Talk:Harley-Davidson Evolution engine

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About the Evolution being a betrayal - is it as simple as the engine was easy to maintain, and therefore served the less mechanically-inclined? I thought some of the issue was also that it lost its maintainability. I'm thinking along the lines of the one-piece crank here. We don't seem to have any sources on this...maybe we should make a new section (suggest title "Reception") and cover the POVs on the controversy? – usigned edit by

This sounds like a great idea. The article is sourceless as of my writing, so any sources would be an improvement. It makes sense that improvements to make it more maintainable for novices may have also made the engine more expert-hostile than the Shovelhead. Culturally, however, there is definitely an element of the Evolution being "ruined cause it is too popular". –BozoTheScary 21:33, 27 March 2007 (UTC)

Presumed ills of water-cooled engines.[edit]

I removed, from the article's third paragraph, the following statement: "In water-cooled vehicles the oil and water will often mix and contribute to lubrication failure and engine destruction."

It is true that water-cooled engines (I presume the writer intended "engines" rather than "vehicles.") occasionally suffer from mixture of oil and water mixture--usually due to the failure of a gasket or seal, less commonly due to cylinder block or head failure. However the statement that I removed is simply not supported by any facts of which I'm aware.

For more than a few years, there has been on our planet a quite sizable number of vehicles with water-cooled engines. I think it safe to say that the proportion of water-cooled engines versus air-and-oil-cooled engines used in car and motorcycle applications has generally been on the rise for several decades. Despite the large and increasing prevalence of water-cooled engines in vehicles, oil and water mixture is uncommon even in vehicles that are not closely maintained.

I've searched for but am unable to find a citation detailing the absolute or relative numbers of oil and water mixture problems in water-cooled vehicle engines. I spent the better part of twenty years working in the commercial auto parts business (roughly 1978 to 1987) and many more years working on motor vehicle engines of various sorts, so am relying on my own familiarity with the subject and on the large and increasing adoption of water-cooling technology for vehicle engines around the world. Tmelinaraab (talk) 22:26, 26 January 2012 (UTC)


Deleted "to 2000" in the production section as the Evolution engine is STILL produced in the 883 and 1200 cc displacements mounted on the Sportster models. — Preceding unsigned comment added by (talk) 11:29, 4 April 2013 (UTC)

IMO, having worked on, run shops, designed parts for and currently being in the field of Harley mechanics for more than 20 years, rather than removing "to 2000" it might have been better to stipulate "to 2000 for Big Twin". It may just be my opinion but I feel it would also be the generally accepted opinion of most people "in the business" that the word "EVO" would refer to the Big Twin and the "Sportster EVO" would be different. Again, EVO being produced from 1984 in the first Softails and replacing the Shovelhead in the rubber mounted models (FXR and FLT's) and used in general production until 2000 in the FXR4 CVO model. There might be some dispute as to the FXR4 being a limited production run versus a regular production model however that does not take away from the fact that a 2000 FXR4 does have an EVO engine in it. I am not sure how to reference a source but I would reference the Factory Service Manuals for all dates and models suggested above. Fxsspringer (talk) 14:35, 4 August 2014 (UTC)