Talk:Hemispherical combustion chamber

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This page is not a forum for general discussion about Hemi engines or engines in general. Any such comments may be removed or refactored. Please limit discussion to improvement of this article. You may wish to ask factual questions about Hemi engines or engines in general at the Reference desk.

Archives of past discussion

Archive 1

Cars

Wich car models used the hemi engine?

French hemi?

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)[reply]

Factually inaccurate disaster

Why all the pent-roof content? A pent-roof combustion chamber is by definition NOT hemispherical. And ironically, Aston Martin engines that actually do have hemispherical combustion chambers aren't mentioned at all. Benefits/drawbacks is incomplete, "Supersession in modern engines" is flawed, many historically/technologically significant hemi engines aren't mentioned, the Lotus section doesn't actually say anything about Lotus's engines, Alfa's 4-cyl hemi (second only to the Jag engine for longevity of production, 1953-1993) isn't mentioned, and the Porsche section erroneously claims that recent 911s utilized hemispherical combustion chambers! And why do these Mitsubishi engines warrant inclusion (has anyone verified that they actually have hemispherical combustion chambers?) when inexpensive 4-cyl pushrod hemis from Renault and Toyota (both of which are arguably of more historical/technological significance on account of racing victories) are omitted? Good grief. Jelliott4 (talk) 15:10, 14 November 2010 (UTC)[reply]

Thank you for your suggestion. When you believe an article needs improvement, please feel free to make those changes. Wikipedia is a wiki, so anyone can edit almost any article by simply following the edit this page link at the top. The Wikipedia community encourages you to be bold in updating pages. Don't worry too much about making honest mistakes—they're likely to be found and corrected quickly. If you're not sure how editing works, check out how to edit a page, or use the sandbox to try out your editing skills. New contributors are always welcome. You don't even need to log in (although there are many reasons why you might want to). Wikipedia has this cool idea...if you see a problem, fix it. As to pentroof chambers being hemis or not; when Mopar was developing its DOHC "hemi", it called the four valve pentroofed heads "hemi pentroof" chambers (according to a 1967 "Mopar Muscle" article)

I don't know that a sentence and a picture is all that much content. And it shows the evolution of the hemi chamber. A pentroof is a cross-flow head, just like a hemi and the only reason it isn't a true hemispherical combustion chamber is because it has 4 flat-headed valves in each ""corner"".

If you think benefits/drawbacks is incomplete, complete it to your satisfaction. Same goes for fleshing out the Lotus, Alfa and any other manufacturers you may want to add to the list.

I believe the concept here is for everyone to add their bit. It sounds like you have some bits to add, so go to it.Marshmallowbunnywabbit (talk) 01:03, 30 November 2010 (UTC)[reply]

"Today,"hemi" is more of a trademark than a description of a combustion chamber." It's either a trademark, or it's not. Let's not use the term 'trademark', which has a particular legal meaning, to mean 'characteristic term'. — Preceding unsigned comment added by 207.189.106.4 (talk) 17:36, 15 June 2012 (UTC)[reply]