| April/May 1989

Compression stage stroke as piston rises

Steve W. Deutsch

26 Mott Place, Rockaway Boro, New Jersey 07866, Foreword

I have written the following article for the GEM in response to several remarks made by Mr. Wendel in the 'Reflections' column, in particular 23-11-8 and others, as well as having had several discussions with my friends on the subject of 2 stroke (cycle) engine oiling and operations. I, just like the next fellow engine show enthusiast, do not enjoy being 'gassed' and deafened by smoky and noisy 2 cycle engines at a show. However, I realize why these engines run like they do and maybe this article can give some insight and inspiration to both the readers and the people who operate this unique style of engine.

For those of us in 'engine land' who have seen and sat next to a noisy, smoking 2 cycle engine I can offer my sympathy and some advice-don't breathe too deep. All kidding aside, I believe that some etiquette should be observed when running this unique style of engine. Nobody, myself included, likes to listen to a 2 cycle's raspy bark, and smell the exhaust all day long. Anybody who has been next to an open exhaust Fairmont with its 12 to 1 fuel ratio will get a massive dose of what I mean.

I believe in moderation for the operation of my 'smokers' and if more people would show the same consideration a lot of shows would be more enjoyable, both to the exhibitors and the visitors.

First is my choice of a set up area. If I know that it is going to be a windy day, I try to pick a spot down wind from most of the other exhibitors (especially if I run my 'heavy oil burners' which include a 1950 Model 7 H Mall 2 man chain saw @ 12:1, a 1941 Model QBA Fairmont 8 to 13 HP also @ 12:1, and my Maytag Model 92's @ 16:1). I'll go into fuel-oil ratios later in the article.

Second, I try to keep the running time down. Usually I'll only run them for about 5 or 10 minutes at a stretch. At a couple of shows I attended I made up a sign with the time I would be demonstrating a particular piece of equipment. This serves two purposes: it keeps the air pollution (smoke) to a minimum, and helps keep the noise level down. The noise made by an open exhaust will drive me up a wall after about 5 minutes, how about you? With the demonstration times listed, if someone wants to 'hear it run', they can see and hear it go at the same time, and everybody is happy. I also give the engine the once over before I run it to make sure there are no loose items that could cause damage.