What is involved in making a internal combustion ( gasoline or diesel ) engine with '"n" cylinders operate on "n" divided by two cylinders ? Does one just turn off the injectors ? Are there other requirements ? Does one vary the cylinder usage to reduce noise and wear ? Can a DIY meddler attempt such a project on a 1997 8 cylinder gasoline fueled SUV ? What are the fuel saving ramifications ? Ideally I would like to drive around on "4" cylinders and switch to "8" cylinders to pull a trailer. MA WFT Electronics Denver, CO 720 222 1309 " dent the UNIVERSE " All ideas, text, drawings and audio , that are originated by WFT Electronics ( and it's principals ), that are included with this signature text are to be deemed to be released to the public domain as of the date of this communication . -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist