... |
Topic: A question about manifold pressure |
tmcdaid
Replies: 6
Views: 15401
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Forum: Collections/Restorations - General Posted: Tue Dec 14, 2004 17:32 Subject: A question about manifold pressure |
An acceptable approximation in many cases is that 1 psi is approximately equal to 2" Hg and (the old math teacher in me shudders). While Kim's numbers above are much more accurate, very roughly, stan ... |
Topic: Questions re: Continental XR-794 Sleeve Valve |
tmcdaid
Replies: 7
Views: 13793
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Forum: Recip Engines 1920=> Posted: Sun May 23, 2004 15:13 Subject: Questions re: Continental XR-794 Sleeve Valve |
Sorry for the math error; my question was posted late at night. Nonetheless, for a poppet-valve engine 320 degrees would be tremendously long opening duration. Kimble's comment about the piston havi ... |
Topic: Questions re: Continental XR-794 Sleeve Valve |
tmcdaid
Replies: 7
Views: 13793
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Forum: Recip Engines 1920=> Posted: Thu May 13, 2004 22:17 Subject: Questions re: Continental XR-794 Sleeve Valve |
Out of curiosity, is that somewhat typical timing for a sleeve-valve engine? The exhaust duration of 340 degrees seems huge, especially for a relatively low-RPM engine. |
Topic: V-1710-111/113 power potential with ADI |
tmcdaid
Replies: 3
Views: 8559
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Forum: Allison Engines Posted: Thu May 13, 2004 22:10 Subject: V-1710-111/113 power potential with ADI |
Excellent point. Although, what about the diameter of the props? I haven't found anything specific about the prop size on the 38, but I did find vague references that suggest the later 47s had a 13' ... |
Topic: V-1710-111/113 power potential with ADI |
tmcdaid
Replies: 3
Views: 8559
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Forum: Allison Engines Posted: Fri Apr 23, 2004 20:28 Subject: Re: No Paddle Props on P-38s |
Is it because the the V1710s had significantly less power under normal operating conditions than the R2800s? From what I've read, without the paddle blades, the R2800s were somewhat overpowering the ... |
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