Path: utzoo!attcan!uunet!know!sdd.hp.com!wuarchive!emory!att!cbnews!cbnews!military From: ntaib@silver.ucs.indiana.edu (Nur Iskandar Taib) Newsgroups: sci.military Subject: Re: Oil Dilution Systems. Message-ID: <1990Oct25.150416.808@cbnews.att.com> Date: 25 Oct 90 15:04:16 GMT References: <1990Oct11.051057.29887@cbnews.att.com> <1990Oct19.032736.13097@cbnews.att.com> <1990Oct23.010029.3371@cbnews.att.com> <1990Oct24.115220.4396@cbnews.att.com> Sender: military@cbnews.att.com (William B. Thacker) Organization: Indiana University, Bloomington IN. Lines: 38 Approved: military@att.att.com From: ntaib@silver.ucs.indiana.edu (Nur Iskandar Taib) > Hmm, how long do 2-stroke engines last compared to 4-stroke engines >of the same horsepower in similar use? I.e., lawnmowers vs lawnmowers or >outboard motors vs outboard motors? The guarantee that came with my new >mower implies that it will last longer than the old one. Well, provided you don't run them lean or with too little oil, 2 cycle engines will last a long time. They aren't very effi- cient, as they lose part of the intake charge out the exhaust port, but they have few parts to break compared to four cycles. On another vein: I've heard of two stroke airplane engines. In particular, some of the late WW2 (or early post-war) high per- formance engines were supposedly two cycles. Does anyone know which ones in particular were? I also recall (vaguely) an H-shaped engine (really two engines side-by-side, each with two vertically opposed banks of cylinders) that was supposedly used in the very last test models of Mustang (never went into service). This engine supposedly packed more displacement into as small a cross-section as possible. I THINK it was a two cycle too, but... this was years and years ago and I haven't come across any- thing about it since. ------------------------------------------------------------------------------- Iskandar Taib | The only thing worse than Peach ala Internet: NTAIB@AQUA.UCS.INDIANA.EDU | Frog is Frog ala Peach Bitnet: NTAIB@IUBACS !