Talk:Hemispherical combustion chamber

message: I recall reading (somewhere...) of a French-built, Chrysler-designed hemi, around 130ci, intended for armored cars or something in France in the '40s, being sold in SAm (Brazil?) into the '70s... Can anybody substantiate?  TREKphiler hit me ♠  02:48, 7 February 2009 (UTC)
thread_title: French hemi?

message: I am not knowledgeable enough about this subject to write about it, but I would like to suggest how the lead section could be improved.  I think that is should mention what the hemi design is an alternative to . It should also explain if it is a relatively uncommon design; maybe something like "In 2012 hemi engines were used in only 2% of new cars". Some of these things may be covered in more detail later on in the article, but I think the lead should provide some basic context for the casual reader. ike9898 (talk) 15:38, 23 July 2012 (UTC)
thread_title:  Possible improve to lead section 

message: As the Hemi is talking about a specific type of engine which is used in specific cars and advertised as a recognizable name, I expected the benefits and drawbacks section to discuss the benefits and drawbacks of the hemisphere design compared to other, more conventional designs. Instead, it only talks about the pros and cons of variants on the engine, with a slight section talking about weight and how they have fallen out of favor. However, the new Dodge Durango is advertised as having a HEMI option so it still seems to have some favor.
::Whoever wrote the Benefits and Drawbacks section studied English as a 47th language.  I'd clean it up, but I have no idea what meaning it intends to convey. --76.21.157.203 (talk) 19:00, 27 September 2014 (UTC)
replies: text: if a hemispherical combustion chamber can't have four vpc then the examples cited such as the 1912 GP Peugeot can't have had hemispeherical combustion chambers.  Either than or there CAN be 4-valve hemispherical combustion chambers, coz they can't both be right. Mr Larrington (talk) 12:53, 13 October 2014 (UTC)
replies: text: Well, strictly speaking, you could develop a true 4-valve hemi, but (to my knowledge) no one has done so (due to the valvetrain complexity that would be required).  The 4-valve examples cited in the ′History′ section do not have hemispherical combustion chambers, and their inclusion there is egregiously misleading—but it looks like last time someone tried to correct that, their correction was almost immediately undone.  Jelliott4 (talk) 00:14, 28 October 2014 (UTC)
thread_title:  Benefits and drawbacks improvements 

message: The article states that the design of a hemispherical combustion chamber only allows 2 valves per chamber, but in the history there is mention of a 4 valve engine.
One of these statements is inaccurate.  — Preceding unsigned comment added by 50.121.72.11 (talk) 18:50, 1 June 2015 (UTC)
thread_title:  2 valve - 4 valve innacuracy 

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thread_title:  External links modified 

message: Why are only autos mentioned here? Hemis have been used in recip aircraft emgines almost from day one. They are essential for high power to weight.
Also, all motorcycles use a hemi or pentroof (derivation.) Harley since 1937; almost all makes at least since the 'thirties. Indian was only notable exception. Harley stopped producing flatheads in what 1964 I believe.
Also Boats. Many use Hemis in 4 stroke applications--PT boats used 3 V12 Allison aircraft engines,  again,  hemis.  — Preceding unsigned comment added by 184.99.135.215 (talk) 13:53, 26 April 2017 (UTC)
thread_title:  Aircraft? 

message: Why aren't the 136ci Brazilian SIMCA hemis (based on the flatty) mentioned?  TREKphiler any time you're ready, Uhura 05:25, 11 December 2017 (UTC)
thread_title:  A Simca plan