<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>andyrebele</author><text>This is not 2-stroke. This is 4-stroke engines. There are no catalytic converters on marine outboard motors, so the 4-strokes are allowed to be &amp;gt; 100X as polluting as cars.</text><parent_chain><item><author>ajross</author><text>What this article is really saying is &amp;quot;Two stroke engines are outrageously nasty&amp;quot;.  Which we knew.  They really are dozens of times worse for immediate pollutants (soot&amp;#x2F;particulates, hydrocarbons, NOx) than a routine car engine and catalytic converter.  And they&amp;#x27;re significantly less efficient, so even their CO2 output is quite a bit higher than a gas engine of the same power.&lt;p&gt;But they&amp;#x27;re a tiny market and no one has bothered to try to regulate it.  This just isn&amp;#x27;t a big thing from a save-the-planet perspective.  But it&amp;#x27;s a nifty product.</text></item></parent_chain></comment><story><title>Reducing pollution from boats by switching to electric motors</title><url>https://www.purewatercraft.com/a-thousand-cars-off-the-road/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>jimmaswell</author><text>Is 2 stroke really that common for personal-use boats? I&amp;#x27;ve only heard of them running on 93 gas, which is all I see sold at marinas, no oil to mix in.</text><parent_chain><item><author>ajross</author><text>What this article is really saying is &amp;quot;Two stroke engines are outrageously nasty&amp;quot;.  Which we knew.  They really are dozens of times worse for immediate pollutants (soot&amp;#x2F;particulates, hydrocarbons, NOx) than a routine car engine and catalytic converter.  And they&amp;#x27;re significantly less efficient, so even their CO2 output is quite a bit higher than a gas engine of the same power.&lt;p&gt;But they&amp;#x27;re a tiny market and no one has bothered to try to regulate it.  This just isn&amp;#x27;t a big thing from a save-the-planet perspective.  But it&amp;#x27;s a nifty product.</text></item></parent_chain></comment><story><title>Reducing pollution from boats by switching to electric motors</title><url>https://www.purewatercraft.com/a-thousand-cars-off-the-road/</url></story>