blowby


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blowby

[′blō‚bī]
(mechanical engineering)
Leaking of fluid between a cylinder and its piston during operation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

blowby

The loss of pressure in the cylinder of a reciprocating engine resulting from the leakage of burned gases past the piston rings.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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Looking only at the single-cylinder lab engine (CLR) tests using aircraft oil and ZMax (AvBlend), however, still shows 17-percent reduction in blowby, a six-percent reduction in piston-skirt wear, a two-percent reduction in exhaust-valve wear, and about an 8.5-percent gain in power and efficiency.