> On 9/28/07, archer <[EMAIL PROTECTED]> wrote: >> GM built a small car; I forget its name; which had aluminum >> blocks/heads made of high silicon aluminum IIRC. The high silicon >> aluminum >> cylinder walls were supposed to wear well but they didn't. > > Wasn't that the Vega? BMW had the same problem with the 3-liter and > 4-liter V-8s in '94 and '95 5-series and 7-series cars. Never heard > of any head problems with those, but many people got a free short > block under an extended warranty (with redesigned cylinder liners made > of a new, improved alloy). ----------------------------- I think that was the Vega. It seems like GM installed steel liners in the Vega engines as a fix. Steel can be heat-treated to take the stresses out of forgings and molded parts but I've forgotten whether aluminum and cast iron can be heat-treated. It would seem like heat-treating aluminum heads (if that's possible) would decrease the likelyhood of cracking. Gerry
_______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
