Engines-List Digest Archive
Thu 05/14/09 |
Total Messages Posted: 1 |
Today's Message Index: ---------------------- 1. 08:49 PM - Re: Auto Engine - compression ratio vs. octane (DEAN PSIROPOULOS)
Message 1
INDEX Back to Main INDEX NEXT Skip to NEXT Message LIST Reply to LIST Regarding this Message SENDER Reply to SENDER Regarding this Message
Time: 08:49:31 PM PST US
From: "DEAN PSIROPOULOS" <dean.psiropoulos@verizon.net> The big automotive engines of the 1960s took compression ratios to their ultimate state of the art with premium leaded auto gas. Ratios from 10.5 to 11.5 to 1 were common place with 100 octane auto fuel. Since the unleaded mandate, computer analysis has advanced the state of the art in combustion chamber technology so that 9.5 to 1 ratios are possible on regular unleaded fuel (87 octane) without detonation. If you use computerized engine control with knock sensing you could probably go even higher. And with avgas being the equivalent of somewhere around 110 octane autofuel, the sky should be the limit (not quite but it would be an interesting exercise to see how high one could go using a modern auto engine with avgas). Dean Psiropoulos RV-6A N197DM Struggling with erratic idle on 0-360
Subject: Auto Engine - compression ratio vs. octane
Other Matronics Email List Services
Post A New Message    engines-list@matronics.com UN/SUBSCRIBE    http://www.matronics.com/subscription List FAQ    http://www.matronics.com/FAQ/Engines-List.htm Web Forum Interface To Lists    http://forums.matronics.com Matronics List Wiki    http://wiki.matronics.com 7-Day List Browse    http://www.matronics.com/browse/engines-list Browse Engines-List Digests    http://www.matronics.com/digest/engines-list Browse Other Lists    http://www.matronics.com/browse Live Online Chat!    http://www.matronics.com/chat Archive Downloading    http://www.matronics.com/archives Photo Share    http://www.matronics.com/photoshare Other Email Lists    http://www.matronics.com/emaillists Contributions    http://www.matronics.com/contribution
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --