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- Path: sparky!uunet!news.tek.com!shaman!mithril.wv.tek.com!harmons
- From: harmons@mithril.wv.tek.com (Harmon Sommer)
- Newsgroups: rec.autos.tech
- Subject: Water Injection
- Message-ID: <2114@shaman.wv.tek.com>
- Date: 7 Nov 92 22:51:51 GMT
- Sender: news@shaman.wv.tek.com
- Reply-To: harmons@mithril.wv.tek.com (Harmon Sommer)
- Distribution: usa
- Lines: 22
-
- Reference is Turbocharging by McInnes.
-
- He shows graph and data from work by Ricardo in the '30s where an engine
- was run 10% lean and manifold pressure (boost) was increased until the
- onset of detonation. Brake Mean Effective Pressure (BMEP) was 168psi and
- Specific Fuel Consumption (SFC) was 0.4lb/bhp_hour.
-
- The mixture and boost were increased until a BMEP of 237psi was attained and
- further enrichment would not allow more boost to be used. SFC was
- 0.6lb/bhp_hour.
-
- Water injection was started and fuel mixture decreased as boost was increased
- even more. The next limit was at BMEP of 290psi; SFC was 0.45lb/bhp_hr and
- water consumption was 0.35lb/bhp_hour.
-
- Going from a lean to rich mixture with boost increased power by 41%.
-
- Going from a lean mixture to slightly richer mixture with water injection
- and boost increased power by 72%
-
- The power required for the supercharger was not taken into consideration.
- For a turbocharger this is probably free.
-